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Energies 2012, 5(8), 2683-2691; doi:10.3390/en5082683

Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

1
College of Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
2
Pharmaceutical & Biological Engineering Department, Zibo Vocational Institute, Zibo, Shandong 255314, China
3
Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
*
Author to whom correspondence should be addressed.
Received: 6 June 2012 / Revised: 13 July 2012 / Accepted: 20 July 2012 / Published: 25 July 2012
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Abstract

Oils with high content of free fatty acid (FFA) can be treated by acid esterification where an alcohol reacts with the given oil in the presence of acid catalyst. The investigated parameters include methanol to oil ratio, temperature and amount of catalyst. The optimum conditions for acid esterification which could reduce FFA content in the feedstock to less than 1.88% (acid value 3.76 mg KOH/g waste cooking oil) were 50 °C, 20% methanol to oil ratio (by volume) and 0.4 vol.% H2SO4 after 5 h. However, oil with an acid value of more than 1 mg KOH/g oil cannot meet the alkaline catalyzed transesterification conditions. Under the conditions of NaOH concentration 0.5 N, excess alkali 15%, 60 °C, 40 min, the FFA removal rate for deacidification reached 77.11% (acid value 0.86 mg KOH/g esterified oil). The acid value of deacidification product was reduced below 0.86 mg KOH/g esterified oil, thus meeting the base-catalyzed trans-esterification conditions. View Full-Text
Keywords: biodiesel; deacidification; esterification; free fatty acids; waste cooking oil biodiesel; deacidification; esterification; free fatty acids; waste cooking oil
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ding, J.; Xia, Z.; Lu, J. Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production. Energies 2012, 5, 2683-2691.

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