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Method for preparing methyl methacrylate by taking methyl acetate as raw material

A technology of methyl methacrylate and methyl acrylate, applied in the field of preparing methyl methacrylate, can solve the problems of high cost and large investment of methyl methacrylate, and achieve the advantages of cheap sources, increased economic benefits and abundant sources. Effect

Inactive Publication Date: 2021-02-26
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrialized production process of domestic methyl methacrylate mainly adopts the acetone-cyanohydrin route (ACH) and the C4 route, and both of them have been localized, but both methods require large investment and the cost of producing methyl methacrylate is high

Method used

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  • Method for preparing methyl methacrylate by taking methyl acetate as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Present embodiment is that the technological process of preparing methyl methacrylate with methyl acetate as raw material sees attached figure 1 , the specific method and experimental results are as follows:

[0025] The molded catalysts were loaded into the condensation reactor one, the condensation reactor two and the hydrogenation reactor respectively, and were all sprayed with H before use. 2 Activation, the activation conditions are: temperature 200°C, normal pressure, gas space velocity 500h -1 , Activation time 6h. Using existing conventional aldol condensation reaction catalysts in the art, as long as the technical effects of the aldol condensation of methyl acetate and formaldehyde and the aldol condensation of methyl propionate and formaldehyde in this embodiment can be achieved.

[0026] 37% industrial-grade dilute formaldehyde enters the formaldehyde concentration unit 1 for concentration, and a part of the concentrated formaldehyde is mixed with methyl ac...

Embodiment 2

[0035] The test and analysis methods are the same as in Example 1, the reaction temperature of condensation reactor one 10 is changed to 350°C, and the reaction temperature of condensation reactor two 2 is changed to 370°C.

[0036] The experimental results are: the conversion rate of methyl acetate is 45%, the selectivity of methyl propionate is 94%; the conversion rate of methyl propionate is 36%, and the selectivity of methyl methacrylate is 87%.

Embodiment 3

[0038] The test and analysis methods are the same as those in Example 1, the pressure of condensation reactor one 10 is changed to 3.0 bar, and the pressure of condensation reactor two 2 is changed to 2.0 bar.

[0039] The experimental results are: the conversion rate of methyl acetate is 62%, the selectivity of methyl propionate is 82%; the conversion rate of methyl propionate is 28%, and the selectivity of methyl methacrylate is 91%.

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Abstract

The invention provides a method for preparing methyl methacrylate by taking methyl acetate as a raw material, and belongs to the field of application of methyl acetate. According to the method, methylacetate and concentrated formaldehyde are used as raw materials, methyl methacrylate is obtained through two-step aldol condensation, hydrogenation and separation and purification, and the method specifically comprises the steps that methyl acetate and concentrated formaldehyde are subjected to aldol condensation to generate methyl acrylate, methyl acrylate is separated through a methyl acetate recovery unit and a methyl acrylate recovery unit and then hydrogenated to obtain methyl propionate, methyl propionate and concentrated formaldehyde are subjected to aldol condensation reaction again,a product and a tower bottom material flow of the methyl acrylate recovery unit are mixed and then enter the formaldehyde recovery unit, and a tower top organic phase material flow of the formaldehyderecovery unit is separated and purified through the dehydration unit, the methyl propionate recovery unit and the refining unit in sequence to obtain a methyl methacrylate (MMA) product. The methyl acetate is rich in source and low in price, and is used as a raw material for producing methyl methacrylate, so that the downstream application of the methyl acetate is widened, and the additional value of the product is increased.

Description

technical field [0001] The invention belongs to the application technical field of methyl acetate, and specifically relates to a method for preparing methyl methacrylate by using methyl acetate as a raw material. Background technique [0002] Methyl acetate is a by-product of the production process of polyvinyl alcohol (PVA for short), and about 1.5 tons of methyl acetate is produced for every ton of polyvinyl alcohol produced. Although methyl acetate is also a kind of chemical raw material, the demand is small, and it is generally not sold as a by-product. At present, most of the industry is to hydrolyze methyl acetate into acetic acid and methanol, and obtain acetic acid and methanol after separation and purification, or as The product is sold, or reused in other processes or for personal use, and the added value of the product is low. [0003] Methyl methacrylate (MMA) is an important organic chemical raw material. In recent years, its downstream terminal industry has de...

Claims

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Application Information

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IPC IPC(8): C07C67/343C07C67/303C07C67/48C07C69/24C07C69/54
CPCC07C67/343C07C67/303C07C67/48C07C69/54C07C69/24
Inventor 赵国强王光永熊国焱谌晓玲王莉
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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