Biodiesel Preparation from Soybean Oil Catalyzed by LDO

In order to solve the problem of separation between product and catalyst in process of biodiesel transesterification,Mg-Al mixed oxides were prepared.Mg-Al mixed oxide catalyst was used for soybean oil and methanol transesterification reaction to produce biodiesel.Through variation the reaction temperature,methanol to oil molar ratio,catalyst amount,reaction time,the preparation process was optimized in terms of biodiesel yield.The results showed that Mg-Al mixed oxide can be used for biodiesel transesterification process by the soybean oil with methanol as raw materials and when it was used for soybean oil and methanol transesterification reaction to produce biodiesel,the near optimum preparation conditions are: Reaction temperature 65 ℃,reaction time 3 h,reaction of methanol to oil ratio of 9∶1,4% of the amount of catalyst.The yield of biodiesel is 96.25%.