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A heterogeneous acid‐catalyzed process for biodiesel production from enzyme hydrolyzed fatty acids
Author(s) -
Su ChiaHung,
Fu ChunChong,
Gomes James,
Chu IMing,
Wu WenTeng
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11377
Subject(s) - catalysis , biodiesel production , methanol , chemistry , biodiesel , hydrolysis , molar ratio , reaction rate , transesterification , mole fraction , organic chemistry , chemical engineering , engineering
In this work, biodiesel synthesis via fatty acids esterification with methanol is conducted by using a heterogeneous catalyst made from cation‐exchange resin. The kinetics of esterification is studied at the different levels of catalyst loading (3.65–53.6%, w/w), reaction temperature (333–353 K) and molar ratio of methanol to fatty acids (1:1 to 20:1). The reaction rate and fatty acids conversion increased with increases in catalyst loading, reaction temperature and molar ratio of feeding reactants. A pseudo‐homogeneous kinetic model coupling the effect of catalyst loading, reaction temperature and methanol/fatty acids molar ratio used for describing the process gave a correlation coefficient of 0.95 between experimental and predicted data. The proposed model was further used to predict the optimal operating condition for obtaining equilibrium conversion of 0.99. A reaction temperature of 372.15 K, molar ratio of feeding reactants of 14.9:1 and reaction time of 9.5 h was numerically calculated as the optimal operating condition. Under this optimal operating condition, an experimental verification was carried out and a satisfactory match was observed between experimental data and model prediction. © 2007 American Institute of Chemical Engineers AIChE J, 2008