This document discusses filtration and cake filtration principles. It begins by defining filtration and the mechanisms involved. It describes cake filters and how a filter cake forms on the filter medium. The key principles of cake filtration are that resistance increases over time as the cake builds up, requiring either decreasing flow rate or increasing pressure drop to maintain flow. The pressure drop comes from both the filter medium and the cake. Parameters like flow rate, pressure drop, and cake thickness are important to cake filtration.
Batch sedimentation
What is sedimentation…?
Goals of gravity s sedimentation
Applications of sedimentation
zone settling velocity
Factors affecting zone settling velocity
Design of Zone Settling Tanks
What is Thickener and Clarifiers…?
Thickener Area Calculation
Types of clarifier
Presentation on mechanical vapor recompressor evaporator (mvre)AmreetOjha
Presentation on Mechanical Vapour Recompressor Evaporator (MVRE)
Description about Evaporator
Type Of Evaporators
About MVR
Types of MVRE
Thermodynamics of MVRE
Working of MVRE
Separation, screening and classificationWaqas Ahmed
This document discusses separation techniques used to separate materials. It describes two main types of separation: diffusional separation which separates homogeneous mixtures using processes like distillation or crystallization, and mechanical separation which separates heterogeneous mixtures based on physical properties like size, shape or density. Mechanical separation includes classification, which separates solids from liquids/gases, and screening, which separates solids from solids based solely on particle size using screens of different mesh sizes. The document provides details on screen construction, standard screen sizes, material flow calculations, and factors affecting screening effectiveness.
This document discusses various types of equipment used for mass transfer operations in industry. It describes plate columns and packed columns as the two most widely used for distillation, gas absorption, and stripping. Plate columns are also known as tray columns, where the column is divided into stages by trays. The main types of trays are sieve, bubble-cap, and valve trays. Packed columns can use random, structured, or grid packings. Other equipment discussed include bubble columns, spray columns, and agitated vessels. Selection of mass transfer equipment depends on the process conditions and economics.
Filter press and shell and leaf filtersKarnav Rana
This document discusses different types of industrial filtration equipment, including plate and frame filter presses and shell and leaf filters. Plate and frame filter presses operate in batches, using increased pressure to maximize filtration rates. They consist of alternating plates and frames that form chambers for filter cakes. Shell and leaf filters use a set of vertical leaves in a horizontal tank, applying pressure to force slurry through the leaves, leaving filter cake on the outside. They provide a large surface area and are suitable for filtrations requiring filter aids.
The document discusses cyclonic separators and hydrocyclones. Cyclonic separators use centrifugal force to separate particulate matter from gas streams. Gas enters tangentially and spins rapidly, forcing particles outward against the wall to fall into a collection hopper while clean gas exits through the center. Hydrocyclones separate particles in liquid suspensions based on density and size differences, with denser/coarser particles exiting the bottom and lighter/finer through the top. Both devices have various industrial uses like dust collection and mineral processing.
Types of Distillation & column internalsBharat Kumar
More:- https://chemicalengineeringworld.com
Distillation is a method of separating the components of a solution which depends upon distribution of the substances between a gas and liquid phase, applied to cases where all components are present in both phases.
* What is distillation ?
* Types of Distillation
* Batch Distillation
* Azeotropic Distillation
* Flooding
* Priming
* Coning
* Weeping
* Dumping
* Packed Column
* Tray column
* Reflux Ratio
* Relative volatility
* Distillation column
Distillation is a method of separating mixtures based on differences in volatility (volatility is the tendency of a substance to vaporize. Volatility is directly related to a substance's vapor pressure.) of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction
Batch sedimentation
What is sedimentation…?
Goals of gravity s sedimentation
Applications of sedimentation
zone settling velocity
Factors affecting zone settling velocity
Design of Zone Settling Tanks
What is Thickener and Clarifiers…?
Thickener Area Calculation
Types of clarifier
Presentation on mechanical vapor recompressor evaporator (mvre)AmreetOjha
Presentation on Mechanical Vapour Recompressor Evaporator (MVRE)
Description about Evaporator
Type Of Evaporators
About MVR
Types of MVRE
Thermodynamics of MVRE
Working of MVRE
Separation, screening and classificationWaqas Ahmed
This document discusses separation techniques used to separate materials. It describes two main types of separation: diffusional separation which separates homogeneous mixtures using processes like distillation or crystallization, and mechanical separation which separates heterogeneous mixtures based on physical properties like size, shape or density. Mechanical separation includes classification, which separates solids from liquids/gases, and screening, which separates solids from solids based solely on particle size using screens of different mesh sizes. The document provides details on screen construction, standard screen sizes, material flow calculations, and factors affecting screening effectiveness.
This document discusses various types of equipment used for mass transfer operations in industry. It describes plate columns and packed columns as the two most widely used for distillation, gas absorption, and stripping. Plate columns are also known as tray columns, where the column is divided into stages by trays. The main types of trays are sieve, bubble-cap, and valve trays. Packed columns can use random, structured, or grid packings. Other equipment discussed include bubble columns, spray columns, and agitated vessels. Selection of mass transfer equipment depends on the process conditions and economics.
Filter press and shell and leaf filtersKarnav Rana
This document discusses different types of industrial filtration equipment, including plate and frame filter presses and shell and leaf filters. Plate and frame filter presses operate in batches, using increased pressure to maximize filtration rates. They consist of alternating plates and frames that form chambers for filter cakes. Shell and leaf filters use a set of vertical leaves in a horizontal tank, applying pressure to force slurry through the leaves, leaving filter cake on the outside. They provide a large surface area and are suitable for filtrations requiring filter aids.
The document discusses cyclonic separators and hydrocyclones. Cyclonic separators use centrifugal force to separate particulate matter from gas streams. Gas enters tangentially and spins rapidly, forcing particles outward against the wall to fall into a collection hopper while clean gas exits through the center. Hydrocyclones separate particles in liquid suspensions based on density and size differences, with denser/coarser particles exiting the bottom and lighter/finer through the top. Both devices have various industrial uses like dust collection and mineral processing.
Types of Distillation & column internalsBharat Kumar
More:- https://chemicalengineeringworld.com
Distillation is a method of separating the components of a solution which depends upon distribution of the substances between a gas and liquid phase, applied to cases where all components are present in both phases.
* What is distillation ?
* Types of Distillation
* Batch Distillation
* Azeotropic Distillation
* Flooding
* Priming
* Coning
* Weeping
* Dumping
* Packed Column
* Tray column
* Reflux Ratio
* Relative volatility
* Distillation column
Distillation is a method of separating mixtures based on differences in volatility (volatility is the tendency of a substance to vaporize. Volatility is directly related to a substance's vapor pressure.) of components in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction
Distillation is a method of separating mixtures based on differences in their volatilities through boiling and condensation. Key points:
- It involves heating a mixture to vaporize more volatile components, cooling to condense the vapor into separate products.
- Common uses include separating crude oil, purifying water and air, producing alcoholic beverages.
- Types include simple, fractional, flash, and vacuum distillation. Flash distillation partially vaporizes a liquid through pressure reduction.
- Distillation columns contain internals like trays or packings to facilitate vapor-liquid contact during separation. Fractional distillation uses multiple equilibrium stages for high purity products.
This document provides an introduction to a course on particle technology. It discusses key topics that will be covered, including characterization of solid particles by size, shape, and density. Particle size is an especially important property, as it influences many material behaviors. Size can be analyzed through techniques like screen analysis to determine distributions. Average particle sizes are defined in several ways. The course will also cover topics like particle motion, separation methods, and more.
The document provides an overview of unit operations in chemical engineering. It defines unit operations as basic steps that involve physical changes like separation, crystallization, evaporation. Examples of common unit operations are given like heat transfer, evaporation, drying, absorption. Different types of unit operations are classified. Key aspects of specific unit operations like heat transfer, drying, evaporation and distillation are described in further detail. The document highlights the importance of understanding the physical laws governing each unit operation for effective analysis and design of chemical processes.
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
This document discusses a project on studying the steam economy of a multiple effect evaporator plant that produces sodium sulfate. It is a report submitted by 4 students to fulfill their Bachelor of Engineering degree requirements. The project aims to determine why steam utility increases over time in the plant's multiple effect evaporator for sodium sulfate production and find a suitable solution to reduce it. It will also involve simulating the multiple effect evaporator process using Excel. The document provides background on evaporators, multiple effect evaporators, sodium sulfate and its applications.
The document discusses agitator design and selection. It describes single duty agitators that provide either flow or shear, and multi-duty agitators. The selection of impeller type, diameter, and speed depends on the process requirements. Impeller options include axial flow, radial flow, and combinations. Proper agitator design also considers mechanical design aspects like power requirement, shaft, and seals. A universal mixer is described that can handle a wide range of mixing duties through adjustable flow and shear.
This document provides an outline for a course on thermal unit operations. It begins with definitions of unit operations and thermal unit operations. The three main mechanisms of heat transfer are then described: conduction, convection, and radiation. Conduction involves heat transfer through direct molecular contact in solids or stationary fluids. Convection uses fluid motion to transfer heat. Radiation transfers heat via electromagnetic waves without a medium. Equations for calculating heat transfer via these different mechanisms are also provided.
This Presentation gives an overview about the multiple effect evaporators. The intention is also focused on designing principles of Single and Multiple Effect Evaporators
This document discusses filtration, which is defined as the separation of solids from liquids by passing the mixture through a porous medium. It describes different types of filtration including surface and depth filtration. Key factors that affect the filtration rate are also outlined. Various filter media are discussed, along with theories of filtration like Poiseuille's equation and Darcy's equation. Finally, common industrial filters used in pharmaceutical industries like filter presses and rotary filters are briefly introduced.
Filtration and drying are critical operations in a variety of industrial processes that require the separation of solid matter from a liquid. Here we list the 7 basic steps what happens during each one.
The document discusses various methods of leaching, which is the process of extracting soluble constituents from a solid material using a liquid solvent. It describes several common leaching techniques used in industries like food processing, pharmaceuticals, and metals extraction. These include counter-current leaching systems that improve extraction efficiency, as well as equipment used for leaching like agitated vessels, thickeners, extractors, and the Kennedy and Bollman extractors.
This document provides an overview of particulate technology, specifically thickeners and clarifiers. It introduces thickeners and clarifiers, explains their working principles, types, and applications. Thickeners are used to separate liquids from solids, increasing the density and concentration of solids, while clarifiers separate solids to purify liquids through sedimentation. Common applications include mining operations, water treatment, and sewage treatment. While thickeners and clarifiers have similar designs, thickeners concentrate solids and clarifiers purify liquids.
This document summarizes flooding in a distillation column. Distillation separates mixtures based on differences in volatility through boiling and vaporization. Flooding occurs when excessive vapor flow carries liquid up the column, reducing efficiency. It can be detected by increases in differential pressure and decreases in separation. The document describes an experiment where a distillation column's reboiler heat was incrementally increased. Measurements from pressure transmitters showed that filtering and monitoring standard deviation of the pressure signal could provide early detection of the column approaching flooding. This allows operators to make adjustments and prevent loss of separation and reduced efficiency.
This document defines evaporator concepts like steam economy, evaporator capacity, and steam consumption. It describes single effect evaporators, where vapor from boiling liquid is condensed and discarded, resulting in low steam economy. Multiple effect evaporators improve steam economy by using vapor from one effect to heat the next. Forward, backward, mixed, and parallel feeding arrangements are described for transferring liquid between multiple effects. Forward feed provides increasing concentration from first to last effect without pumps between effects.
Different settling methods in mechanical operations Jaydrath Sindhav
Its part of sedimentation which is covered under the Mechanical operations. It contains the gravity sedimentation, clarifier and classifiers, sink and float method, gravity and sorting classifiers, differential settling methods etc....
Its just gives basic concept of sedimentation.
Venturi scrubbers are a type of wet scrubber air pollution control device that uses the venturi effect to inject liquid into a high velocity gas stream. They consist of a converging section, throat, and diverging section. Polluted gas enters the converging section and accelerates through the throat where it is mixed with an injected liquid, removing pollutants. Droplets are then separated from the cleaned gas. Venturi scrubbers can effectively remove particles and some gases, have small space needs, and handle high temperature streams, but require high power and can cause corrosion and water disposal issues.
Drying is defined as the removal of water or other liquids from a material through the application of heat. It involves three steps: heat transfer to the material, mass transfer of moisture to the surface and evaporation, and transfer of vapor away from the material. There are several theories that describe the drying mechanism, including diffusion, capillarity, and pressure gradient theories. The drying rate curve shows an initial adjustment period, constant rate period, falling rate periods, and an equilibrium moisture content where drying stops. Factors like material properties, air conditions, and particle size influence the drying process and rate.
Membranes have been used for separations since the 18th century, with significant developments in the 20th century. They are semi-permeable barriers that selectively restrict the transport of molecules. Key membrane processes include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, gas separation, and pervaporation. Membranes are used in modules and the selection of module depends on factors like membrane area, costs, and fouling control. While membranes offer advantages like mild operating conditions, challenges include membrane fouling and costs.
wholw Content is covered in this presentation .it will give u a basic idea and types about leaching and it will also provide u information via Diagrams .
Distillation is a method of separating mixtures based on differences in their volatilities through boiling and condensation. Key points:
- It involves heating a mixture to vaporize more volatile components, cooling to condense the vapor into separate products.
- Common uses include separating crude oil, purifying water and air, producing alcoholic beverages.
- Types include simple, fractional, flash, and vacuum distillation. Flash distillation partially vaporizes a liquid through pressure reduction.
- Distillation columns contain internals like trays or packings to facilitate vapor-liquid contact during separation. Fractional distillation uses multiple equilibrium stages for high purity products.
This document provides an introduction to a course on particle technology. It discusses key topics that will be covered, including characterization of solid particles by size, shape, and density. Particle size is an especially important property, as it influences many material behaviors. Size can be analyzed through techniques like screen analysis to determine distributions. Average particle sizes are defined in several ways. The course will also cover topics like particle motion, separation methods, and more.
The document provides an overview of unit operations in chemical engineering. It defines unit operations as basic steps that involve physical changes like separation, crystallization, evaporation. Examples of common unit operations are given like heat transfer, evaporation, drying, absorption. Different types of unit operations are classified. Key aspects of specific unit operations like heat transfer, drying, evaporation and distillation are described in further detail. The document highlights the importance of understanding the physical laws governing each unit operation for effective analysis and design of chemical processes.
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
This document discusses a project on studying the steam economy of a multiple effect evaporator plant that produces sodium sulfate. It is a report submitted by 4 students to fulfill their Bachelor of Engineering degree requirements. The project aims to determine why steam utility increases over time in the plant's multiple effect evaporator for sodium sulfate production and find a suitable solution to reduce it. It will also involve simulating the multiple effect evaporator process using Excel. The document provides background on evaporators, multiple effect evaporators, sodium sulfate and its applications.
The document discusses agitator design and selection. It describes single duty agitators that provide either flow or shear, and multi-duty agitators. The selection of impeller type, diameter, and speed depends on the process requirements. Impeller options include axial flow, radial flow, and combinations. Proper agitator design also considers mechanical design aspects like power requirement, shaft, and seals. A universal mixer is described that can handle a wide range of mixing duties through adjustable flow and shear.
This document provides an outline for a course on thermal unit operations. It begins with definitions of unit operations and thermal unit operations. The three main mechanisms of heat transfer are then described: conduction, convection, and radiation. Conduction involves heat transfer through direct molecular contact in solids or stationary fluids. Convection uses fluid motion to transfer heat. Radiation transfers heat via electromagnetic waves without a medium. Equations for calculating heat transfer via these different mechanisms are also provided.
This Presentation gives an overview about the multiple effect evaporators. The intention is also focused on designing principles of Single and Multiple Effect Evaporators
This document discusses filtration, which is defined as the separation of solids from liquids by passing the mixture through a porous medium. It describes different types of filtration including surface and depth filtration. Key factors that affect the filtration rate are also outlined. Various filter media are discussed, along with theories of filtration like Poiseuille's equation and Darcy's equation. Finally, common industrial filters used in pharmaceutical industries like filter presses and rotary filters are briefly introduced.
Filtration and drying are critical operations in a variety of industrial processes that require the separation of solid matter from a liquid. Here we list the 7 basic steps what happens during each one.
The document discusses various methods of leaching, which is the process of extracting soluble constituents from a solid material using a liquid solvent. It describes several common leaching techniques used in industries like food processing, pharmaceuticals, and metals extraction. These include counter-current leaching systems that improve extraction efficiency, as well as equipment used for leaching like agitated vessels, thickeners, extractors, and the Kennedy and Bollman extractors.
This document provides an overview of particulate technology, specifically thickeners and clarifiers. It introduces thickeners and clarifiers, explains their working principles, types, and applications. Thickeners are used to separate liquids from solids, increasing the density and concentration of solids, while clarifiers separate solids to purify liquids through sedimentation. Common applications include mining operations, water treatment, and sewage treatment. While thickeners and clarifiers have similar designs, thickeners concentrate solids and clarifiers purify liquids.
This document summarizes flooding in a distillation column. Distillation separates mixtures based on differences in volatility through boiling and vaporization. Flooding occurs when excessive vapor flow carries liquid up the column, reducing efficiency. It can be detected by increases in differential pressure and decreases in separation. The document describes an experiment where a distillation column's reboiler heat was incrementally increased. Measurements from pressure transmitters showed that filtering and monitoring standard deviation of the pressure signal could provide early detection of the column approaching flooding. This allows operators to make adjustments and prevent loss of separation and reduced efficiency.
This document defines evaporator concepts like steam economy, evaporator capacity, and steam consumption. It describes single effect evaporators, where vapor from boiling liquid is condensed and discarded, resulting in low steam economy. Multiple effect evaporators improve steam economy by using vapor from one effect to heat the next. Forward, backward, mixed, and parallel feeding arrangements are described for transferring liquid between multiple effects. Forward feed provides increasing concentration from first to last effect without pumps between effects.
Different settling methods in mechanical operations Jaydrath Sindhav
Its part of sedimentation which is covered under the Mechanical operations. It contains the gravity sedimentation, clarifier and classifiers, sink and float method, gravity and sorting classifiers, differential settling methods etc....
Its just gives basic concept of sedimentation.
Venturi scrubbers are a type of wet scrubber air pollution control device that uses the venturi effect to inject liquid into a high velocity gas stream. They consist of a converging section, throat, and diverging section. Polluted gas enters the converging section and accelerates through the throat where it is mixed with an injected liquid, removing pollutants. Droplets are then separated from the cleaned gas. Venturi scrubbers can effectively remove particles and some gases, have small space needs, and handle high temperature streams, but require high power and can cause corrosion and water disposal issues.
Drying is defined as the removal of water or other liquids from a material through the application of heat. It involves three steps: heat transfer to the material, mass transfer of moisture to the surface and evaporation, and transfer of vapor away from the material. There are several theories that describe the drying mechanism, including diffusion, capillarity, and pressure gradient theories. The drying rate curve shows an initial adjustment period, constant rate period, falling rate periods, and an equilibrium moisture content where drying stops. Factors like material properties, air conditions, and particle size influence the drying process and rate.
Membranes have been used for separations since the 18th century, with significant developments in the 20th century. They are semi-permeable barriers that selectively restrict the transport of molecules. Key membrane processes include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, gas separation, and pervaporation. Membranes are used in modules and the selection of module depends on factors like membrane area, costs, and fouling control. While membranes offer advantages like mild operating conditions, challenges include membrane fouling and costs.
wholw Content is covered in this presentation .it will give u a basic idea and types about leaching and it will also provide u information via Diagrams .
Mechanical separations methods include sieves or membranes that retain one component while allowing another to pass. Screening separates particles based on size alone using screens with different sized openings. The efficiency and capacity of a screen involves balancing how well it separates materials versus the mass it can process. Filtration separates solids from liquids by passing a suspension through a permeable filter medium, with different mechanisms including surface filtration that forms a filter cake and depth filtration within the filter medium.
Filtration is a process used to separate solids from liquids by passing the mixture through a porous medium that retains the solids. There are several mechanisms and theories that describe how filtration works, including straining, impingement, and Poiseuille's equation which relates flow rate to pressure difference, resistance, and other factors. Common types of filtration include surface filtration and depth filtration. Key filtration equipment includes plate and frame filters, filter leaves, and cartridge filters, which separate solids using pressure or vacuum and provide advantages like large processing areas and efficient washing.
Filtration is a process used to separate solids from liquids by passing the mixture through a porous medium that retains the solids. Clarification is filtration used when solids are present at low concentrations (<1.0% w/v) and the filtrate is the primary product. Filtration is used in pharmaceutical manufacturing for processes like sterile production, bulk drug recovery, liquid dosage improvement, and effluent/waste treatment. Key mechanisms of filtration include straining, impingement, entanglement, and attractive forces. Common filter media include membranes, woven materials, non-woven materials, and cartridges. Filter aids like diatomaceous earth are sometimes used to improve filtration efficiency and rate. Common filtration equipment
The document discusses various filtration techniques used in pharmaceutical processing. It defines filtration as the removal of solids from fluids or fluids from other fluids. Clarification can be achieved through filtration or centrifugation. There are two main reasons for these processes in pharmaceuticals: to remove unwanted particles and to collect solids as the final product. The document describes various types of filtration like solid/fluid, solid/gas, fluid/fluid filtration and their applications. It also discusses filtration theory, factors affecting filtration rate, various filter media types, filter aids, selection of filtration equipment and systems for different applications.
Filtration is commonly the mechanical or physical operation which is used for the separation of products like solids from fluids by interposing a medium through which only the fluid can pass.
Filtrasi is a separation method used to separate solid particles suspended in a fluid by passing the fluid through a porous medium that retains the solid particles. During filtration, the solid particles accumulate on the filter medium forming a filter cake that increases in thickness and resistance over time. There are different types of filtration equipment that operate using different principles like pressure, vacuum, or gravity depending on the application and amount of material being filtered. Common applications of filtration include separating brewed coffee from grounds using a paper filter, removing dust and particles from air using HEPA filters, and purifying water and sewage at municipal treatment plants.
This document discusses various concepts in fluid filtration, including:
- General definitions of filtration terms and classifications including by driving force, filtration mechanism, objective, operating cycle, and nature of solids.
- Strainers including area-type (wire mesh, metal screen, porous metal/non-metallic filters) and edge-type (metallic or paper disk elements)
- Paper or fabric filters including extended area pleated paper elements and their uses and limitations.
- Depth filters which rely on a porous material mass and can include absorbent or adsorbent effects in addition to mechanical blocking/straining.
- Absorbent filters which remove coarser and finer contaminants through
Filtration is a process used to separate solids from liquids by passing the mixture through a porous medium that retains the solids. There are two main types - surface filtration and depth filtration. Filtration finds applications in producing sterile products, pharmaceuticals, and wastewater treatment. Key factors that influence filtration include properties of the solid, liquid, and slurry as well as temperature. Selection of the appropriate filter depends on the fluid properties, solid properties, concentration, flow rate, and sterilization needs.
The studies influence techniques of filtration, its various types, and theories involved in the rate of filtration. This topic useful for physical pharmacy students and other concerned with filtration.
The document describes a trickling filter, which is a biological wastewater treatment process using attached growth of microorganisms on media to remove organic matter. Wastewater is distributed over the top of the media (such as gravel or plastic), where microbes grow as biofilms and degrade organics. The treated water exits through underdrains while air flow through the media supports the aerobic biofilms. Higher rate filters use recirculation and plastic media to achieve greater organic removal at smaller footprints. Proper design and operation are needed to control issues like ponding, flies, odors, and icing.
This document discusses various filtration techniques used in pharmaceutical manufacturing. It begins by describing the mechanisms of filtration including straining and impingement. It then discusses various filter media and factors that influence the rate of filtration such as surface area, pressure, viscosity. Finally, it summarizes different types of filters including filter press, leaf filter, metafilter, cartridge filter, rotary drum filter, and membrane filter. It provides details on the construction and working of each type of filter.
This document discusses filtration processes used in fermentation industries. It begins by defining filtration as separating solid particles from a fluid mixture by forcing the fluid through a porous filter medium. It then discusses factors that affect filtration like viscosity, particle size/shape, and aseptic conditions. It describes cake filtration where solids build up on the filter over time. It also discusses using filter aids like diatomaceous earth to improve efficiency. Finally, it compares batch and continuous filters commonly used in fermentation, specifically plate and frame filters for batches and rotary vacuum precoat filters for high volumes.
Dear Readers,
The presentation may be helpful for those who wants to know the basic concept of paper making process.
Please post your valuable comments improve the quality of presentation.
Regards,
Nirjhar.
This document discusses various types of industrial filtration processes. It begins by defining filtration and clarification. It then covers the mechanisms of filtration, including straining, impingement, entanglement, and attractive forces. It describes types of filtration like surface filtration and depth filtration. Theories of filtration are discussed, including Poiseuille's equation, Darcy's equation, and the Kozeny-Carman equation. Factors influencing filtration and different pressure and vacuum filtration methods are also summarized, such as plate and frame filters, leaf filters, automatic belt filters, chamber filter presses, and vacuum filters.
This document discusses filtration principles and parameters for process design. It defines filtration as separating solids from liquid using a porous medium, outlines key factors like filter type and cake formation. The document also describes Darcy's law governing filtration rate based on properties like pressure, area and viscosity. Process design parameters discussed include feed characterization like particle size and shape, while equipment design considerations cover throughput, filtration time and whether washing is needed.
* Final volume = 400 mL * 50 = 20,000 mL = 20 L
* Final mass of CuSO4 = 0.1% of 20 L = 20 g
* Stock solution volume = 400 mL
* Stock solution mass of CuSO4 = x g
* Stock solution concentration = x/400 g/L
* Dilution ratio = 50
* Using dilution equation:
Initial concentration = Final concentration × Dilution factor
* x/400 g/L = 0.1% × 50
* x/400 = 0.005
* x = 0.005 × 400 = 0.2 g
The amount of copper sulphate required is 0.2 g. The answer is A.
The document defines filtration and clarification processes. It describes the basic components and process of filtration using a filter press. Key points include:
- Filtration separates solids from liquids using a porous medium, while clarification is used for very low solid concentrations below 1.0% w/v.
- A filter press uses alternating plates and frames with a filter medium to separate solids. Slurry enters the frames under pressure and the filtrate exits through outlets on the plates.
- Factors like particle properties, liquid properties, temperature, pressure difference, and filter media properties influence the filtration rate according to equations like Poiseuille's, Darcy's, and Kozeny-Carman
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1. Mechanical Unit Operations
10/17/2022 Mechanical unit operation - NPTEL 1
Week 8 : Filtration
L-25 Filtration
L-26 Principles of cake filtration
L-27 Principles of cake filtration 2
L-28 Filtration equipment
Prof. Nanda Kishore
Professor, IIT Guwahati
2. Filtration
Filtration mechanism
Cake filters
Filter media and filter aid
Principles of cake filtration
Principles of centrifugal filtration
Types and selection of equipment
Outline of discussion
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Filtration
It is separation of solids from a suspension by passing it through a porous filtering
medium or septum on which solids are deposited whereas fluid passes through
Filtration is the separation process of solid particles from liquids through a solid
support (or) filter medium.
Mechanism of filtration
Slurry: The suspension of solid and liquid to be filtered.
Filter medium: The porous medium used to retain the solids.
Filter cake: The accumulation of solids on the filter medium.
Filtrate: The clear liquid passing through the filter and collected in the receptor.
4. In order to have efficient filtration process, the feed is generally modified by pre-
treatment such as
Heating
Recrystallizing
Adding a filter aid, etc.
Many types of filters have been developed because of variety of duties to be
performed by filters
such as different types of materials to be filtered
widely differing process conditions, etc.
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5. Fluid flows through a filter medium because of a pressure differential across the
medium. Thus, filters are classified as
Operating with atmospheric pressure on upstream side of filter medium
Operating with atmospheric pressure on upstream side and a vacuum on
downstream side of medium
Higher pressures above atmospheric pressure may be developed by the force of
gravity acting on a column of liquid or by a pump or blower or by centrifugal force
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6. Gravity filters: Filter medium can be no finer than a coarse screen or a bed of
coarse particles like sand
Thus in industrial applications, they are restricted to
draining of liquor from very coarse crystals,
clarification of potable water,
treatment of wastewater, etc.
Industrial filters are generally batch or continuous type which, based on applied
force for filtration, can be classified as:
Pressure filters
Vacuum filters
Centrifugal separators
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7. Discontinuous filter: during operating cycle, flow of fluid through
the device is continuous, however, it is interrupted periodically to
permit discharging of accumulated solids
Continuous filter: discharge of both solids and fluid is
uninterrupted as long as equipment is in operation
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Filtration Mechanism
Based on separation mechanism, filters are divided into three
main groups
1. Cake filters
2. Clarifying filters
3. Cross flow filters
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Cake filters
Relatively large amounts of solids as a cake of crystals or sludge are separated by
cake filters
They include provisions for washing cake and removing some of liquid from solids
before discharge
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Clarifying filters
They remove small amounts of solids
to produce a clean gas or sparkling
clear liquids such as beverages
Particles are trapped inside filter
medium or on its external surface
Pores of filter medium are much larger
in diameter than particles to be
removed unlike the screens
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Cross flow filters
Feed suspension flows under pressure at a fairly
high velocity across the filter medium in cross
flow filters
Thin layer of solids may form on the surface of
medium but high liquid velocity do not allow it
to build up
Ceramic, metal or polymer membrane with
pores small enough to exclude most of
suspended particles are used as filter medium
Portion of liquid passes through medium as clear
filtrate, leaving a more concentrated suspension
as retentate
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Filter media
In industrial applications, a common filter medium is canvas cloth
Wooden cloth, metal cloth, glass cloth or paper cloth are used as filter media for
corrosive liquids
Synthetic fabrics such as nylon, polypropylene, and various polyesters can also be
used as chemically resistance filters
Filtrate may first come through as turbid or cloudy, then gradually clear filtrate
obtained Then cloudy filtrate is returned to the slurry tank for refiltration
Categories of material used as filter media
Woven material
Perforated sheet metal
Bed of granular solid built up on supporting medium
Prefabricated porous solid units
Membrane filter media
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Requirements of septum
Retain solids to be filtered and provide acceptable clean filtrate
Should not plug or blind
Should be chemically resistant and strong enough physically to withstand the process conditions
Should permit cake formed to discharge cleanly and completely
Should not be prohibitively expensive
It should-
1) be capable of delivering a clear filtrate at a suitable production
rate.
2) have sufficient mechanical strength.
3) be inert.
4) retain the solids without plugging at the start of filtration.
5) Not absorb dissolve material.
6) Sterile filtration imposes a special requirement since the pore size must not exceed the
dimension of bacteria or spores.
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Filter aids
Very fine or slimy solids often form a dense impermeable cake that can quickly plug
any filter medium that is fine enough to retain such fines
Feasible filtration of such solids require that porosity of cake be increased to
permit passage of liquor at a reasonable rate
It can be accomplished by adding a filter aid (which is inert) to slurry before start of
filtration
Ex. Diatomaceous silica, perlite, purified wood cellulose, or any other inert porous
solid which can enhance filtration rate
Subsequently filter aid may be separated from the filter cake by dissolving the
solids or by burning out the filter aid
If the solids have no value, then both solids and filter aid can be discarded
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Handling of filter aids
Filter aids may be used in either or both two ways:
1) Pre- coating technique: by forming a pre-coat over the filter medium by filtering a
suspension of the filter aid.
2) Body- mix technique: A small proportion of the filter aid (0.1- 0.5 %) is added to the
slurry to be filtered. This slurry is recirculated through the filter until a clear filtrate is
obtained, filtration then proceeds to completion.
Different flow rates can be achieved depending on grade of
aid-
1. Low flow rate: fine grade filter aids- mainly used for clarity
2. Fast flow rate: coarse grade filter aids- acceptable filtrate.
Examples of filter aids
Diatomite (Keiselgur) , obtained from natural siliceous deposits.
Perlite , it is an aluminium silicate. Cellulose, Asbestos, charcoal, talc, bentonite, fullers
earth etc.
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Principles of cake filtration
Principles are analogous to the case of flow through porous media or packed or fixed
beds (where resistance to flow is independent of time)
In cake filtration, resistance to flow increases with time as filter medium becomes
clogged or filter cake builds up
Thus, Ergun’s equation should be modified accordingly
Important parameters of interest are
flow rate through the filter and
pressure drop across the unit
As the time of filtration increases, gradually either
flow rate decreases or
pressure drop increases
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In constant pressure filtration, the pressure drop is held constant and the flow rate
allowed to fall with time
In constant rate filtration, pressure drop is progressively increases to give constant
filtration rate (this is very rare)
In cake filtration, the liquid passes through two resistance in series
•Resistances because of formation of cake
•Resistance of filter medium
Filter medium resistance is normally important only during the early stages of cake
filtration
Cake resistance is zero at the start of the filtration and increases with time as
filtration proceeds
If cake is washed after it is filtered, both resistances are constant during the
washing period; and that of the filter medium is usually negligible
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Pressure drop in Cake filtration
Overall pressure drop at any time is sum of pressure drops over
medium and cake
Let pa is inlet pressure, pb is outlet pressure and P’ is pressure at
boundary between cake and medium, then
overall pressure drop (∆p) = pa– pb
= (pa – p’) + (p’ – pb)
= ∆pc+ ∆pm
Where ∆pc and ∆pm are pressure drop over the cake and medium
Consider a thin layer of cake of thickness dL lying in the cake at a
distance L from filter medium and corresponding pressure at this layer
is p
This layer consists of thin bed of solid particles through which filtrate
is flowing
In this filter bed, the velocity is sufficiently low to ensure laminar flow
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In constant pressure filtration, the pressure drop is held constant and the flow rate
allowed to fall with time
In constant rate filtration, pressure drop is progressively increases to give constant
filtration rate (this is very rare)
In cake filtration, the liquid passes through two resistance in series
•Resistances because of formation of cake
•Resistance of filter medium
Filter medium resistance is normally important only during the early stages of cake
filtration
Cake resistance is zero at the start of the filtration and increases with time as
filtration proceeds
If cake is washed after it is filtered, both resistances are constant during the
washing period; and that of the filter medium is usually negligible
21. For the derivation of equation of pressure drop, Kozeny-Carmann equation for low
Reynolds numbers:
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22. Incompressible cake
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Filter cake of this type are called incompressible
i.e., resistance is independent of pressure drop, ∆p and of position, L
where 𝛂 is specific cake resistance
23. Compressible cake
Industrial slurries are mixture of agglomerates or flocsconsisting of loose assemblies of very small
particles
Resistance of such cakes depends on properties of flocs rather than on geometry of individual
particles (experimental observation)
Resistance of such a cake is sensitive to method used in preparing slurry and to age and
temperature of material. And such filtration cake is called as compressible filter cake
In such a compressible cake, specific cake resistance varies with distance from septum
Because cake nearest to the septum is subject to the greatest compressive force and has the
lowest void fraction. This makes the pressure gradient non-linear
Local value of αmay also very with time
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Empirical equation for cake resistance
By conducting constant pressure experiments at various ∆p, the variation of α with
∆p can be found
If αis independent of ∆p, the cake is called to be incompressible
In general, α increases with ∆pas most cakes are compressible at least to some
extent
For highly compressible cakes α increases rapidly with ∆p
α= αo(∆p)S
where αo and S are empirical constants
Here S is the compressibility coefficient of the cake
If S = 0, it is incompressible cake
S > 0, it is compressible cake (usually varies between 0.2 and 0.8)
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Principles of centrifugal filtration
Basic constant pressure filtration theory can be modified to apply to centrifugal
filtration
This theory applies after the cake has been deposited and during flow of clean
filtrate or fresh liquid through the cake
Assumption
Effects of gravity and of changes in kinetic energy of liquid are neglected
Pressure drop from centrifugal action equals the drag of the liquid flowing through
the cake
Cake is completely filled with liquid
Flow of liquid is laminar
Resistance of the filter medium is constant
Cake is nearly incompressible, i.e., average specific cake resistance can be used as
constant
26. Nomenclature
• r1 = radius of inner surface of liquid
• ri = radius of inner face of cake
• r2 = inside radius of basket
• b = height of the basket
• ω = angular velocity, rad/s
• q = volumetric flow rate of liquid
• ρ = density of liquid
Pressure drop from centrifugal action is
given by:
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Types of filtration equipment
Plate and Frame filters
Leaf filters
Rotary vacuum filters
Cross flow filtration
Rotary vacuum filters and cross flow filtration are continuous filtration
equipment.
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Selection of equipment
Properties of filtrate, particularly viscosity and density.
Nature of the solid particles, particularly their size, shape and size distribution and
packing characteristics.
Solid to liquid ratio
Need for recovery of solid or liquid.
Need for batch or continuous operation.
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-Hill, International Edition, 2005.
[3] E. Ortega-Rivas, Unit Operations of Particulate Solids: Theory and Practice, CRC Press, FL, 2012.
[4] J.F. Richardson, J.H. Harker, Coulson and Richardson’s Chemical Engineering, 2nd Volume, 5th
Ed., Butterworth-Heinemann, 2003.
[5] C.J. Geankoplis, Transport Processes and Unit Operations, 4th Ed., Prentice Hall, India, 1993.
[6] G.G. Brown et al., Unit Operations, 1st Ed., CBS Publishers & Distributors, 2005.
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International Edition, 1997.
Books and references