Preparation of waste cooking oil based biodiesel using microwave irradiation energy

摘要

This study was carried out for manufacturing biodiesel from WCO using microwave assisted-trans-esterification reaction, and the efficiency of the original and new methods was compared. The biodiesel fuel properties such as fatty acid methyl ester (FAME) content, higher heating value (HHV), and kinematic viscosity (KV) of six acid value WCO based biodiesel were analyzed. Six WCO was divided into low acid value group (LAVG) and high acid value group (HAVG) by the optimal biodiesel manufacturing condition. At a molar ratio of methanol/WCO (8) and reaction time (6 min), the maximum FAME contents for LAVG and HAVG were obtained at a microwave power and catalyst amount of 500 Wand 1.0 wt%, and 600 Wand 1.2 wt %, respectively. A biodiesel was manufactured from WCO below domestic acid value (2.5 mg KOH/g) using microwave, saving time and energy in comparison with the existing method. As the acid value increased, more catalyst amount, microwave power, reaction time, and molar ratio of alcohol/WCO were needed. Therefore, biodiesel using commercial WCO can be produced without pretreatment process. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.