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The acetolysis of glycerides. I. Preliminary investigation and approximate kinetics
Author(s) -
Meade Edwin M.,
Walder Dilys M.
Publication year - 1962
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/bf02633336
Subject(s) - acetic acid , glyceride , catalysis , chemistry , hydrolysis , acetic anhydride , kinetics , organic chemistry , fatty acid , physics , quantum mechanics
Below 120ŶC., direct acidolysis of fats by acetic acid is vanishingly slow, the observed reaction being a slow hydrolytic fat splitting to partial glycerides followed by a rapid acetylation. Water is an essential reactant, and strong acid catalysis of the reaction is effective only in its presence. The reaction is unimolecular with respect to the acid catalyst, and probably also to the ester linkages, but molecularity falls below unity with respect to water, which has strong effects on acid strengths in an acetic acid medium. The reaction velocity has a temperature coefficient of 1.6 per 10ŶC. over the range 77舑118ŶC. Using a three‐fold weight of 98% acetic acid, 1% of catalyst, and 12舑24 hours' reaction at 100舑118ŶC., fat splits of around 90% can be attained.