Abstract
Abstract Compared with five commercial lipases, the whole-cell lipase of Rhizopus chinensis CCTCC M201021 (RCL) showed high catalytic ability in the transesterification of soybean oil to fatty acid methyl ester (biodiesel) in the solvent-free system. The effect of reaction parameters including methanol content, water content, lipase amount, and reaction temperature on transesterification was investigated. The biodiesel yield was more than 86.0% in the solvent-free system under the optimal reaction conditions. The effect of different organic solvents on the transesterification indicated that the best one was n -heptane with higher log P values (4.0–4.5). The whole-cell lipase also proved to be an efficient and potential biocatalyst for biodiesel production from oleic acid and simulant high acid value oil in the solvent-free system.
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