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Alcoholysis of waste frying oil (WFO) was studied by using microwave irradiation to examine alcoholization reaction factors which affect the purity of the ester product, including the molar ratio of methanol to WFO, the amount of alkaline catalyst and the reaction time. The alcoholysis reactions were carried out by using WFO, methanol and sodium hydroxide as the catalysts at 64 °C. In order to characterize...