Production method for glyoxalate

A technology of glyoxylate and production method, applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low yield of glyoxylate and the like

Active Publication Date: 2017-12-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the prior art has the problem of low glyoxylate yield, and a new method for producing glyoxylate is provided

Method used

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  • Production method for glyoxalate

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Experimental program
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Effect test

Embodiment 1

[0030] Get 60g the catalyst that contains 3 parts of V, 7 parts of Sn and 90 parts of alumina carriers and load as figure 1 inside the reactor shown. The methyl glycolate diluted with water enters from inlet 2, the carrier gas nitrogen enters from inlet 3 and mixes with the methyl glycolate aqueous solution and enters the reactor together, and the air enters from inlet 1, passing through a height of 60% of the catalyst bed height, membrane The α-alumina ceramic membrane oxygen distributor with a pore size of 0.48 μm reacts with methyl glycolate on the catalyst. Control the reaction temperature to 250°C, the reaction pressure to 0.1MPa, and the space velocity to 0.5h -1 , the molar ratio of diluent to methyl glycolate is 1:1, the molar ratio of oxygen to methyl glycolate is 0.7:1, and the molar ratio of nitrogen to methyl glycolate is 50:1. After the reaction, the product was analyzed by gas-liquid separation and sampling. The conversion rate of methyl glycolate was 98.1%, an...

Embodiment 2

[0032] Get 60g the catalyst that contains 3 parts of V, 7 parts of Sn and 90 parts of alumina carriers and load as figure 1 inside the reactor shown. The methyl glycolate diluted with water enters from inlet 2, the carrier gas nitrogen enters from inlet 3 and mixes with the methyl glycolate aqueous solution and enters the reactor together, and the air enters from inlet 1, passing through a height of 60% of the catalyst bed height, membrane A silicon oxide ceramic membrane oxygen distributor with a pore size of 0.13 μm reacts with methyl glycolate on the catalyst. Control the reaction temperature to 250°C, the reaction pressure to 0.1MPa, and the space velocity to 0.5h -1 , the molar ratio of diluent to methyl glycolate is 1:1, the molar ratio of oxygen to methyl glycolate is 0.7:1, and the molar ratio of nitrogen to methyl glycolate is 50:1. After the reaction, the product was analyzed by gas-liquid separation and sampling. The conversion rate of methyl glycolate was 98.2%, ...

Embodiment 3

[0034] Get 60g the catalyst that contains 3 parts of V, 7 parts of Sn and 90 parts of alumina carriers and load as figure 1 inside the reactor shown. The methyl glycolate diluted with water enters from inlet 2, the carrier gas nitrogen enters from inlet 3 and mixes with the methyl glycolate aqueous solution and enters the reactor together, and the air enters from inlet 1, passing through a height of 60% of the catalyst bed height, membrane A titanium oxide ceramic membrane oxygen distributor with a pore size of 0.24 μm reacts with methyl glycolate on the catalyst. Control the reaction temperature to 250°C, the reaction pressure to 0.1MPa, and the space velocity to 0.5h -1 , the molar ratio of diluent to methyl glycolate is 1:1, the molar ratio of oxygen to methyl glycolate is 0.7:1, and the molar ratio of nitrogen to methyl glycolate is 50:1. After the reaction, the product was analyzed by gas-liquid separation and sampling. The conversion rate of methyl glycolate was 98.6%,...

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Abstract

The invention relates to a production method for glyoxylate. The invention mainly aims to overcome the problem of low yield of glyoxylate in the prior art. The method comprises a step of contacting oxygen-containing gas, glycollate, a diluent and carrying gas with a catalyst in a reactor under gas-phase oxidation conditions. With the technical scheme that the oxygen-containing gas is allowed to pass through a ceramic membrane distributor and then enter a reactor, the above problem is overcome, and the production method is applicable to industrial production of glyoxalate from glycollate through oxidation.

Description

technical field [0001] The invention relates to a production method of glyoxylate. Background technique [0002] Glyoxylate has both the chemical properties of aldehyde and ester, and can undergo various reactions, especially glyoxylic acid can be prepared by hydrolysis. Glyoxylic acid is an organic intermediate for the synthesis of spices, medicine, food, varnish raw materials, dyes, plastic additives, etc. It can be used to produce oral penicillin, vanillin, mandelic acid and allantoin, etc. Consumption has also been on the rise. [0003] The production methods of glyoxylic acid are different according to the starting materials, and there are about a dozen kinds at present. The most commonly used in industry are oxalic acid electrolytic reduction method, glyoxal nitric acid oxidation method, maleic acid (anhydride) ozonation method, etc. At present, the domestic glyoxylic acid industry has encountered two major problems: first, the supply of large quantities of high-qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/313C07C69/67B01J23/22B01J29/068
CPCB01J23/22B01J29/068B01J2229/183C07C67/313C07C69/67
Inventor 龚海燕刘国强宋海峰
Owner CHINA PETROLEUM & CHEM CORP
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