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Biodiesel is a renewable and clean energy,we use refined Jatropha curcas oil as raw material,and phosphoric acid as a catalyst in the experiment to study the esterification reaction conditions such as alcohol-oil ratio、catalyst amount、reaction temperature、reaction time on the yield of methyl ester effects.That is fatty acid methyl esters after reaction products were washed,dehydrated and filtered.Compared with the catalytic effect of sulfuric acid,we find the the advantages of phosphoric acid