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Biodiesel (FAME) Productivity, Catalytic Efficiency and Thermal Stability of Lipozyme TL IM for Crude Palm Oil Transesterification with Methanol

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Journal of the American Oil Chemists' Society

Abstract

Crude palm oil (CPO) transesterification with methanol at room temperature is an important factor for optimizing biodiesel processing costs with respect to energy input; in addition, good stability of expensive lipase activity was ensured and is reported in this study. The enzyme loading, agitation speed and reaction time at a constant operating temperature of 30 °C were studied to find favourable operational conditions using a factorial design. Statistical analysis was used to assist the enzymatic transesterification so that a reduced mass transfer effect was achieved to obtain high FAME yields. The combination of optimum enzyme loading of 6.67 wt% and 150 rpm agitation speed for the system at 30 °C gave 81.73% FAME yield at 4 h and a production rate of 85.86% FAME yield/h. The high viscosity of CPO observed at 30 °C compared to 40 °C hindered the achievement of 96.15% FAME yield at room temperature. It was found that an increase of 10 °C invariably deactivated the lipase, but was compensated by the enhanced FAME production rate with 96.15% FAME yield after only 4 h reaction time. Thus, 40 °C was considered the most suitable operating temperature for lipozyme TL IM to catalyze CPO transesterification.

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Acknowledgments

The authors express their gratitude to the Ministry of Science, Technology and Innovation (MOSTI), Malaysia, for their financial support of the postgraduate study and project funding through the National Science Fellowship and Science Fund (project no. 02-01-05-SF0122). The research university grant (project no. 1001/PJKIMIA/814004) and research university postgraduate research grant scheme (project no. 1001/PJKIMIA/8031036) awarded by Universiti Sains Malaysia are also appreciated. Khor Guat Kheng from the School of Chemical Engineering, Universiti Sains Malaysia (USM), is kindly acknowledged for her technical support.

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Correspondence to Azlina Harun Kamaruddin.

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Sim, J.H., Kamaruddin, A.H. & Bhatia, S. Biodiesel (FAME) Productivity, Catalytic Efficiency and Thermal Stability of Lipozyme TL IM for Crude Palm Oil Transesterification with Methanol. J Am Oil Chem Soc 87, 1027–1034 (2010). https://doi.org/10.1007/s11746-010-1593-y

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  • DOI: https://doi.org/10.1007/s11746-010-1593-y

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