Study in Kinetics of Saponification Reaction of Diethyl Adipate with Sodium Hydroxide Solution under Reactive Distillation

Authors

  • Raghad fareed kasim Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq
  • Rouaa Ali Shokorr Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq

DOI:

https://doi.org/10.31699/IJCPE.2016.1.9

Keywords:

reactive distillation, kinetic study, consecutive reaction, saponification reaction.

Abstract

This research presents a new study in kinetics under reactive distillation by using consecutive two – step reaction : the saponification reaction of diethyl adipate with sodium hydroxide solution . The distillation process takes the role of withdrawing the intermediate product (sodium monoethyladipate SMA) which otherwise converts to the final product of low purity.The effect of three parameters were studied through a design of experiments applying 23 factorial design. These parameters were : the mole ratio of DA to NaOH solution (0.1 and 1) , NaOH solution concentration (3 N and 8 N) , and batch time (1.5 hr. and 3.5 hr.) . The conversion of DA to sodium monoethyladipate(SMA)(intermediate product) was the effect of these parameters which was detected .The results showed that increasing mole ratio of DA to NaOHsolution increases the conversionto a maximum value within the range of study.The effect of NaOH solution concentration decreases the conversion to a specified value within the range of study . The effect of batch time on conversion was decreasing the conversion to a specified value within the range of study . The maximum attainable conversion within the studied range of parameters was  eighteen fold of thebase case.Reaction rate constant k and the order of reaction n of first reaction weredetrminedusing the differential method . The study attempted to determine n and k under the maximum conversion condition obtained in this system which corresponds to : feed mole ratio of diethyl adipateDA to NaOH solution of 0.3,NaOH solution concentration of3 Nandtime of1.5 hr.The study showed that the reaction order was 1.5and reaction rate constant was 0.8m3/kmol.s at a temperature of 100

References

Al – Arfaj , M. , " Quantitative heuristic design of reactive distillation " , Chemical department, College of Engineering , University of Lehigh , 1999 .

Lone , S. R. , and Ahmad , S. A. , "Modelling and Simulation of Ethyl Acetate Reactive Distillation Using Aspen Plus" , International Journal of Scientific & Engineering Research , Vol. 3 , No. 8 , PP. (1 –5) , 2012 .

Al – Arfaj , M. , and Luyben , W. L., "Comparison of Alternative Control Structures for an Ideal Two–Product Reactive Distillation Column " , Industrial Chemical Engineering Research , Vol. 39 , No. 9 , PP. (3298 – 3307) , 2000 .

Munshi , B. , and Kumar , S. , "Modelling and Simulation of ethylacetate reactive distillation column using ASPEN PLUS " , Thesis , Chemical Department , College of Engineering , University of Technology, Iraq , 2010.

Luyben , W. L. , and Yu ,C. , (2008), " Reactive Distillation Design and Control " , WILEY , United States of America , 1-574.

Kasim , R. F. , and Shokorr , R. A. , (2015) , " Semi- Batch Reactive Distillation of Consecutive Reaction:The Saponification of Diethyl Adipate with Sodium Hydroxide Solution " , Baghdad University, Chemical Engineering , 1-133.

Newberger , M. R. , and Kadlec , R. H. , (1973) , " Kinetics of the Saponification of Diethyl Adipate ", AIChE Journal , No. 6 , Vol. 19 , 1272 – 1275.

Ingold , C. K. , (1973) " The Mechanism and Constitutional FactorsControlling the Hydrolysis of Carboxylic Esters " , Westheimer, F. H. , W. A. Jones , and R. A. Lad , " Electrostatic Influence of Substituents on Reactor Rates " , Frost , A. A. , and W. C. Schweimer, " The Kinetics of Competitive Consecutive Second Order Reactions – The Saponification of Ethyl Adipate and Ethyl Succinate ", cited in Newberger , M. R. , and Kadlec , R. H. , " Kinetics of the Saponification of Diethyl Adipate ", AIChE Journal , No. 6 , Vol. 19 , 1272 – 1275.

Montgomery, D. C., 2001, DESIGNANDANALYSISOFEXPE RIMENTS, 5th ed., John Wiley &Sons (Asia) Pte. Ltd., Singapor.

Vogel , A. I. , (1961) , "QUANTITATIVE INORGANIC ANALYSIS INCLUDING ELEMENTARY INSTRUMENTAL ANALYSIS " , LONGMANS , GREEN AND CO LTD 48 Grosvenor Street , 3rd ed. , London , 1-1216 .

Levenspiel, O., (1999), “CHEMICAL REACTION ENGINEERING”, John Wiley & Sons, United States of America, 3rd ed., 1-668.

Downloads

Published

2016-03-30

How to Cite

kasim, R. fareed, & Shokorr, R. A. (2016). Study in Kinetics of Saponification Reaction of Diethyl Adipate with Sodium Hydroxide Solution under Reactive Distillation. Iraqi Journal of Chemical and Petroleum Engineering, 17(1), 99-108. https://doi.org/10.31699/IJCPE.2016.1.9

Publication Dates