Solvent extraction, also known as liquid-liquid extraction, is a method used to separate compounds based on their relative solubilities in two different immiscible liquids, usually water and an organic solvent. It involves transferring solutes from a feed solution to another immiscible liquid called the extract. Solvent extraction was first developed in analytical chemistry and is now widely used in hydrometallurgy and other industries to separate and extract various metals, rare earth elements, and other compounds. Key aspects of solvent extraction processes include the selection of appropriate organic solvents and diluents, extraction equipment like mixer-settlers or columns, and multi-stage counter-current contacting to efficiently separate solutes.
Liquid liquid extraction useful for B. Pharmacy students. solvent extraction is one of the separation technique and it is the most common method adopted in the field of analysis
Liquid liquid extraction useful for B. Pharmacy students. solvent extraction is one of the separation technique and it is the most common method adopted in the field of analysis
Electron Spin Resonance (ESR) SpectroscopyHaris Saleem
Electron Spin Resonance Spectroscopy
Also called EPR Spectroscopy
Electron Paramagnetic Resonance Spectroscopy
Non-destructive technique
Applications
Extensively used in transition metal complexes
Deviated geometries in crystals
What is Gravimetric analysis, stepes invloved in gravimetry, Filteration medium in gravimetry, gravimetric factor, application, organic and inorganic prepecating agents
NQR - DEFINITION - ELECTRIC FIELD GRADIENT - NUCLEAR QUADRUPOLE MOMENT - NUCLEAR QUADRUPOLE COUPLING CONSTANT - PRINCIPLE OF NQR - ENERGY OF INTERACTION - SELECTION RULE - FREQUENCY OF TRANSITION - APPLICATIONS
Electron Spin Resonance (ESR) SpectroscopyHaris Saleem
Electron Spin Resonance Spectroscopy
Also called EPR Spectroscopy
Electron Paramagnetic Resonance Spectroscopy
Non-destructive technique
Applications
Extensively used in transition metal complexes
Deviated geometries in crystals
What is Gravimetric analysis, stepes invloved in gravimetry, Filteration medium in gravimetry, gravimetric factor, application, organic and inorganic prepecating agents
NQR - DEFINITION - ELECTRIC FIELD GRADIENT - NUCLEAR QUADRUPOLE MOMENT - NUCLEAR QUADRUPOLE COUPLING CONSTANT - PRINCIPLE OF NQR - ENERGY OF INTERACTION - SELECTION RULE - FREQUENCY OF TRANSITION - APPLICATIONS
Counter current chromatography (CCC) is a liquid chromatography technique that
uses two immiscible liquid phases and no solid support.
2. One liquid acts as the stationary phase and the other as the mobile phase.
3. In Dual Flow CCC/CPC both liquid phases are flowing, as would be common in counter
current process extractors.
4. The liquid stationary phase(s) is held in place by gravity or by centrifugal force. The
gravity method is called droplet counter current chromatography (DCCC).
5. There are two modes of centrifugal force CCC: hydrostatic and hydrodynamic. In the
hydrostatic method.
6. The column is spun about
In most chemical engineering curriculums, distillation and liquid-liquid extraction (LLE) do not receive equal billing. Yet, this powerful separations technology is in place across the CPI, pharmaceutical and oil/gas industries. Discover how to design an LLE column with industry experts Don Glatz and Brendan Cross as they discuss specific examples and separations challenges.
Surface Chemistry and its impacts on chemical and electronic industryKramikauniyal
The content thoroughly explains about the processes and phenomenon that occur and are related to the surfaces of substances and how are they so impactful in chemical and electronic industry.
Complex-formation reactions are widely used in analytical chemistry. One of the first uses of these reagents was for titrating cations. In addition, many complexes are colored or absorb ultraviolet radiation; the formation of these complexes is often the basis for spectrophotometric determinations. Some complexes are sparingly soluble and can be used in gravimetric analysis. Complexes are also widely used for extracting cations from one solvent to another and for dissolving insoluble precipitates. The most useful complex forming reagents are organic compounds that contain several electron donor groups that form multiple covalent bonds with metal ions.
FORMING COMPLEXES
Most metal ions react with electron-pair donors to form coordination compounds or complexes. The donor species, or ligand is an ion or a molecule that forms a covalent bond with a cation or a neutral metal atom by donating a pair of electrons that are then shared by the two.
The number of covalent bonds that a cation tends to form with electron donors is its coordination number. Typical values for coordination numbers are two, four, and six. The species formed as a result of coordination can be electrically positive, neutral, or negative.
A ligand that has a single donor group, such as ammonia, is called unidentate(single-toothed), whereas one such as glycine, which has two groups available for covalent bonding, is called bidenate. Tridentate, tetradentate, pentadentate, and hexadentate chelating agents are also known.
Another important type of complex, a macrocycle, is formed between a metal ion and a cyclic organic compound. The selectivity of a ligand for one metal ion over another relates to the stability of the complexes formed. The higher the formation constant of a metal-ligand complex, the better the selectivity of the ligand for the metal relative to similar complexes formed with other metals.
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Understand the basics of Water Quality Control to avoid the scale corrosion and biological growth in the Power plant system, and to operate the mentioned at max performance.
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
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An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
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Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
2. What is Solvent Extraction ?
Solvent Extraction, also known as liquid-liquid
extraction, is a method to separate compounds based
on their relative solubilities in two different immiscible
liquids, usually water and an organic solvent.
3. Importance of the process:
The Solvent Extraction(S.E.) process was first
developed as a tool of analytical chemistry. Every
metallic element of the periodic table could be
virtually separated by this process.
Back in 1940’s , S.E. was primarily used to separate
nuclear and rare earth elements.
However, availability of inexpensive and effective
reagents led to the establishment of large scale S.E.
processes for extraction of non-ferrous metals from
hydrometallurgical leach liquors.
4. Solvent Extraction, consists of transferring one (or
more) solute(s) contained in a feed solution to
another immiscible liquid (solvent).
The solvent that is enriched in solute(s) is called
Extract & the feed solution that is depleted of
solute(s) is called Raffinate.
13. Distribution Coefficient
At a certain temperature, the ratio of concentrations of a
solute in each of the solvents is always constant.
This ratio is known as the Distribution Coefficient(KD)
KD =
Conc. of metal ion in Organic Phase
Conc. of metal ion in Aqueous Phase
14.
15.
16. Extraction Equilibria
For a chelating reagent, HR, the extraction reaction for
a metal ion Mn+ can be represented as:
Maq
n+ + n HRorg MRn org + H+
aq
The Extraction Constant(Kex) is given by:
Kex =
[MRn]org [H+]n
aq
[Mn+]aq [HR]n
org
17. The extraction constant can also be expressed as:
Kex =
KD .[H+]n
aq
[HR]n
org
Where,
KD =
[MRn]org
[Mn+]aq
18. The extraction constant can also be expressed as:
Kex =
log KD = log Kex + n pH + n log [HR]org
KD .[H+]n
aq
[HR]n
org
Where,
KD =
[MRn]org
[Mn+]aq
19. Extraction Coefficient
It indicates how much of the metal will move from
the aqueous phase to the organic phase in a single
contact.
Effective extraction coefficient (EF) can be expressed as:
EF =
[Mn+]org (Vol.)org
[Mn+]aq (Vol.)aq
20. Single Stage vs. Multistage
Single Stage S.E.
Single stage process is commonly
followed in laboratory scale.
Contacting is carried out by taking two phases together
in a separating funnel followed by vigorous agitation so
that the phases may disperse in each other as fine
droplets. Ceasing the agitation lead to the separation of
phases in two distinct layers.
21. Single Stage S.E.
From mass balance it can be shown that:
= 1 +
where,
X0 = Conc. of metal ions in the feed solution
i.e. the aqueous phase before any contact.
X1 = Conc. of metal ions in the aq. raffinate
i.e. the aqueous phase after a single contact.
X1
X0
[Mn+]org (Vol.)org
[Mn+]aq (Vol.)aq
22. Single Stage S.E.
From mass balance it can be shown that:
= 1 + EF
where,
X0 = Conc. of metal ions in the feed solution
i.e. the aqueous phase before any contact.
X1 = Conc. of metal ions in the aq. raffinate
i.e. the aqueous phase after a single contact.
X1
X0
23. Multi Stage Counter Current S.E.
For extraction of metals on Industrial scale, multi stage
counter current solvent extraction process is followed.
The aqueous raffinate from one extraction unit is fed to
the next unit as the aqueous feed, while the organic
solvent flows in the opposite direction, thereby picking
up more metal ions in successive contacts.
Dividing the organic phase into small parts & making
multiple contacts is the most efficient way of extracting.
25. For a single contact :
= 1 + EF
For multistage contact (assuming n contacts):
= ( 1 + EF/n)n
X1
X0
Xn
X0
26. For a single contact :
= 1 + EF
For multistage contact (assuming n contacts):
= ( 1 + EF/n)n
As lim n ∞
= = exp(-EF)
X1
X0
Xn
X0
X0
Xn 1
exp(EF)
27. For a single contact :
= 1 + EF
For multistage contact (assuming n contacts):
= ( 1 + EF/n)n
As lim n ∞
= = exp(-EF)
So, Multistage contacting is Best
X1
X0
Xn
X0
X0
Xn 1
exp(EF)
30. Selection of Organic Solvent
High extraction capacity
Selectivity
Easily Stripped
Immiscible in aqueous phase
Sufficient density difference with the aq. phase
Low Viscosity
Non toxic
Non explosive
Cheap
31. Diluents
Diluent is required for dissolving or diluting the organic extractant so
that its physical properties like viscosity and density become more
favorable for better mixing of the two phases and their separation.
Aliphatic or Aromatic hydrocarbons or a combination of both, are used
as diluent.
Diluent affects the extraction, scrubbing, stripping and phase
separation process quite significantly.
Examples of some common diluents:
Kerosene
Benzene
Chloroform
Xylene
Naptha
Toluene
35. Application
Today the process of Solvent Extraction is widely applied in
miscellaneous fields of Science and Technology
Analytical Chemistry
Extraction of Rare-earths & PGM
Waste water treatment
Mineral oil treatment & dewaxing
Food industry(essential oil extraction)
Perfume industry(fragrance extraction)
Pharmaceutical industry
36. Conclusion
In spite of having the advantage of a rapid extraction kinetics with
a feasibility of recycling the solvent, there are some drawbacks of
this process.
Use of toxic and flammable organic diluents
Sometimes the cost of solvent system becomes too expensive
In several cases there is loss of organic solvent in the process
Solvent Extraction may not pollute the air as much as other
pyrometallurgical processes, but a lot of toxic chemicals find
their way into the waterbodies, polluting them.
The extensive application of S.E. has become a field(& industry!)
of its own. With proper modeling of the process, invention of new
equipments, use of more effective extractants and a better
understanding of the science behind it may lead it to be one of the
most important extraction processes in metallurgy.