TY - JOUR AB - Waste cooking oil (WCO) was used to produce biodiesel in a microtube reactor. First, the acid value of the WCO was reduced from 3.96 mg KOH/g to less than 1 mg KOH/g via acid catalyzed esterification. The effects of the methanol-to-WCO molar ratio (4.5:1-18:1), the H2SO4 concentration (0.5-2 wt.%), reaction temperature (55-70 degrees C), and reaction time (5-20 s) were studied. The optimal conditions were 9:1 methanol-to-WCO molar ratio, 1 wt.% H2SO4, 65 degrees C and 5 s of reaction time. Triglycerides in the product from the first step were transesterified with methanol and alkaline catalyst. Methyl ester content of the biodiesel was 91.76%. (C) 2012 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. AD - Kasetsart Univ, Dept Chem Engn, Fac Engn, Ctr Excellence Petrochem & Mat Technol, Bangkok 10900, Thailand AN - WOS:000312764700004 AU - Tanawannapong, Y. AU - Kaewchada, A. AU - Jaree, A. DA - Jan 25 DO - 10.1016/j.jiec.2012.07.007 IS - 1 J2 - J Ind Eng Chem KW - biodiesel LA - English N1 - 060go PY - 2013 SN - 1226-086x SP - 37-41 ST - Biodiesel production from waste cooking oil in a microtube reactor T2 - Journal of Industrial and Engineering Chemistry TI - Biodiesel production from waste cooking oil in a microtube reactor UR - ://WOS:000312764700004 VL - 19 ID - 9364 ER -