Method for synthesizing methyl acrylate

A technology of methyl acrylate and a synthesis method, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as low yield, achieve simple preparation process, good catalytic activity and selectivity, The effect of long service life

Active Publication Date: 2014-06-11
QIQIHAR UNIVERSITY
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  • Claims
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Problems solved by technology

[0006] The present invention will solve the problem of low yield in the existing method for synthesizing methyl acrylate, and provide a kind of synthetic method of methyl acrylate

Method used

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  • Method for synthesizing methyl acrylate

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Experimental program
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Effect test

Embodiment 1

[0018] Add tetraethyl orthosilicate and ethanol into a 250ml three-neck flask at a ratio of 1.2:1 by volume, add 30ml of water, take a water bath to 50°C, and use HNO 3 Adjust pH=4, add a small amount of cetyl dimethyl ammonium bromide as a surfactant, stir for 3 hours to prepare SiO 2 Sol. Another 20gSb 2 o 3 Mix it with 2Oml of distilled water in a 50ml three-neck flask, heat to 80°C and stir to stabilize, then add 3ml of triethanolamine, stir for 15min, then heat up to 90°C, then add 3ml of H 2 o 2 (dropwise), continue to stir for 90min until the solution changes from a white suspension to a colorless transparent antimony sol.

[0019] The two sols were thoroughly mixed according to 6:1 (volume ratio), and adjusted to pH=10. The polystyrene template and the mixed solution were assembled by impregnation, ultrasonication, and suction filtration by the in-situ method, and then dried at 70°C for 1 hour, and then programmed to heat up to 600°C for 8 hours under the conditio...

Embodiment 2

[0023] Add tetraethyl orthosilicate and ethanol into a 250ml three-neck flask at a ratio of 1.2:1 by volume, add 30ml of water, take a water bath to 50°C, and use HNO 3 Adjust pH=4, add a small amount of cetyltrimethylammonium bromide as a surfactant, stir for 3 hours to prepare SiO 2 Sol. Another 25gSb 2 o 3 Mix with 20ml in a 50ml three-neck flask, heat to 80°C and stir to stabilize, then add 3ml of triethanolamine, stir for 15min, then heat up to 90°C, then add 3ml of H 2 o 2 (dropwise), continue to stir for 90min until the solution changes from a white suspension to a colorless transparent antimony sol.

[0024] The two sols were thoroughly mixed according to 7:1 (volume ratio), and adjusted to pH=10. The polystyrene template and the mixed solution were assembled by impregnation, ultrasonication, and suction filtration in situ, and then dried at 80°C for 1 hour, extracted with acetone and tetrahydrofuran, and repeated 4 times. The macroporous Sb 2 o 5 / SiO 2 Mater...

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Abstract

The invention discloses a method for synthesizing methyl acrylate. In the method, a used catalyst is a loaded three-dimensional sequential macroporous/mesoporous solid catalyst, methyl acetate and formaldehyde serve as raw materials, a normal-pressure gas-solid phase fixed bed reactor device is used, and the yield of the methyl acrylate can reach 53 to 55 percent. The method has the advantages that: a prepared catalysis material has a macroporous sequential cage structure, macropores are distributed uniformly, the average aperture is about 150nm, the macropores are connected with one another through porous windows with the diameter of between 30 and 40nm, porous walls have a certain thickness, through porous channels are realized, and mesoporou apertures, which are distributed singly, of about 5nm exist. Using effects prove that the catalyst has higher catalysis activity and selectivity and has longer service life. Test results indicate that the catalyst has an acid-base center and uniformly loaded active ingredients.

Description

technical field [0001] The present invention relates to a kind of synthetic method of methyl acrylate. Background technique [0002] Methyl acrylate is an important intermediate in organic synthesis and a monomer for synthesizing polymers. It is widely used in the fields of chemical industry, dyestuffs, and polymer synthesis. At present, the preparation methods of methyl acrylate mainly include acrylonitrile hydrolysis method, propylene oxidation method and ketene method, among which the propylene oxidation method is more widely used. [0003] In the process of synthesizing methyl acrylate by propylene oxidation, the selection of catalyst is crucial. It has been found that solid strong basic catalysts or acid-base bifunctional catalysts have a better catalytic effect on the aldol condensation reaction. [0004] Compared with mesoporous catalysts, catalysts supported by macroporous materials have more advantages such as transparent structure and large pore volume and pore s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/54C07C67/343B01J23/18
Inventor 田景芝荆涛郑永杰邓启刚
Owner QIQIHAR UNIVERSITY
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