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Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume 41, Number 10, November/December 2003, pp. 560-563
An Automated Transesterification Technique for Quantitation
of Acid Precursors of Ester-Based Oils
Birbal Chawla
ExxonMobil Research & Engineering Company, Paulsboro Technical Center,
Paulsboro, NJ 08066
A novel automated transesterification (ATE) technique has been
developed for the quantitative determination of acid components used in synthesizing
ester-based oils. The ATE technique has been successfully tested over a period
of more than five years using several commercially available ester-based new
and used refrigeration oils and jet oils. In this automated technique, the
ester-based oil is transesterified using a commercially available SAP-Ester
kit, and the resulting methyl ester mixture is then extracted and analyzed
by gas chromatography (GC). During the transesterification, the large number
(50–100) of oil-ester components are significantly reduced to a much
smaller group of easily resolvable and quantitatable methyl esters (mostly < 6,
depending upon the number of acids used).
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