Synthesis and characterization of mono‐acylglycerols through the glycerolysis of methyl esters obtained from linseed oil |
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Authors: | Gracélie A S Schulz Kelly C da Silveira Daniela B Libardi Maria do Carmo R Peralba Dimitrios Samios |
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Affiliation: | Centre for Fuels Biofuels Lubricants and Oils ‐ CECOM, Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gon?alves, Porto Alegre, Brazil |
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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. |
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Keywords: | Biodiesel Glycerolysis of biodiesel Linseed oil Mono‐acylglycerols Transesterification |
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