Grubbs Catalyst Catalyzes the Complex Decomposition of Methyl Oleate and Ethylene
Using biomass methyl biooleate(MO)as raw material,1-decene and methyl 9-decenoate could be simultaneously prepared by cross-metathesis reaction with ethylene.Firstly,the effects of three commonly used olefin metathesis catalysts on the system were evaluated,and Grubbs 1 was selected as the best catalyst.The conversion rate of methyl oleate and the yield of 1-decene and methyl 9-decenoate were taken as evaluation indexes to explore the process conditions of Grubbs I catalyst.The results showed that when the temperature was 40 ℃,the ethylene pressure was 0.2 MPa,the reaction time was 2 h,the catalyst dosage was 1%of methyl oleate,the solvent was toluene,and the concentration was 0.1 mol/L,the conversion rate of methyl oleate was 97.4%,the yield and selectivity of 1-decene were 97.4%and 100%,respectively,and the yield and selectivity of methyl 9-decenoate were 76.4%and 78.4%,respectively.Then,the process conditions of Grubbs Ⅱ catalyst were explored.When ethylene pressure was 0.5 MPa,temperature was 40 ℃,reaction time was 1 h,and catalyst dosage was 0.5%of methyl oleate,the yield of 1-decene reached 76.4%,the yield of methyl 9-decenoate was 80.1%,and the conversion rate was 92.7%.