Author(s): Awad S, Paraschiv M, Varuvel EG, Tazerout M, Awad S, Paraschiv M, Varuvel EG, Tazerout M
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Abstract Animal fat residues (AFR) from waste water were used as feedstock to produce biodiesel by a two-step acid-catalyzed process. Treatment of the AFRs with 5.4\% (w/w) of 17 M H2SO4 at a methanol/AFR ratio of 13:1 (50\%w/w) at 60 °C converted more than 95\% of the triglycerides into fatty acid methyl esters (FAMEs) with an acid value (AV) of 1.3 mgKOH/gbiodiesel. Response surface methodology indicated that a lower AV cannot be reached using a one-step acid catalyzed process. Thus a two-step acid catalyzed process was employed using 3.6\% catalyst and 30\% methanol for 5 h for the first step and 1.8\% catalyst and 10\% methanol for 1 h in the second step, resulting in a yield higher than 98\% and an AV of 0.3 mgKOH/gbiodiesel. The product thus conforms to the European norm EN14214 concerning biodiesel. Copyright © 2012 Elsevier Ltd. All rights reserved.
This article was published in Bioresour Technol
and referenced in Journal of Bioprocessing & Biotechniques