Comparison of membrane extraction with traditional extraction methods for biodiesel production |
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Authors: | H Y He X Guo S L Zhu |
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Affiliation: | (1) Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China |
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Abstract: | Three traditional methods for the refining step in biodiesel production were compared: (i) washing with distilled water; (ii)
washing with acid (HCl); and (3) dissolving and extracting in a solvent (hexane or petroleum ether) and then washing with
distilled water. Biodiesel with a high purity (97.5%) could be obtained by all three methods, but serious emulsification occurred
during the refining processes, which led to high refining losses. A novel refining method was developed by using hollow fiber
membrane extraction, and polysulfone was selected as the most suitable membrane. This process effectively avoided emulsification
during refining and decreased the refining loss. The purity of the biodiesel obtained was about 99%; and other properties,
such as density, kinematic viscosity, water content, and acid value, conformed to the standards. |
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Keywords: | Biodiesel hollow fiber extraction production refining transesterification |
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