Abstract
Deacidification is a dispensable procedure prior to alkali catalyzed transestrification of acidic oil for biodiesel production. In this study, effect of microwave irradiation on sulfonated granular activated carbon (SGAC) catalyzed deacidification of acidic oil was evaluated. Process variables of deacidification were optimized using response surface methodology (RSM). Results showed that microwave irradiation could enhance deacidification efficiency in comparison with conventional heating and a significant mathematical model was obtained to predict deacidification rate of acidified oil catalyzed by SGAC under microwave heating. Optimum process variables were achieved according to the mathematical model, they were reaction temperature 65 °C, methanol to oil ration 2 (wt/wt), and catalyst loading 5.0% (wt% oil mass). Finally, the optimum process variables were confirmed by experiments, in which average deacidification rate of 93.26% was obtained.
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