Method for preparing methyl methacrylate from methyl propionate and formaldehyde

Abstract

The invention provides a method for preparing methyl methacrylate from methyl propionate and formaldehyde. According to the method for preparing the methyl methacrylate from the methyl propionate and the formaldehyde, the fluidized bed reactor and the catalyst regenerator are coupled, so that the problem on the rapid deactivation of the catalyst is solved effectively, and the continuous production is realized. The method achieves important economic benefits.

Description

technical field [0001] The present invention relates to a kind of method for preparing methyl methacrylate, specifically, relate to a kind of novel process method of preparing methyl methacrylate by methyl propionate and formaldehyde, [0002] The reaction equation is as follows: [0003] CH 3 CH 2 COOCH 3 +HCHO=CH 3 CH 2 CHCOOCH 3 +H 2 o [0004] The method includes reacting methyl propionate and formaldehyde in a fluidized bed reactor, while the deactivated catalyst is regenerated in a catalyst regenerator, and the catalyst is circulated between the fluidized bed reactor and the regenerator to ensure continuous and stable Conversion of methyl propionate and formaldehyde. Background technique [0005] Methyl methacrylate is mainly used in the synthesis of plexiglass, PVC additives, coatings, etc., and is an important organic chemical raw material. At present, the production of methyl methacrylate at home and abroad mainly adopts the ACH method, but this method has...

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Problems solved by technology

However, the related patent (99805643.X) shows that the second reaction process uses a fixed-bed reactor, which has the problems of catalyst deactivation and short life.

[0007] In related reports, the device adopts a parallel double fixed bed mode to realize continuous production. The reaction is carried out in one reactor first, and when the catalyst is gradually deactivated to a certain extent, the raw material is switched to another reactor through the valve for reaction, while The regeneration gas is fed into the original reactor to regenerate the catalyst, and this cycle is carried out. However, due to the gradual deactivation of the catalyst, there is a shortcoming of large fluctuations in product concentration, which increases the difficulty and requirements of subsequent separation and purification operations.

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