Publication detail

Transesterification of Lactic Acid Oligomers with Ethanol, a Way to Anhydrous Ethyl Lactate: A Kinetic Study

FIGALLA, S. PETRŮJ, J. ŠVESTKOVÁ, T.

Original Title

Transesterification of Lactic Acid Oligomers with Ethanol, a Way to Anhydrous Ethyl Lactate: A Kinetic Study

Type

journal article in Web of Science

Language

English

Original Abstract

A new method for the preparation of anhydrous ethyl ester of lactic acid was studied. The selected method is based on catalytic transesterification of lactic acid oligomers, which were prepared for this purpose by autocatalytic oligomerization of lactic acid. In this work, a kinetic model for the case of catalytic alcoholysis of oligoesters was derived assuming a first-order reaction and equimolar content of reactants in the reaction mixture. The model makes it possible to obtain the values of the reaction rate and equilibrium constants and the equilibrium alcohol concentration by regression analysis at one time. The model was verified by measuring the rate of consumption of ethanol over the time at various reaction temperatures with anhydrous FeCl3 as the catalyst. The reaction was studied at overpressure under autogenous conditions in the temperature range of 100–180 °C. For the catalyst concentration of 1 mol %, the activation energy value was 64.35 kJ·mol−1. The dependence of equilibrium composition and rate constant on the temperature was obtained. The derived model is generally applicable to all first-order equilibrium reactions. The presumption is that the forward and reverse reactions are of the same order and have the same stoichiometry and equivalent amounts of reactants at the beginning of the reaction.

Keywords

ethyl lactate; transesterification; kinetics; lactic acid; oligomerization

Authors

FIGALLA, S.; PETRŮJ, J.; ŠVESTKOVÁ, T.

Released

15. 8. 2018

Publisher

MDPI

Location

Basilej, Švýcarsko

ISBN

1420-3049

Periodical

MOLECULES

Year of study

23

Number

8

State

Swiss Confederation

Pages from

1

Pages to

13

Pages count

13

URL

http://www.mdpi.com/1420-3049/23/8/2044

Full text in the Digital Library

http://hdl.handle.net/11012/85321

BibTex

@article{BUT149385,
  author="Silvestr {Figalla} and Jaroslav {Petrůj} and Tereza {Tulková}",
  title="Transesterification of Lactic Acid Oligomers with Ethanol, a Way to Anhydrous Ethyl Lactate: A Kinetic Study",
  journal="MOLECULES",
  year="2018",
  volume="23",
  number="8",
  pages="1--13",
  doi="10.3390/molecules23082044",
  issn="1420-3049",
  url="http://www.mdpi.com/1420-3049/23/8/2044"
}