Frontiers of Chemical Science and Engineering
>> 2007,
Volume 1,
Issue 1
doi:
10.1007/s11705-007-0003-y
Biodiesel production by the transesterification of cottonseed oil by solid acid catalysts
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
Available online: 2007-03-05
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Abstract
Methyl esters (biodiesel) were produced by the transesterification of cottonseed oil with methanol in the presence of solid acids as heterogeneous catalysts. The solid acids were prepared by mounting HSO on TiO · nHO and Zr(OH), respectively, followed by calcining at 823K. TiO-SO and ZrOSO showed high activity for the transesterification. The yield of methyl esters was over 90% under the conditions of 230°C, methanol/oil mole ratio of 12:1, reaction time 8 h and catalyst amount (catalyst/oil) of 2% (w). The solid acid catalysts showed more better adaptability than solid base catalysts when the oil has high acidity. IR spectral analysis of absorbed pyridine on the samples showed that there were Lewis and BrØnsted acid sites on the catalysts.
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