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Method for producing methyl methacrylate by methyl acetate and formaldehyde

A technology of methyl methacrylate and methyl acetate, which is applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve the problem of low yield of methyl methacrylate, easy deactivation of catalysts, difficult Regeneration and other issues

Inactive Publication Date: 2015-04-15
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has adopted three-way catalyst and fixed bed to react, and catalyst is easily deactivated, is difficult to regenerate, and the productive rate of the methyl methacrylate prepared by this method is low

Method used

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  • Method for producing methyl methacrylate by methyl acetate and formaldehyde
  • Method for producing methyl methacrylate by methyl acetate and formaldehyde
  • Method for producing methyl methacrylate by methyl acetate and formaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0079] The catalyst used in the fluidized bed is cesium and antimony supported by silica, wherein the cesium content is 15 wt%, and the antimony content is 10 wt%; the catalyst used in the fixed bed is platinum and ruthenium supported by aluminum oxide. The temperature of the raw material preheater is 280°C, the operating temperature of the fluidized bed reactor is 380°C, the molar ratio of methyl acetate:methyl propionate:formaldehyde:methanol is 2:1:1.5:2, and the fluidizing gas is nitrogen. Airspeed is 5h -1 , the pressure is 0.1MPa; the temperature of the catalyst regenerator is 450°C, and air is used as the regeneration gas for charcoal regeneration, and the space velocity is 20h -1 , the pressure is 0.1MPa; the residence time of the catalyst in the fluidized bed reactor is 4 hours, the amount of carbon deposit when the catalyst enters the regenerator is 6%, and the regeneration time is 1 hour; the temperature of the intermediate product preheater is 180°C, The operating...

Embodiment 2

[0082] The catalyst used in the fluidized bed is cesium and antimony supported by silica, wherein the cesium content is 15 wt%, and the antimony content is 10 wt%; the catalyst used in the fixed bed is platinum and ruthenium supported by aluminum oxide. The temperature of the raw material preheater is 280°C, the operating temperature of the fluidized bed reactor is 380°C, the molar ratio of methyl acetate: formaldehyde: methanol is 1:1:2, the fluidizing gas is nitrogen, and the space velocity is 5h -1 , the pressure is 0.1MPa; the temperature of the catalyst regenerator is 450°C, and air is used as the regeneration gas for charcoal regeneration, and the space velocity is 20h -1 , the pressure is 0.1MPa; the residence time of the catalyst in the fluidized bed reactor is 4 hours, the amount of carbon deposit when the catalyst enters the regenerator is 6%, and the regeneration time is 1 hour; the temperature of the intermediate product preheater is 180°C, The operating temperatur...

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Abstract

The invention relates to a method for producing methyl methacrylate, in particular to the method for producing the methyl methacrylate by taking methyl acetate and formaldehyde as raw materials. According to the adopted method, a fluidized bed reactor and a fixed bed reactor are used in a combined manner; unreacted methyl acetate serving as a raw material is cyclically utilized after being separated; methyl propionate generated by conducting hydrogenation on acrylic acid generated by the reaction can be sold as a byproduct, and can also be cyclically utilized with methyl acetate as a process raw material. An aldolization catalyst continuously flows between the fluidized bed reactor and a catalyst regenerator to realize a reaction regeneration process; the utilization rate of the catalyst is greatly improved; the continuity of production is realized. The fluidized bed reactor meets industrial production requirements; the high activity of the catalyst can be maintained for a long time; the use efficiency of the catalyst can be improved; the overall conversion rate is improved by the cycling of unreacted raw materials; the economic benefits are increased.

Description

technical field [0001] The invention relates to a method for producing methyl methacrylate, in particular to a method for producing methyl methacrylate from methyl acetate and formaldehyde as raw materials. Background technique [0002] Methyl methacrylate is widely 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 acetone cyanohydrin method (ACH method), but this method has the disadvantages of long process flow and highly toxic use of hydrocyanic acid. Other process routes include isobutylene method, ethylene method, improved acetone cyanohydrin method (MGC method), etc. In particular, Lucite improved the ethylene method and proposed the α process technology, which mainly includes two reaction processes: ethylene reacts with carbon monoxide and methanol to generate methyl propionate at a certain temperature and pressur...

Claims

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Application Information

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IPC IPC(8): C07C69/54C07C67/343
CPCY02P20/584C07C67/343C07C69/54
Inventor 张英伟张凌伟张新志王耀红孙长江
Owner BEIJING RISUN TECH CO LTD
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