Method for synthesizing methyl propionate through homogeneous hydrogen esterification of ethylene

Abstract

The invention discloses a method for synthesizing methyl propionate through homogeneous hydrogen esterification of ethylene, which comprises the following step: carrying out hydrogen esterification onraw materials ethylene, carbon monoxide and methanol in the presence of a palladium main catalyst, a metal ion cocatalyst, an acidic assistant and a ligand organic diphosphorus compound to synthesizemethyl propionate. According to the method for synthesizing methyl propionate through homogeneous hydrogen esterification of ethylene, a bimetallic catalyst is used, so that the reaction activity andselectivity of a catalytic system are improved, and ethylene hydrogen esterification can be efficiently catalyzed to synthesize methyl propionate at lower temperature and pressure; by adding the organic diphosphine ligand, the activity of the palladium catalyst is improved, the space-time yield of synthesizing methyl propionate through hydrogen esterification of ethylene is greatly improved, themaximum space-time yield reaches 15.43 mol.L<-1> h<-1>, and the good commercial value is achieved.

Description

technical field

[0001] The invention belongs to the technical field of organic chemical products synthesized by ethylene hydroesterification, and in particular relates to a method for synthesizing methyl propionate by homogeneous hydroesterification of ethylene. Background technique

[0002] As an excellent additive, methyl propionate is now widely used as a solvent and preservative for high-grade food and cosmetics; various propionates, such as calcium propionate and sodium propionate, can be prepared through saponification. It is widely used as an antiseptic additive for food and feed to replace the current preservatives such as sodium benzoate. As the basic raw material of organic synthesis industry, methyl propionate can be used to artificially synthesize ethyl propionate, benzyl propionate, isopentyl propionate, benzoate propionate and other advanced non-toxic artificial flavoring agents through transesterification , used in the production of wine industry and essence ...

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