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Kinetics of the Transesterification of Castor Oil with Maleic Anhydride Using Conventional and Microwave Heating
Author(s) -
Mazo Paula,
Estenoz Diana,
Sponton Marisa,
Rios Luis
Publication year - 2012
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-012-2020-3
Subject(s) - transesterification , castor oil , maleic anhydride , activation energy , catalysis , reaction rate constant , enthalpy , acid value , order of reaction , kinetics , entropy of activation , chemistry , reaction rate , organic chemistry , dielectric , materials science , thermodynamics , biochemistry , physics , quantum mechanics , copolymer , polymer , optoelectronics
The transesterification of castor oil with maleic anhydride was studied using conventional and microwave heating. Reactions were followed by measuring the acid value and the reaction products were characterized by FTIR and 1 H NMR. A kinetic model that fit the experimental data was derived. The transesterification was non‐catalytic and first‐order with respect to each reactant. Non‐thermal effects of microwaves were not observed. Activation energy, enthalpy of activation, entropy of activation and free energy of activation were similar regardless of the heating method. Rate constants and the pre‐exponential factor were lower with the use of microwave heating, which could be a consequence of the decrease in the dielectric constant of the reaction liquid as the reaction progresses.