SlideShare a Scribd company logo
Fatty Acid
Distillation(FD5)
Objective
To Convey
 Fatty Acid Plant and all its sections
 Tank yard
 Hydrogenation
 Splitting
 Distillation
 Flakes formation
 Glycerine Plant
 What actually distillation is?
 The basic principle
 Fatty acid distillation
 Why is fatty acid distillation done?
 Main equipments used here
 P&ID
 Results
Tank yard
Hydroge
nation
Splitting
Distillatio
n
Flakes
Glycerine
SNP
Fatty Acid Plant
Fatty acids and their composition in palm stearin
 A carboxylic acid with a long aliphatic chain
 Either saturated or unsaturated
Lauric
acid(C12:0)
Myristic
acid(C14:0)
Palmitic
acid(C16:0)
Stearic
acid(C18:0)
Oleic acid
(C18:1)
Linoleic
acid(C18:2)
Linolenic
acid(C18:3)
Arachidic
acid(C20:0)
Distillation & Principle
 Distillation is process of separating the selective components from
the liquid mixture by selective evaporation and condensation.
 The basic principle is that “different liquids boil and evaporate at
different temperatures.So,when the mixture is heated, the
substance with lower boiling point starts to boil first and convert
into vapours.”
Fatty Acid Distillation and why it is done?
 Distillation process makes use of the differences in boiling points between the
desired fatty acids and the impurities, to effect a separation of these
components.
 Crude fatty acids produced from fats splitting process are purified by
distillation, and can be separated further into individual fatty acids by fractional
distillation.
 Fatty acid distillation is carried out under reduced pressure (vacuum) and
lowest possible temperature to ensure product stability,to improve colour and
to enhance the purity of product.
 In the distillation, the fatty acids are vaporized and then condensed, leaving
the high-boiling impurities (residue) in the distillation still.
Main Equipments
 Shell and tube heat exchangers
 Plate type heat exchangers
 Dryer
 Reboiler
Main Equipments
 Condenser
 Barometric condenserr
 Scrubber
 Centrifugal Pump
Results
Feed Flow rate
(Kg/hr)
Production flow
rate (kg/hr)
Top vacuum(m
bar)
HTO pump
suction(Bar)
HTO pump
discharge
pressure (Bar)
Reflux flow rate
(Kg/hr)
3653 4059 09 3.8 4.1 138
3699 4111 10 3.8 4.1 141
3600 4000 08 3.9 4.1 140
3600 4100 08 3.9 4.1 140
P&ID
References
 M.R. Resetarits, M.J. Lockett, in Encyclopedia of Physical Science and Technology (Third
Edition), 2003
 J.D. Green, in Encyclopedia of Analytical Science (Second Edition), 2005
Thank You

More Related Content

Similar to Presentation.pptx

Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
IJERD Editor
 
Possibilities and Potentiality to increase-blending-ratio- of palm olein wit...
Possibilities and Potentiality to  increase-blending-ratio- of palm olein wit...Possibilities and Potentiality to  increase-blending-ratio- of palm olein wit...
Possibilities and Potentiality to increase-blending-ratio- of palm olein wit...
Adel Gabr Abdel-Razek
 
Choosing the right oil or fat
Choosing the right oil or fatChoosing the right oil or fat
Choosing the right oil or fat
Laurence Eyres
 
Choosing the right oil or fat
Choosing the right oil or fatChoosing the right oil or fat
Choosing the right oil or fat
Laurence Eyres
 
LIPIDS
LIPIDSLIPIDS
LIPIDS
Dr. Almas A
 
Effluent from petroleum refineries
Effluent from petroleum refineriesEffluent from petroleum refineries
Effluent from petroleum refineries
Tulsi Makwana
 
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
SAJJAD KHUDHUR ABBAS
 
BR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
BR-70701-LC-GC-NIR-ICP-Edible-Oil-WorkflowsBR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
BR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
dmend129
 
Biodiesel production
Biodiesel productionBiodiesel production
Biodiesel production
Ajay Singh Lodhi
 
Treatment of Industrial Oily Waste Water
Treatment of Industrial Oily Waste WaterTreatment of Industrial Oily Waste Water
Treatment of Industrial Oily Waste Water
SONAL GARG
 
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
IOSRJAC
 
Phytochemical Processing
Phytochemical ProcessingPhytochemical Processing
Phytochemical Processing
Saiful Irwan Zubairi
 
Fatty Acid Isolation (Unit 4 a)
Fatty Acid Isolation (Unit 4 a)Fatty Acid Isolation (Unit 4 a)
Fatty Acid Isolation (Unit 4 a)
Dr. Mohammed Danish
 
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
SAJJAD KHUDHUR ABBAS
 
Biodiesel production
Biodiesel productionBiodiesel production
Biodiesel production
Ajay Singh Lodhi
 
Pathapati Bioprocessing Symposium 2011
Pathapati Bioprocessing Symposium 2011Pathapati Bioprocessing Symposium 2011
Pathapati Bioprocessing Symposium 2011
kk_pathapati
 
Pathapati- bioprocessing symposium 2011
Pathapati- bioprocessing symposium 2011Pathapati- bioprocessing symposium 2011
Pathapati- bioprocessing symposium 2011
Kiran Pathapati
 
Oil and fat processing
Oil and fat processingOil and fat processing
Oil and fat processing
Raviteja Thanda
 
Rajat tiwari, 2 k14 214, 10.4-10.7-1
Rajat tiwari, 2 k14 214, 10.4-10.7-1Rajat tiwari, 2 k14 214, 10.4-10.7-1
Rajat tiwari, 2 k14 214, 10.4-10.7-1
translateds
 
Animal fat process final ppt.
Animal fat process final ppt.Animal fat process final ppt.
Animal fat process final ppt.
MehakJandyal1
 

Similar to Presentation.pptx (20)

Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
Production and Analysis of Chemical Properties of Chicken Fat Based Biodiesel...
 
Possibilities and Potentiality to increase-blending-ratio- of palm olein wit...
Possibilities and Potentiality to  increase-blending-ratio- of palm olein wit...Possibilities and Potentiality to  increase-blending-ratio- of palm olein wit...
Possibilities and Potentiality to increase-blending-ratio- of palm olein wit...
 
Choosing the right oil or fat
Choosing the right oil or fatChoosing the right oil or fat
Choosing the right oil or fat
 
Choosing the right oil or fat
Choosing the right oil or fatChoosing the right oil or fat
Choosing the right oil or fat
 
LIPIDS
LIPIDSLIPIDS
LIPIDS
 
Effluent from petroleum refineries
Effluent from petroleum refineriesEffluent from petroleum refineries
Effluent from petroleum refineries
 
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD PALM KERNEL ...
 
BR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
BR-70701-LC-GC-NIR-ICP-Edible-Oil-WorkflowsBR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
BR-70701-LC-GC-NIR-ICP-Edible-Oil-Workflows
 
Biodiesel production
Biodiesel productionBiodiesel production
Biodiesel production
 
Treatment of Industrial Oily Waste Water
Treatment of Industrial Oily Waste WaterTreatment of Industrial Oily Waste Water
Treatment of Industrial Oily Waste Water
 
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
Synthesis, Characterization and Performance Evaluation of Poly Octadecyl Meth...
 
Phytochemical Processing
Phytochemical ProcessingPhytochemical Processing
Phytochemical Processing
 
Fatty Acid Isolation (Unit 4 a)
Fatty Acid Isolation (Unit 4 a)Fatty Acid Isolation (Unit 4 a)
Fatty Acid Isolation (Unit 4 a)
 
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
Episode 4: PRODUCTION OF 60, 000 MTPA OF OLEOCHEMICAL METHYL ESTER FROM RBD P...
 
Biodiesel production
Biodiesel productionBiodiesel production
Biodiesel production
 
Pathapati Bioprocessing Symposium 2011
Pathapati Bioprocessing Symposium 2011Pathapati Bioprocessing Symposium 2011
Pathapati Bioprocessing Symposium 2011
 
Pathapati- bioprocessing symposium 2011
Pathapati- bioprocessing symposium 2011Pathapati- bioprocessing symposium 2011
Pathapati- bioprocessing symposium 2011
 
Oil and fat processing
Oil and fat processingOil and fat processing
Oil and fat processing
 
Rajat tiwari, 2 k14 214, 10.4-10.7-1
Rajat tiwari, 2 k14 214, 10.4-10.7-1Rajat tiwari, 2 k14 214, 10.4-10.7-1
Rajat tiwari, 2 k14 214, 10.4-10.7-1
 
Animal fat process final ppt.
Animal fat process final ppt.Animal fat process final ppt.
Animal fat process final ppt.
 

Recently uploaded

A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
DharmaBanothu
 
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
nedcocy
 
Object Oriented Analysis and Design - OOAD
Object Oriented Analysis and Design - OOADObject Oriented Analysis and Design - OOAD
Object Oriented Analysis and Design - OOAD
PreethaV16
 
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICSUNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
vmspraneeth
 
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
upoux
 
Accident detection system project report.pdf
Accident detection system project report.pdfAccident detection system project report.pdf
Accident detection system project report.pdf
Kamal Acharya
 
Supermarket Management System Project Report.pdf
Supermarket Management System Project Report.pdfSupermarket Management System Project Report.pdf
Supermarket Management System Project Report.pdf
Kamal Acharya
 
Determination of Equivalent Circuit parameters and performance characteristic...
Determination of Equivalent Circuit parameters and performance characteristic...Determination of Equivalent Circuit parameters and performance characteristic...
Determination of Equivalent Circuit parameters and performance characteristic...
pvpriya2
 
Levelised Cost of Hydrogen (LCOH) Calculator Manual
Levelised Cost of Hydrogen  (LCOH) Calculator ManualLevelised Cost of Hydrogen  (LCOH) Calculator Manual
Levelised Cost of Hydrogen (LCOH) Calculator Manual
Massimo Talia
 
FULL STACK PROGRAMMING - Both Front End and Back End
FULL STACK PROGRAMMING - Both Front End and Back EndFULL STACK PROGRAMMING - Both Front End and Back End
FULL STACK PROGRAMMING - Both Front End and Back End
PreethaV16
 
AN INTRODUCTION OF AI & SEARCHING TECHIQUES
AN INTRODUCTION OF AI & SEARCHING TECHIQUESAN INTRODUCTION OF AI & SEARCHING TECHIQUES
AN INTRODUCTION OF AI & SEARCHING TECHIQUES
drshikhapandey2022
 
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
OKORIE1
 
Digital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptxDigital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptx
aryanpankaj78
 
Blood finder application project report (1).pdf
Blood finder application project report (1).pdfBlood finder application project report (1).pdf
Blood finder application project report (1).pdf
Kamal Acharya
 
An Introduction to the Compiler Designss
An Introduction to the Compiler DesignssAn Introduction to the Compiler Designss
An Introduction to the Compiler Designss
ElakkiaU
 
Assistant Engineer (Chemical) Interview Questions.pdf
Assistant Engineer (Chemical) Interview Questions.pdfAssistant Engineer (Chemical) Interview Questions.pdf
Assistant Engineer (Chemical) Interview Questions.pdf
Seetal Daas
 
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
upoux
 
Presentation on Food Delivery Systems
Presentation on Food Delivery SystemsPresentation on Food Delivery Systems
Presentation on Food Delivery Systems
Abdullah Al Noman
 
Butterfly Valves Manufacturer (LBF Series).pdf
Butterfly Valves Manufacturer (LBF Series).pdfButterfly Valves Manufacturer (LBF Series).pdf
Butterfly Valves Manufacturer (LBF Series).pdf
Lubi Valves
 
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptxEV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
nikshimanasa
 

Recently uploaded (20)

A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...
 
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
 
Object Oriented Analysis and Design - OOAD
Object Oriented Analysis and Design - OOADObject Oriented Analysis and Design - OOAD
Object Oriented Analysis and Design - OOAD
 
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICSUNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
UNIT 4 LINEAR INTEGRATED CIRCUITS-DIGITAL ICS
 
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
 
Accident detection system project report.pdf
Accident detection system project report.pdfAccident detection system project report.pdf
Accident detection system project report.pdf
 
Supermarket Management System Project Report.pdf
Supermarket Management System Project Report.pdfSupermarket Management System Project Report.pdf
Supermarket Management System Project Report.pdf
 
Determination of Equivalent Circuit parameters and performance characteristic...
Determination of Equivalent Circuit parameters and performance characteristic...Determination of Equivalent Circuit parameters and performance characteristic...
Determination of Equivalent Circuit parameters and performance characteristic...
 
Levelised Cost of Hydrogen (LCOH) Calculator Manual
Levelised Cost of Hydrogen  (LCOH) Calculator ManualLevelised Cost of Hydrogen  (LCOH) Calculator Manual
Levelised Cost of Hydrogen (LCOH) Calculator Manual
 
FULL STACK PROGRAMMING - Both Front End and Back End
FULL STACK PROGRAMMING - Both Front End and Back EndFULL STACK PROGRAMMING - Both Front End and Back End
FULL STACK PROGRAMMING - Both Front End and Back End
 
AN INTRODUCTION OF AI & SEARCHING TECHIQUES
AN INTRODUCTION OF AI & SEARCHING TECHIQUESAN INTRODUCTION OF AI & SEARCHING TECHIQUES
AN INTRODUCTION OF AI & SEARCHING TECHIQUES
 
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
DESIGN AND MANUFACTURE OF CEILING BOARD USING SAWDUST AND WASTE CARTON MATERI...
 
Digital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptxDigital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptx
 
Blood finder application project report (1).pdf
Blood finder application project report (1).pdfBlood finder application project report (1).pdf
Blood finder application project report (1).pdf
 
An Introduction to the Compiler Designss
An Introduction to the Compiler DesignssAn Introduction to the Compiler Designss
An Introduction to the Compiler Designss
 
Assistant Engineer (Chemical) Interview Questions.pdf
Assistant Engineer (Chemical) Interview Questions.pdfAssistant Engineer (Chemical) Interview Questions.pdf
Assistant Engineer (Chemical) Interview Questions.pdf
 
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
 
Presentation on Food Delivery Systems
Presentation on Food Delivery SystemsPresentation on Food Delivery Systems
Presentation on Food Delivery Systems
 
Butterfly Valves Manufacturer (LBF Series).pdf
Butterfly Valves Manufacturer (LBF Series).pdfButterfly Valves Manufacturer (LBF Series).pdf
Butterfly Valves Manufacturer (LBF Series).pdf
 
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptxEV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
EV BMS WITH CHARGE MONITOR AND FIRE DETECTION.pptx
 

Presentation.pptx

  • 2. Objective To Convey  Fatty Acid Plant and all its sections  Tank yard  Hydrogenation  Splitting  Distillation  Flakes formation  Glycerine Plant  What actually distillation is?  The basic principle  Fatty acid distillation  Why is fatty acid distillation done?  Main equipments used here  P&ID  Results
  • 4. Fatty acids and their composition in palm stearin  A carboxylic acid with a long aliphatic chain  Either saturated or unsaturated Lauric acid(C12:0) Myristic acid(C14:0) Palmitic acid(C16:0) Stearic acid(C18:0) Oleic acid (C18:1) Linoleic acid(C18:2) Linolenic acid(C18:3) Arachidic acid(C20:0)
  • 5. Distillation & Principle  Distillation is process of separating the selective components from the liquid mixture by selective evaporation and condensation.  The basic principle is that “different liquids boil and evaporate at different temperatures.So,when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.”
  • 6. Fatty Acid Distillation and why it is done?  Distillation process makes use of the differences in boiling points between the desired fatty acids and the impurities, to effect a separation of these components.  Crude fatty acids produced from fats splitting process are purified by distillation, and can be separated further into individual fatty acids by fractional distillation.  Fatty acid distillation is carried out under reduced pressure (vacuum) and lowest possible temperature to ensure product stability,to improve colour and to enhance the purity of product.  In the distillation, the fatty acids are vaporized and then condensed, leaving the high-boiling impurities (residue) in the distillation still.
  • 7. Main Equipments  Shell and tube heat exchangers  Plate type heat exchangers  Dryer  Reboiler
  • 8. Main Equipments  Condenser  Barometric condenserr  Scrubber  Centrifugal Pump
  • 9. Results Feed Flow rate (Kg/hr) Production flow rate (kg/hr) Top vacuum(m bar) HTO pump suction(Bar) HTO pump discharge pressure (Bar) Reflux flow rate (Kg/hr) 3653 4059 09 3.8 4.1 138 3699 4111 10 3.8 4.1 141 3600 4000 08 3.9 4.1 140 3600 4100 08 3.9 4.1 140
  • 10. P&ID
  • 11. References  M.R. Resetarits, M.J. Lockett, in Encyclopedia of Physical Science and Technology (Third Edition), 2003  J.D. Green, in Encyclopedia of Analytical Science (Second Edition), 2005