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Journal of Energy
Volume 2013, Article ID 926392, 10 pages
http://dx.doi.org/10.1155/2013/926392
Review Article

Recent Strategy of Biodiesel Production from Waste Cooking Oil and Process Influencing Parameters: A Review

Department of Chemical Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Naclu 641 014, India

Received 25 February 2013; Revised 11 April 2013; Accepted 22 April 2013

Academic Editor: S. Venkata Mohan

Copyright © 2013 A. Gnanaprakasam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cost of biodiesel produced from virgin vegetable oil through transesterification is higher than that of fossil fuel, because of high raw material cost. To minimize the biofuel cost, in recent days waste cooking oil was used as feedstock. Catalysts used in this process are usually acids, base, and lipase. Since lipase catalysts are much expensive, the usage of lipase in biodiesel production is limited. In most cases, NaOH is used as alkaline catalyst, because of its low cost and higher reaction rate. In the case of waste cooking oil containing high percentage of free fatty acid, alkaline catalyst reacts with free fatty acid and forms soap by saponification reaction. Also, it reduces the biodiesel conversions. In order to reduce the level of fatty acid content, waste cooking oil is pretreated with acid catalyst to undergo esterification reaction, which also requires high operating conditions. In this review paper, various parameters influencing the process of biofuel production such as reaction rate, catalyst concentration, temperature, stirrer speed, catalyst type, alcohol used, alcohol to oil ratio, free fatty acid content, and water content have been summarized.