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Synthesis method for methyl acrylate from methyl acetate and formaldehyde

A technology of methyl acrylate and methyl acetate, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of fast catalyst deactivation, short life, and cannot solve the problem of rapid deactivation of catalyst, etc. Achieve the effect of achieving continuity, solving short lifespan and improving use efficiency

Inactive Publication Date: 2013-12-11
旭阳化学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the aldol condensation, whether it uses a basic catalyst or an acidic catalyst, there are problems of rapid catalyst deactivation, short life, and repeated regeneration.
Therefore, neither the staged catalyst nor the fixed bed can solve the problem of rapid catalyst deactivation.

Method used

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  • Synthesis method for methyl acrylate from methyl acetate and formaldehyde
  • Synthesis method for methyl acrylate from methyl acetate and formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The catalyst is Cs-Zr salt or its oxide supported on silica, the content of Cs is 10%, the content of Zr is 1%, and the particle size of the silica carrier is 150-250 microns. The temperature of the mixing preheater is 300°C, the reaction temperature is 330°C, the molar ratio of methyl acetate: formaldehyde: methanol is 1:1:1.5, the fluidizing gas is nitrogen, and its space velocity is 5h -1 , the pressure is 0.05MPa; the temperature of the catalyst regenerator is 420°C, and nitrogen with an oxygen content of 1% is used as the regeneration gas for charcoal regeneration, and the space velocity is 30h -1 , the pressure is 0.1MPa; the residence time of the catalyst in the fluidized bed reactor is 4 hours, the carbon content of the catalyst when it enters the regenerator is 4wt%, the regeneration time is 4 hours, and the carbon content after regeneration is 0.1%; The molar conversion of methyl ester was 14.5%, and the molar selectivity of methyl acrylate was 9...

Embodiment 2

[0034] Embodiment two: the catalyst is Cs-Zr-Mg salt or its oxide supported by silica, the Cs content is 13%, the Zr content is 0.5%, the Mg content is 0.5%, and the particle diameter of the silica carrier is 150- 250 microns. The temperature of the mixing preheater is 330°C, the reaction temperature is 340°C, the molar ratio of methyl acetate: formaldehyde: methanol is 1:1:1.5, the fluidizing gas is nitrogen, and its space velocity is 10h -1 , the pressure is 0.05MPa; the temperature of the catalyst regenerator is 450°C, and nitrogen with an oxygen content of 1% is used as the regeneration gas for charcoal regeneration, and the space velocity is 30h -1 , the pressure is 0.1MPa; the residence time of the catalyst in the fluidized bed reactor is 10 hours, the carbon content of the catalyst when it enters the regenerator is 5wt%, the regeneration time is 4 hours, and the carbon content after regeneration is 0.1%; The molar conversion of methyl ester was 18%, and the molar selec...

Embodiment 3

[0035] Embodiment 3: The catalyst is Cs-Zr salt or its oxide supported by silica, the Cs content is 15%, the Zr content is 0.5%, and the particle size of the silica carrier is 75-150 microns. The temperature of the mixing preheater is 260°C, the reaction temperature is 360°C, the molar ratio of methyl acetate: formaldehyde: methanol is 0.5:1:1.5, the fluidizing gas is nitrogen, and its space velocity is 6h -1 , the pressure is 0.05MPa; the temperature of the catalyst regenerator is 450°C, and nitrogen with an oxygen content of 1% is used as the regeneration gas for charcoal regeneration, and the space velocity is 30h -1 , the pressure is 0.1MPa; the residence time of the catalyst in the fluidized bed reactor is 8 hours, the carbon content of the catalyst when it enters the regenerator is 4.8wt%, the regeneration time is 4 hours, and the carbon content after regeneration is 0.1%; The molar conversion of methyl acetate is 28%, and the molar selectivity of methyl acrylate is 93%....

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Abstract

The invention relates to a synthesis method for methyl acrylate from methyl acetate and formaldehyde. According to the method, a catalyst is regenerated in a catalyst regenerator, the problem of rapid inactivation of the catalyst is overcome through coupling of a fluidized bed reactor and the catalyst regenerator, and continuous production is realized.

Description

technical field [0001] The present invention relates to a kind of method that is prepared methyl acrylate by methyl acetate and formaldehyde, specifically, the present invention relates to adopting the method for the continuous stable synthetic methyl acrylate of fluidized bed process. Background technique [0002] Methyl acrylate, also known as methyl patinate, is an intermediate in organic synthesis and a monomer in the synthesis of high molecular polymers. It is widely used in rubber, medicine, leather, papermaking, adhesives, etc. Its demand is also increasing year by year. The synthesis methods of acrylic acid (ester) mainly include: acrylonitrile hydrolysis method, propylene oxidation method and ketene method, among which the propylene oxidation method is more widely used. In industrial production, the method of oxidizing propylene to acrylic acid and then esterifying to the corresponding ester accounts for about 95%. [0003] Due to the serious surplus of raw materi...

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 杨雪岗王耀红王朋张凌伟孙长江庞伟伟
Owner 旭阳化学技术研究院有限公司
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