Method for preparing methyl methacrylate from methyl propionate and formaldehyde

A technology of methyl methacrylate and methyl propionate, which is applied in the field of preparation of methyl methacrylate, can solve the problems of increasing the difficulty and requirements of separation and refining operations, large fluctuations in product concentration, and catalyst deactivation, so as to achieve continuity , Improve the conversion rate, improve the effect of utilization efficiency

Active Publication Date: 2012-11-14
BEIJING RISUN TECH CO LTD
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  • Abstract
  • Description
  • Claims
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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.

Method used

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  • Method for preparing methyl methacrylate from methyl propionate and formaldehyde

Examples

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Embodiment 1

[0038] The catalyst is cesium and magnesium supported on silica, wherein the content of cesium is 10wt%, and the content of magnesium is 1wt%. The silica used is produced by Nanjing Heyi Company, 30-100 mesh microspheres. Pure nitrates. Firstly, cesium and magnesium nitrates are dissolved in water to form a solution, loaded on silica by impregnation method, dried at 120°C for 12 hours, and calcined at 350°C for 6 hours to obtain a catalyst.

[0039] The temperature of the preheater 3 is 320°C, the temperature of the fluidized bed reactor 4 is 320°C, the molar ratio of methyl propionate: formaldehyde: methanol is 1:1:1.5, the fluidizing gas is nitrogen, and its space velocity is 5h -1 , the pressure is 0.1MPa; the temperature of the catalyst regenerator 5 is 400°C, and the air is used as the regeneration gas for charcoal regeneration, and its 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 carbo...

Embodiment 2

[0041] The catalyst is cesium and zirconium supported on silica, wherein the content of cesium is 10wt%, and the content of zirconium is 2wt%. The silica used is produced by Nanjing Heyi Company, with 30-100 mesh microspheres. Pure nitrates. The catalyst preparation steps were the same as in Example 1 except that cesium and zirconium nitrates were dissolved in water to form a solution.

[0042] The temperature of the preheater 3 is 320°C, the temperature of the fluidized bed reactor 4 is 280°C, the molar ratio of methyl propionate: formaldehyde: methanol is 2:1:1.5, the fluidizing gas is nitrogen, and its space velocity is 5h -1 , the pressure is 0.14MPa; the temperature of the catalyst regenerator 5 is 450°C, and air is used as the regeneration gas for charcoal regeneration, and its space velocity is 100h -1 , the pressure is 0.15MPa; the residence time of the catalyst in the fluidized bed reactor is 6 hours, the carbon deposition amount when the catalyst enters the regenera...

Embodiment 3

[0044] The catalyst is a microsphere catalyst with a cesium content of 10wt%, a magnesium content of 2wt%, a zirconium content of 1wt%, and the rest being silica. Salt, silica was obtained from commercially available aqueous silica sol solutions. The nitrates of cesium, magnesium and zirconium are dissolved in water to form a solution, which is uniformly mixed with the commercially available silica sol aqueous solution, and then the catalyst is prepared by a spray granulation method.

[0045] The temperature of the preheater 3 is 250°C, the temperature of the fluidized bed reactor 4 is 250°C, the molar ratio of methyl propionate: formaldehyde is 3:1, the fluidizing gas is nitrogen, and its space velocity is 100h -1 , the pressure is 0.2MPa; the temperature of the catalyst regenerator 5 is 600°C, and air is used as the regeneration gas for charcoal regeneration, and its space velocity is 500h -1 , the pressure is 0.21MPa; the residence time of the catalyst in the fluidized bed...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/343
CPCY02P20/584
Inventor 张英伟吉定豪张新志王朋孙长江刘小晨
Owner BEIJING RISUN TECH CO LTD
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