Methyl methacrylate synthesis process

A technology of methyl methacrylate and methyl acrylate, applied in the field of methyl methacrylate synthesis technology, can solve the problems of reduced economic benefit, difficult product separation, unavoidable product loss, etc., and achieves reduced separation difficulty and low purification difficulty. Effect

Active Publication Date: 2020-04-10
SOUTHWEST RES & DESIGN INST OF CHEM IND
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methyl methacrylate synthesis process
  • Methyl methacrylate synthesis process
  • Methyl methacrylate synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 shown, including the following steps:

[0028] S1, methyl acetate, formaldehyde, returned methyl acetate and methanol mixture, returned methanol and / or carrier gas enter the first condensation reactor 1 after preheating; methyl acetate and formaldehyde undergo hydroxylation under the action of a condensation catalyst The aldehyde condensation reaction generates a gaseous product stream, which contains methyl acrylate, residual formaldehyde, residual methyl acetate and methyl alcohol introduced to suppress side reactions; the gaseous product stream of the first condensation reactor 1 is cooled and separated from gas and liquid, The liquid phase product contains more than 90% methyl acrylate, residual formaldehyde, residual methyl acetate and methanol in the gaseous product stream;

[0029] S2, the liquid phase product of step (1) gained is sent to the first separation tower 2, methyl acetate and methanol mixture are separated as light components by the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/343C07C67/54C07C69/54
CPCC07C67/343C07C67/54C07C69/54
Inventor 王光永毛震波赵国强贾绘如李军周拥华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products