Investigation on the Catalytic Transesterification of Rapeseed to Prepare Biodiesel in Microwave-Ionic Liquid System

Biodiesel is an alternative energy for fossil fuel with advantages of good performance of combustion and recycling,which has been highly investigated produced in large scale in developed countries.The rapid method of preparation of biodiesl was studied with rapeseed oil and methanol catalyzed with ionic liquid under microwave irradiation.Factors influencing on yield of biodiesel were investigated following the microwave power,the microwave irradiation time,the dosage of ionic liquid,the amount of NaOH and the mass ratio of methanol to oil.Results showed that microwave and ionic liquid had synergetic effect on transesterification.Ionic liquid has the effects of catalysis and solubilization,which can eliminate the interface of methanol and oil,and it also can reduce the saponification and improves efficiency of transesterification.Microwave can also improve the transesterification efficiency for its thermal and non-thermal effect.The yield was 84.6% under the conditions of 100 g rapeseed oil,15.0 mL methanol,1.5 g BF4,0.6 g NaOH under microwave irradiation for 10 min with 800 W at 2.45 GHz at 65 ℃