Studies On The New Synthesis Technics Of Biodiesel

In this thesis, Fe3O4/P2O5/CaCl2 and MoO3/CaCl2 complex system were proposed for the first time as catalyst for biodiesel synthesis in high-pressure reactor. And KOH/CaCl2 was applied as catalyst in the transesterification of sheep oil and methanol. The results of the research are as follows:(1) Fe3O4/P2O5/CaCl2 was applied in the esterification of oleic acid and methanol, at the reaction condition of 135℃, pressure 0.5MP, methanol/oil molar ratio 6:1,catalyst amount 1wt.%, reaction time 1h, the conversion of oleic acid is up to 95%.(2) MoO3/CaCl2 was applied in the esterification of oleic acid and methanol, at the reaction condition of 140℃, pressure 0.5MP, methanol/ oil molar ratio 9:1, catalyst amount 1.5wt.%, reaction time 1h, the conversion of oleic oil is up to 95%.(3) MoO3/CaCl2 and KOH were both applied in the transeste-rification of waste cooking oil and methanol. Firstly, using MoO3/CaCl2 as catalyst, under the reaction conditions of 100℃, methanol/oil mass ratio 1.75:1, catalyst amount 2wt.% and reaction time 2h, the acid value of the waste oil was decreased from 118.87mg KOH/g to 0.98 mg KOH/g. And then using KOH as catalyst, under the reaction conditions of reaction temperature 70℃, methanol/oil mass ratio 0.4:1, catalyst amount 1wt.%, reaction time 0.5h, the fatty acid methyl ester (FAME)yield is up to 90%.(4) Fe3O4/P2O5/CaCl2 was applied in the transesterification of castor oil and methanol, at the reaction condition of 150℃, methanol/oil mass ratio 1.5:1,catalyst amount 2wt.%, reaction time 5h, the fatty acid methyl ester (FAME) yield is up to 87%.(5) KOH/CaCl2was applied in the transesterification of sheep oil and methanol at the reaction conditions of reaction temperature 150℃, methanol/oil mass ratio 1:1, catalyst amount 2wt.%, reaction time 5h, the fatty acid methyl ester (FAME) yield is up to 83%.