Environmentally-friendly synthesis method of dimethyl adipate

Abstract

The invention discloses a synthesis method of dimethyl adipate. The dimethyl adipate is prepared from methanol and adipic acid which serve as main raw materials by adopting a metal solid-phase catalyst prepared by dual-metal salt coprecipitation. Compared with traditional strong acid catalysts such as sulfuric acid or methylbenzenesulfonic acid, the catalyst can be repeatedly used after being recycled and avoids corrosion of equipment and production of the three types of wastes.

Description

technical field [0001] The invention relates to a green synthesis method of dimethyl adipate, which belongs to the field of chemical synthesis. Background technique [0002] Dimethyl adipate is an important chemical raw material, mainly used as plasticizer and synthesis of 1,6-hexanediol, etc. The traditional process of synthesizing dimethyl adipate uses concentrated sulfuric acid as a catalyst, because sulfuric acid has dehydration and oxidation effects, which leads to many side reactions, and there are also problems of equipment corrosion and three waste pollution. In order to overcome the deficiencies of the sulfuric acid method, in recent years, the use of hydrated sodium bisulfate, p-toluenesulfonic acid, heteropolyacids, solid superacids, etc. as esterification catalysts has been reported, and a good esterification effect has been achieved; However, there are still disadvantages such as the catalyst cannot be recycled and reused, the preparation is difficult, the prod...

AI Technical Summary

Problems solved by technology

The traditional process of synthesizing dimethyl adipate uses concentrated sulfuric acid as a catalyst, because sulfuric acid has dehydration and oxidation, which leads to many side reactions, and there are also problems of equipment corrosion and three waste pollution

In order to overcome the deficiencies of the sulfuric acid method, in recent years, the use of sodium bisulfate hydrate, p-toluenesulfonic acid, heteropolyacids, solid superacids, etc. as esterification catalysts has been reported, and a good esterification effect has been achieved; However, there are still disadvantages such as the catalyst cannot be recycled and reused, the preparation is difficult, the product is not easy to purify, and the industrialization is difficult.

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