The preparation of alkyl esters from highly unsaturated triglycerides. II

Abstract

A previously described procedure for the basecatalyzed alcoholysis of fish‐oil triglycerides with alcohols of low molecular weight has been applied to the preparation of alkyl esters using high molecular weight, aromatic, and terminally unsaturated alcohols. Some monoethers of ethylene‐and diethylene glycol have also been used in this work. Thin‐layer chromatography was used to follow the course of the reaction and determine optimum reaction times and yields of products.

Conversion of oils and fats using advanced mesoporous heterogeneous catalysts

“…Homogeneous alkali catalysts (e.g., NaOH, KOH) have primarily been used for the transesterification of TG (59)(60)(61)(62). However, as the demand for alkyl esters (e.g., biodiesel) increases, there is interest in improving the production process.…”

Studies on the transesterification of glycerides: I. The methanolysis of tripalmitin catalysed by diorganotin(IV) compounds

“…However, Bradshaw and co-workers, 21 in studies on vegetable oils using alkali catalysts, have reported that practical conversion yields of 98% can only be achieved with a molar ratio of 4.8:1. Others, in particular Feuge and Gros 22 and Lehman and Gauglitz, 23 have advocated a 6:1 molar ratio; molar ratios higher than this, according to these authors, tended to hamper recovery of ester and glycerol. In this study, which was also aimed at understanding the mechanism of the tripalmitin conversion, we have used an excess of the methanolic reagent so as to simplify the kinetics as well as favouring the equilibrium towards product (methyl palmitate) formation.…”

“…The calculated values of [TP] 0 obtained using Eqn [23] at different times during the course of the reaction are compared in Table 4. The near-constancy of the values attests strongly to a mechanism for the methanolysis reaction based on the consecutive reaction pathway.…”