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CHLORELLA BIODIESEL PREPARATION CATALYZED BY HETEROPOLYANION-BASED IONIC LIQUID

The reaction conditions of transesterification during Chlorella biodiesel preparation using three heteropolyanion-based ionic liquid [Hmim]4PMo11VO40, [Hmim]5PMo10V2O40 and [Hmim]6PMo9V3O40 as catalysts were studied. The result showed that the best conditions of transesterification were as follows: the molar ratio of methanol to the microalgae oil was 9:1, the reaction time was 7h, the reaction temperature was 70 o C and the dosage of the catalyst accounted for 7% of the mass of the microalgae lipid. Under this condition, the yield of biodiesel reached 69.4%, 72.2% and 75.0%, respectively. Among three catalysts, the ranking of catalytic efficiency was [Hmim]4PMo11VO40 < [Hmim]5PMo10V2O40 < [Hmim]6PMo9V3O40.