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Keywords:

  • Biodiesel;
  • Glycerolysis of biodiesel;
  • Linseed oil;
  • Mono-acylglycerols;
  • Transesterification

Abstract

Here we investigate the production and characterization of mono-acylglycerols through the glycerolysis of biodiesel, a methyl ester mixture, obtained from linseed oil. The biodiesel employed was derived from linseed oil through transesterification according to transesterification double step process 1. The efficiency of H2SO4, CaO, and NaOH as catalysts was evaluated for the production of mono-acylglycerols. The glycerolysis reactions were performed by varying the molar ratio of the reagents (biodiesel:glycerol), the type and amount of catalyst, reaction time and temperature. Systematic evaluation of reaction yield is shown as a function of these parameters. Reaction products were characterized through IR spectroscopy, hydrogen NMR, and the GC techniques. The study of three different catalysts indicated that the most efficient was 5% NaOH in a 1:5 biodiesel–glycerol molar ratio with 10 h reaction time. The reaction reached a maximum of 85% biodiesel conversion with a mono-acylglycerol yield of 72% at 130°C.