TY - JOUR AB - A two-step process consisting of pre-esterification and transesterification was developed to produce biodiesel from crude Jatropha curcas L oil. The free fatty acids (FFAs) in the oil were converted to methyl esters in the pre-esterification step using sulfuric acid or solid acid prepared by calcining metatitanic acid as catalysts. The acid value of oil was reduced from the initial 14 mg-KOH/g-oil to below 1.0 mg-KOH/g-oil in 2 h under the conditions of 12 wt% methanol, 1 wt% H(2)SO(4) in oil at 70 degrees C. The conversion of FFAs was higher than 97% at 90 degrees C in 2 h using 4 wt% solid acid and a molar ratio of methanol to FFAs of 20:1. Phospholipid compounds were eliminated during pre-esterification and a separate degumming operation was unnecessary. The yield of biodiesel by transesterification was higher than 98% in 20 min using 1.3% KOH as catalyst and a molar ratio of methanol to oil 6:1 at 64 degrees C. (C) 2008 Elsevier Ltd. All rights reserved. AD - Sichuan Univ, Coll Chem Engn, Chengdu 610065, Peoples R China AN - WOS:000265719700017 AU - Lu, H. F. AU - Liu, Y. Y. AU - Zhou, H. AU - Yang, Y. AU - Chen, M. Y. AU - Liang, B. DA - May 21 DO - 10.1016/j.compchemeng.2008.09.012 IS - 5 J2 - Comput Chem Eng KW - jatropha curcas l. oil LA - English N1 - 440sj PY - 2009 SN - 0098-1354 SP - 1091-1096 ST - Production of biodiesel from Jatropha curcas L. oil T2 - Computers & Chemical Engineering TI - Production of biodiesel from Jatropha curcas L. oil UR - ://WOS:000265719700017 VL - 33 ID - 4933 ER -