Method for producing glyoxylate

A technology of glyoxylate and its production method, which is applied to the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, and can solve the problems of low yield of methyl glyoxylate

Inactive Publication Date: 2019-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the published patents and documents mainly focus on the catalyst and process research and development of the catalytic oxidation of methyl glycolate to produce methyl glyoxylate, and there are few reports on the type of reactor used, and the yield of methyl glyoxylate is low. The obvious defects still need to be further improved and developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The methyl glycolate catalytic oxidation reactor is a tubular fixed-bed reactor, the catalyst is installed inside the tubular, and the cooling medium is outside the tubular. The oxygen-containing gas is air. The molar ratio of oxygen and methyl glycolate entering the reactor is 3:1, and the weight space velocity of methyl glycolate is 2.0h -1 , the reaction temperature is 350°C, and the pressure is 1.0MPa.

[0022] The column tube contains three stages of catalyst beds, and the ratio of the content of catalyst active components in the third stage, the second stage and the first stage of the catalyst bed is 4:2.5:1.

[0023] The catalyst in the first stage of the catalyst bed layer takes alumina as the carrier, vanadium as the active component, and molybdenum as the auxiliary agent. The parts by weight of vanadium are 2 parts, the parts by weight of molybdenum are 10 parts, and the parts by weight of the carrier The number is 88 copies.

[0024] The catalyzer in the s...

Embodiment 2

[0028] The methyl glycolate catalytic oxidation reactor is a tubular fixed-bed reactor, the catalyst is installed inside the tubular, and the cooling medium is outside the tubular. The oxygen-containing gas is air. The molar ratio of oxygen and methyl glycolate entering the reactor is 2:1, and the weight space velocity of methyl glycolate is 0.8h -1 , the reaction temperature is 260°C, and the pressure is 0.6MPa.

[0029]The column tube contains three stages of catalyst beds, and the ratio of the catalyst active component content in the third stage, the second stage and the first stage catalyst bed is 2.7:1.8:1.

[0030] The catalyst in the first stage of the catalyst bed layer takes alumina as a carrier, vanadium as an active component, and molybdenum as an auxiliary agent. The parts by weight of vanadium are 3 parts, the parts by weight of molybdenum are 10 parts, and the parts by weight of the carrier The number is 87 copies.

[0031] The catalyzer in the second stage ca...

Embodiment 3

[0035] The methyl glycolate catalytic oxidation reactor is a tubular fixed-bed reactor, the catalyst is installed inside the tubular, and the cooling medium is outside the tubular. The oxygen-containing gas is a mixture of oxygen and nitrogen, and in parts by volume, the oxygen content is 1 part, and the nitrogen content is 99 parts. The molar ratio of oxygen and methyl glycolate entering the reactor is 2:1, and the weight space velocity of methyl glycolate is 1.5h -1 , the reaction temperature is 300°C, and the pressure is 0.8MPa.

[0036] The column tube contains three stages of catalyst beds, and the ratio of the content of catalyst active components in the third stage, the second stage and the first stage of the catalyst bed is 2.2:1.2:1.

[0037] The catalyzer in the first stage catalyst bed is carrier with silicon oxide, with vanadium as active component, with copper as additive, the parts by weight of vanadium is 3.5 parts by weight, the parts by weight of copper is 4 ...

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Abstract

The invention relates to a method for producing glyoxylate. The method comprises the step of enabling oxygen-containing gas to pass through a reactor with a catalyst under the condition of oxidative dehydrogenation. The reactor comprises n sections of catalyst bed layers; the contents of catalyst active components in the n catalyst bed layers from an inlet to an outlet of the reactor are graduallyincreased; and n is an integer between 2 and 10. The method can be used for industrial production of the glyoxylate.

Description

technical field [0001] The invention relates to a method for producing 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, and plastic additives. It can be used to produce oral penicillin, vanillin, mandelic acid and allantoin, etc. Consumption has also been on the rise. [0003] The preparation methods of glyoxylic acid at home and abroad mainly include: glyoxal oxidation method, oxalic acid electrolytic reduction method, dichloroacetic acid or dibromoacetic acid hydrolysis method, maleic anhydride ozone oxidation method, glycolic acid enzyme catalytic oxidation method, In addition, there are ethylene oxidation and acetaldehyde oxidation. Among them, the glyoxal oxidation method is currently the main production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/716C07C67/313B01J8/02B01J8/06B01J8/04
CPCB01J8/02B01J8/0453B01J8/06C07C67/313C07C69/716
Inventor 孙凤侠刘俊涛龚海燕宋海峰
Owner CHINA PETROLEUM & CHEM CORP
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