Process for room-temperature ion liquid-catalytic preparation of ethyl linoleate

Abstract

This invention relates to a method of ion liquid through catalysis preparing linoleic acid ethyl ester at room temperature. The invention takes linoleic acid and absolute ethyl alcohol as raw material, use 1 - alkyl- 3 - methyl glyoxaline tetra- fluoborate ion liquid through catalysis to preapre linoleic acid ethyl ester. The invention mix the linoleic acid and absolute ethyl alcohol according to mol ratio of 1 : 2 to 10, then add ion liquid catalyst 1-ethyl-3-methylimidazolium fluoborate or 1-octyl-3-methylimidazolium tetrafluoroborate about 5 to 60% linoleic acid quality to the mixture, whip and heat under nitrogen shield, takes reaction 2 to 10 hours at 40 DEG C circumfluence temperature,then decant upper offspring, takes underpressure rectification at minus 98.6 to minus 99.2kpa, collect fraction of 158 to 171 DEG C, gain refined linoleic acid ethyl ester product. The method of the invention is used for sythesizing ethyl linoleate.

Description

Technical field:

[0001] The invention relates to a method for preparing ethyl linoleate, in particular to a method for preparing ethyl linoleate by catalyzing the esterification of linoleate with room temperature ionic liquid. Background technique:

[0002] Ethyl linoleate (9,12-octadecadienoic acid ethyl ester) is the main drug raw material for the prevention and treatment of heart and brain thrombosis, arteriosclerosis and other diseases. It has the functions of enhancing the body's immunity and regulating metabolism. It has been widely used in food and food fields.

[0003] The industrialized method of producing ethyl linoleate is the esterification reaction of linoleic acid and absolute ethanol under the catalysis of concentrated sulfuric acid. This method not only has problems such as large amount of acid waste water discharge and serious corrosion of production equipment, but also due to the strong oxidizing property of concentrated sulfuric acid, the unsaturated bon...