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Oxidative synthesis method of glyoxylate

A technology for glyoxylate and oxidation synthesis, which is applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., and can solve problems such as high reaction temperature and low yield of glyoxylate

Active Publication Date: 2020-08-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the prior art has the problems of high reaction temperature and low yield of glyoxylate, and a new oxidation synthesis method of glyoxylate is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 6g of a β-type molecular sieve catalyst with a silicon-aluminum ratio of 5 in a fixed-bed reactor, using NO, air and methyl glycolate as raw materials, wherein the molar ratio of NO to the oxygen contained in the air is 6, and the oxygen and ethanol in the air The molar ratio of methyl glycolate is 0.8, the reaction temperature is 80°C, the reaction pressure is 0.2MPa, and the mass space velocity of methyl glycolate is 1h -1 Under the condition of contact with the catalyst, the product is condensed after the reaction, the gas and liquid are separated, and the liquid phase is sampled and analyzed. The reaction results are shown in Table 1.

Embodiment 2

[0022] According to the reaction conditions of [Example 1], only the catalyst is changed to a β-type molecular sieve catalyst containing 0.0005% P with a silicon-aluminum ratio of 5. That is, weigh 6g of a β-type molecular sieve catalyst containing 0.0005% P with a silicon-aluminum ratio of 5 and place it in a fixed-bed reactor, using NO, air and methyl glycolate as raw materials, wherein the molar ratio of NO to oxygen contained in the air is 6 , the molar ratio of oxygen and methyl glycolate in the air is 0.8, at a reaction temperature of 80°C, a reaction pressure of 0.2MPa, and a mass space velocity of methyl glycolate of 1h -1 Under the condition of contact with the catalyst, the product is condensed after the reaction, the gas and liquid are separated, and the liquid phase is sampled and analyzed. The reaction results are shown in Table 1.

Embodiment 3

[0024] According to the reaction conditions of [Example 1], only the catalyst is changed to a β-type molecular sieve catalyst containing 0.05% P with a silicon-aluminum ratio of 5. That is, weigh 6g of a β-type molecular sieve catalyst containing 0.01% P with a silicon-aluminum ratio of 5 and place it in a fixed-bed reactor, using NO, air and methyl glycolate as raw materials, wherein the molar ratio of NO to oxygen contained in the air is 6 , the molar ratio of oxygen and methyl glycolate in the air is 0.8, at a reaction temperature of 80°C, a reaction pressure of 0.2MPa, and a mass space velocity of methyl glycolate of 1h -1 Under the condition of contact with the catalyst, the product is condensed after the reaction, the gas and liquid are separated, and the liquid phase is sampled and analyzed. The reaction results are shown in Table 1.

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PUM

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Abstract

The invention relates to an oxidation synthesis method for glyoxalate. The invention mainly aims to overcome the problems of high reaction temperature and low yield of glyoxylate in the prior art. The method comprises a reaction step of contacting a fluid containing a nitrogen oxide, an oxygen-containing fluid and a glycollate-containing fluid in the presence of a catalyst to produce glyoxylate. The catalyst is at least one molecular sieve selected from a group consisting of a ZSM-5 molecular sieve, a beta-type molecular sieve and a Y-type molecular sieve. With such a technical scheme, the above problem is overcome, and the method is applicable to industrial production of glyoxylate through oxidation of glycollate.

Description

technical field [0001] The invention relates to an oxidation synthesis 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 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/67C07C67/313C07C69/716
CPCC07C67/313C07C69/716
Inventor 龚海燕张旭李蕾
Owner CHINA PETROLEUM & CHEM CORP
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