Volume 101, Issue 1 p. 93-100
Article

Biodiesel production from high acid value waste frying oil catalyzed by superacid heteropolyacid

Fenghua Cao,

Fenghua Cao

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Yang Chen,

Yang Chen

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Fengying Zhai,

Fengying Zhai

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Jing Li,

Jing Li

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Jianghua Wang,

Jianghua Wang

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Xiaohong Wang,

Corresponding Author

Xiaohong Wang

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759.Search for more papers by this author
Shengtian Wang,

Shengtian Wang

Key Laboratory of Polyoxometalate, Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China; telephone: 86-431-88930042; fax: 86-431-85099759

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Weimin Zhu,

Weimin Zhu

Institute of Mechanical Science and Engineering, Jilin University, Changchun, PR China

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First published: 07 March 2008
Citations: 109

Abstract

Transesterification of waste cooking oil with high acid value and high water contents using heteropolyacid H3PW12O40·6H2O (PW12) as catalyst was investigated. The hexahydrate form of PW12 was found to be the most promising catalyst which exhibited highest ester yield 87% for transesterification of waste cooking oil and ester yield 97% for esterification of long-chain palmitic acid, respectively. The PW12 acid catalyst shows higher activity under the optimized reaction conditions compared with conventional homogeneous catalyst sulfuric acid, and can easily be separated from the products by distillation of the excess methanol and can be reused more times. The most important feature of this catalyst is that the catalytic activity is not affected by the content of free fatty acids (FFAs) and the content of water in the waste cooking oil and the transesterification can occur at a lower temperature (65°C), a lower methanol oil ratio (70:1) and be finished within a shorter time. The results illustrate that PW12 acid is an excellent water-tolerant and environmentally benign acid catalyst for production of biodiesel from waste cooking oil. Biotechnol. Biotechnol. Bioeng. 2008;101: 93–100. © 2008 Wiley Periodicals, Inc.

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