Detail publikačního výsledku
Anhydrous ethyl lactate synthesis by transesterification of oligomeric lactic acid
FIGALLA, S.
Originální název
Anhydrous ethyl lactate synthesis by transesterification of oligomeric lactic acid
Anglický název
Anhydrous ethyl lactate synthesis by transesterification of oligomeric lactic acid
Druh
Abstrakt
Originální abstrakt
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.
Anglický abstrakt
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.
Klíčová slova
ethyl lactate, lactic acid, transesterification
Klíčová slova v angličtině
ethyl lactate, lactic acid, transesterification
Autoři
FIGALLA, S.
Rok RIV
2019
Vydáno
12.09.2018
Místo
Brno
ISBN
978-80-214-5488-0
Kniha
7th Meeting on Chemistry and Life 2018. Book of abstracts
Edice
Ing. Petr Dzik, Ph.D.
Strany od
34
Strany do
34
Strany počet
159
Plný text v Digitální knihovně
BibTex
@misc{BUT150031,
author="Silvestr {Figalla}",
title="Anhydrous ethyl lactate synthesis by transesterification of oligomeric lactic acid",
booktitle="7th Meeting on Chemistry and Life 2018. Book of abstracts",
year="2018",
series="Ing. Petr Dzik, Ph.D.",
edition="1",
pages="34--34",
address="Brno",
isbn="978-80-214-5488-0",
note="Abstract"
}