Method for producing 1,6-dimethyl adipate

Abstract

The invention discloses a method for producing 1,6-dimethyl adipate. The method comprises the following steps of: (1) mixing adipic acid and methanol without adding a catalyst, and performing pre-esterification reaction at the temperature of 80 and 200 DEG C under the gage pressure of between 0.05 and 3 MPa; and (2) conveying materials which are subjected to the pre-esterification reaction to the upper part of a continuous catalytic rectifying tower, and gasifying the dried methanol, conveying to the lower part of the catalytic rectifying tower, allowing the materials which are subjected to the pre-esterification reaction to contact methanol steam in a reverse flow mode in the catalytic rectifying tower and performing esterification reaction further. By the method, the problems of equipment corrosion and pollution which are caused by the utilization of a sulfuric acid catalyst in the conventional process are solved, and the defects of complex processes, large consumption level of the catalyst and the like which are caused by the adoption of two-step or multi-step catalytic esterification are overcome.

Description

technical field [0001] The invention relates to a production method of 1,6-dimethyl adipate, in particular to a production method of dimethyl adipate using solid acid as a catalyst. Background technique [0002] 1,6-Dimethyl adipate is an excellent cold-resistant plasticizer, which can endow products with excellent low-temperature softness, and has certain light-heat stability and water resistance. Dimethyl 1,6-adipate is also an important raw material for organic synthesis and a chemical intermediate, which can be used to produce 1,6-hexanediol through hydrogenation. [0003] At present, the reports on the production method of 1,6-dimethyl adipate include: GB143069 discloses a relatively primitive process method, using concentrated sulfuric acid as a catalyst, and adopting a tank reactor reaction distillation method to remove water. The use of inorganic liquid acid as a catalyst has environmental pollution problems such as corrosion of equipment by the inorganic liquid aci...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a kind of production method of 1,6-dimethyl adipate, and the present invention overcomes the equipment corrosion and pollution problem that traditional technology utilizes sulfuric acid catalyst to bring, and adopts two or more steps One-step catalytic esterification causes complex process and large consumption of catalyst, etc.

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