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Appl. Sci. 2017, 7(6), 632; doi:10.3390/app7060632

Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents

1
Department of Environmental Engineering, Kongju National University, 1223-24 Cheonan-Daero, Seobuk, Chungnam 31080, Korea
2
Energize Nepal Programme, Kathmandu University, Dhulikhel 45200, Nepal
3
Waste & Biomass Energy Technology Center, Kongju National University, 1223-24 Cheonan-Daero, Seobuk, Chungnam 31080, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Magnus Rydén
Received: 15 May 2017 / Revised: 9 June 2017 / Accepted: 12 June 2017 / Published: 17 June 2017
(This article belongs to the Section Energy)
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Abstract

Transesterification of waste vegetable oil is one of the promising partial substitutes for fossil fuels. The degradation characteristics of waste vegetable oil using supercritical alcohols (ethanol and methanol) have been studied in this research. The elementary target was to conduct comparative analysis of the effect of supercritical methanol and supercritical ethanol as solvents on the transesterification along with the analysis of product obtained in terms of carbon number. The experiments were carried out at transesterification temperatures of 250, 270 and 290 °C, retention time of 0 to 60 min at an interval of 15 min and oil to alcohol molar ratios of 1:6, 1:12 and 1:18 for both alcohols. The conversion increased with increase in transesterification temperature and retention time. At 290 °C, almost 99% conversion was achieved for 60-min holding time for both alcohols. Increase in conversion of waste vegetable oil was observed as the molar ratio increased. Supercritical transesterification resulted into ester yield higher than 95% with non-ester composition and glycerol collectively less than 5%. View Full-Text
Keywords: supercritical transesterification; waste vegetable oil; biodiesel; supercritical methanol; supercritical ethanol supercritical transesterification; waste vegetable oil; biodiesel; supercritical methanol; supercritical ethanol
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MDPI and ACS Style

Karki, S.; Sanjel, N.; Poudel, J.; Choi, J.H.; Oh, S.C. Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents. Appl. Sci. 2017, 7, 632.

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