Abstract
Soybean acid oil (SAO), a by-product of soybean oil refining, contains large amounts of free fatty acids (FFAs). In the present work, the esterification of FFAs in SAO with methanol over four strong acid cation-exchange resins to synthesize biodiesel was studied in a batch reactor. The effects of external and internal diffusion, catalyst amount, methanol/FFAs ratio, and temperature in the esterification over the optimal resin (LS-50) were assessed. After 140 min, the esterification reached equilibrium, and high FFAs conversion (91.02 %) was obtained under the optimized conditions. Based on the obtained data, the reaction kinetics was studied, and the kinetics of the optimized FFAs esterification catalyzed by LS-50 fitted well to the pseudo-homogeneous (P–H) kinetic model. LS-50 could be successfully reused for at least 8 cycles, and its deactivation mechanism was also investigated. The fuel property parameters of the synthesized biodiesel conformed to the standards for biodiesel in the US (ASTM D 6751-03).
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Financial supports from China’s National Natural Science Foundation (No. 21076046) and (No. 21066002) are gratefully acknowledged.
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Hu, X., Wei, T., Liao, A. et al. Use of acid cation-exchange resin for catalytic conversion of soybean acid oil to biodiesel. J Mater Cycles Waste Manag 18, 123–131 (2016). https://doi.org/10.1007/s10163-014-0317-z
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DOI: https://doi.org/10.1007/s10163-014-0317-z