Research On Preparation Of Corn Oil-based Biodiesel Based On Heterogeneous Catalysis

Biodiesel is fatty acid methyl ester or ethyl ester, which is made by plant, animal oils or long chain fatty acids react with short chain alcohols such as methanol in the presence of catalysts, and biodiesel is a renewable energy source; biodiesel has similar physical and chemical properties of diesel, so it is considered as one of the best replacement of diesel, so research on it has became a hotspot for domestic and foreign scholars in recent years.In this paper, we use a new transesterification reagent called MC reacts with corn oil through transesterification to produce biodiesel, and there is no glycerin detected by GC during the preparation. Firstly, quantitative analysis method is established by gas chromatography for corn oil-based biodiesel and glyceride, and this method can not only be used for calculation of yield and conversion rate, but also for kinetic studies, which means this method can determine the amount of biodiesel and glycerol in the reaction system. Secondly, when potassium hydroxide as the catalyst, pre-pressed corn oil as feedstock, MC for the transesterification reagent, synthesis conditions of biodiesel are optimized through response surface methodology:react at MC reflux temperature for 9h, molar ratio of ester to oil is 9:1, KOH concentration is 16.25%, the yield reaches 90.43%. When use this condition for the leaching corn oil, the yield is 90.80%. Moreover, transesterification kinetics is studied for MC reacts with pre-press corn oil in the presence of KOH, and the reaction rate equation and kinetic parameters are determined. Finally, transesterification of pre-pressing corn oil and MC in the presence of Novozym435 was studied. When reaction temperature at 60℃, molar ratio of ester to oil is 10:1, catalyst amount at 20wt%, reaction time is 24h, the yield can reach 95.4%. When use this condition for the leaching corn oil, the yield is 95.00%.