The transesterification of waste oil with high acid value and methyl acetate to biodiesel catalyzed by the immobilized lipase Novozym 435 was explored.

To explore the transesterification of waste oil with high acid value and methanol catalyzed by immobilized Candida Antarctica lipase to synthesize biodiesel,the effects of the molar ration of substrate,water,and free fatty acids in the reaction system on the tranesterification were studied.

Transesterification of waste oil with high acid value to produce biodiesel catalyzed by defatted wheat germ powder

So far it is practical to use high acid value oils and fats raw materials to reduce the cost of bio-diesel.

Esterification of high acid value oil with stannic chloride catalyst;

Methyl esterification of high acid value oil catalyzed by p-toluene sulphonie acid;