TITLE:
Kinetics and Mechanism of the Uncatalyzed Esterification of Acid-Rich Oil with Glycerol
AUTHORS:
Ke Li, Jie Chen, Xiaoan Nie, Jianchun Jiang
KEYWORDS:
Oil, Fatty Acid, Esterification, Kinetics, Reaction Mechanism
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.12 No.1,
January
5,
2022
ABSTRACT: In this
paper, non-catalytic high temperature deacidification process of glycerol rich
in acid oil was studied. Through orthogonal experiment, the primary and
secondary order of influencing factors was temperature, glycerol dosage and
reaction time, and the optimal process conditions were further verified: The
ratio of fatty acid to glycerol is 1:1.2, the reaction temperature is 240°C,
and the acid value can be reduced to 1.66 mg KOH/g for 2 h. In addition, the activation energy of the reaction was
54.93 kJ/mol by kinetic study. Combined with the K1 value of each reaction, it was confirmed that the
temperature rise was conducive to the progress of the reaction. Finally, the high temperature ionization theory of glycerol is put
forward, and the mechanism of auto-catalyzed deacidification reaction of
glycerol is deduced by using this theory. This theory not only explains this study, but also perfectly explains the
slow reaction time of low glycerol dosage.