Methyl methacrylate synthesis process

Abstract

The invention discloses a methyl methacrylate synthesis process comprising the steps: carrying out condensation reaction on the reaction raw materials, liquefying and separating out a mixture of methanol and methyl acetate, circulating, separating out a mixture of methanol and methyl acrylate, carrying out hydrogenation reaction to obtain a mixture of methanol and methyl propionate, carrying out areaction on the mixture with a formaldehyde source, liquefying a reaction product gas flow, separating out a mixture of methanol and methyl propionate to obtain a methanol-free MMA crude product liquid, separating the mixture of methanol and methyl propionate, and respectively circulating. According to the method, the mixture of methanol and methyl acetate, the mixture of methanol and methyl acrylate and the mixture of methanol and methyl propionate are gradually separated in an azeotropic manner, so that the energy consumption of methanol separation circulation is reduced; methanol and methyl acrylate azeotrope is used as a raw material to be fed into a hydrogenation reactor, so that the separation difficulty is reduced; formaldehyde is separated from the methanol-free MMA crude productliquid, and the difficulty of further refining is lower; the separation problem of a methanol-containing multi-component complex easily-polymerized system is effectively solved, and a powerful supportis provided for MMA synthesis of a methyl acetate route.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a methyl methacrylate synthesis process. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material, widely used in the production of organic glass (PMMA), PVC additives, coatings and other fields. In recent years, the global MMA production capacity has continued to grow, reaching nearly 5 million tons at present. China’s MMA consumption ranks first in the world, with an external dependence of over 60%, and an annual demand growth rate of more than 10%. It is the top ten products with the highest dependence on imports of organic chemicals. one. [0003] The industrial production methods of MMA include acetone cyanohydrin (ACH) method, isobutylene oxidation method, alkene method, etc., among which the traditional ACH method accounts for nearly 70% of the market. The ACH method uses highly toxic hydrocyanic acid and...

AI Technical Summary

Problems solved by technology

[0005] In the condensation of methyl acetate and formaldehyde to produce methyl acrylate or the condensation of methyl propionate and formaldehyde to produce MMA, in order to inhibit the hydrolysis of esters and the side reactions caused, it is usually necessary to add methanol to the reaction system. However, methanol and propionic acid Methyl ester, methyl acetate, methyl acrylate and MMA can form a complex azeotropic system, which brings great difficulties to product separation. This will inevitably require additional process routes for product separation after the completion of the reaction, which is unavoidable during the separation process. Cause product loss and reduce economic benefits

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