Preparation of bio-diesel from Cornus wilsoniana fruit oil with basic ionic liquids as catalyst

Based on chemical composition analysis of Cornus wilsoniana fruit oil,and adopting the new alkaline ionic liquid to catalyze the Cornus wilsoniana fruit oil,the synthesis technology of bio-diesel from C.wilsoniana fruit oil catalyzed with 1-butyl-3-methylimidazolium hydroxide(\OH) was studied.The results show that C.wilsoniana fruit oil was an ideal biodiesel feedstock,and 1-butyl-3-methylimidazolium hydroxide(\OH) is a new catalyst with high activity and stability.The optimal parameters of bio-diesel processing were determined as follows: molar ratio of methanol to fruit oil,catalyst dosage,reaction temperature and reaction time were 6∶1,0.9%,60℃ and 70 min,respectively.Under these conditions,the yield of mixed methyl ester was up to 96.42%.The ionic liquid\OH could be reused for 6 times without any disposal and the yield of mixed methyl ester remained above 90%.