Method for synthesizing biodiesel with high cetane number and catalyst thereof

Abstract

The invention relates to a method for synthesizing biodiesel with high cetane number by catalyzing one step ester exchange of highly unsaturated fat and hydrogenation reaction, and catalyst thereof. Bifunctional catalyst alkaline earth metallic oxide loading copper oxide is prepared by chemisorption hydrolysis together with vacuum calcination with alkaline earth metallic oxide prepared by vacuum calcination as the carrier. The method includes the following steps: adding unsaturated fat, lower alcohol and catalyst to a high pressure reactor and mixing up based on the alcohol-fat molar ratio of 6-36:1 and fat-catalyst weight ratio of 1:0.01-1:0.1; filling nitrogen and hydrogen in turn to change the gas in the high pressure reactor, then sealing the reactor for heating and mixing; as the temperature rises to 150-220 DEG C, filing 1-10MPa hydrogen; after 2-20h of reaction, removing the solid catalyst of the reaction product by filtration, separating the glycerol layer, evaporating alcohol and finally getting biodiesel which contains single unsaturated oleic acid ester transformed from polyunsaturated low carbon ester with high cetane number over 51 and other properties that meet German Standard, such as low temperature liquidity and antioxidation stability.

Description

technical field

[0001] The invention relates to a synthesis method and catalyst for synthesizing high cetane number biodiesel from highly unsaturated animal and vegetable oils, and specifically discloses a preparation method of a bifunctional catalyst that catalyzes a one-step transesterification reaction and a selective hydrogenation reaction. It catalyzes a synthetic method for synthesizing high cetane number biodiesel through one-step transesterification reaction and selective hydrogenation reaction of highly unsaturated animal and vegetable oils. Background technique

[0002] Biodiesel is a clean and safe new fuel that uses renewable biomass such as animal and vegetable oils to replace petrochemical diesel. Its main components are fatty acids formed from long-chain saturated and unsaturated fatty acids with 14 to 22 carbons and low-carbon alcohols Esters, mainly fatty acid methyl esters. With the increasing shortage of petrochemical resources and the gradual enhancement...