Method for preparing oxalate through CO catalytic coupling reaction

A technology of gas catalysis and coupling reaction, applied in the direction of carbon monoxide or formate reaction preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the difficulty of temperature control, oxalate selection Low performance and other problems, to achieve the effect of good technical effect

Active Publication Date: 2012-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is the technical problem that temperature control is difficult and the selectivity of oxalate is low in the process of preparing oxalate ester by catalytic coupling of carbon monoxide gas in the previous document technology, and a new method of catalyzing by carbon monoxide gas is provided. Coupling reaction prepares the method for oxalic acid ester

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  • Method for preparing oxalate through CO catalytic coupling reaction
  • Method for preparing oxalate through CO catalytic coupling reaction

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Experimental program
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Effect test

Embodiment 1

[0021] use figure 1The heat exchange combined reactor in the hotspot distribution area is enhanced, and the heat exchange tube is used to exchange heat for the catalyst in the heat exchange catalyst bed, wherein the distance between the upper part of the upper adiabatic catalyst bed of the reactor and the lower part of the porous gas distribution plate is the length of the reactor 1 / 20; the vertical height between the lower part of the lower adiabatic catalyst bed and the upper part of the porous gas collecting plate is 1 / 10 of the height of the reactor, the height of the upper adiabatic catalyst bed of the reactor is 1 / 8 of the height of the heat exchange catalyst bed, and the lower adiabatic The catalyst bed is 1 / 4 of the height of the heat exchange catalyst bed, and the palladium-loaded alumina catalyst with a palladium content of 0.5% is used as a catalyst, and a mixed gas with a molar ratio of CO and methyl nitrite of 1.2:1 is used as a raw material. The reaction temperat...

Embodiment 2

[0023] use figure 1 The heat exchange combined reactor in the hotspot distribution area is enhanced, and the heat exchange tube is used to exchange heat for the catalyst in the heat exchange catalyst bed, wherein the distance between the upper part of the upper adiabatic catalyst bed of the reactor and the lower part of the porous gas distribution plate is the length of the reactor 1 / 10; the vertical height between the lower part of the lower adiabatic catalyst bed and the upper part of the porous gas collecting plate is 1 / 20 of the height of the reactor, the height of the upper adiabatic catalyst bed of the reactor is 1 / 3 of the height of the heat exchange catalyst bed, and the lower adiabatic The catalyst bed is 1 / 4 of the height of the heat exchange catalyst bed, and the palladium-loaded alumina catalyst with a palladium content of 0.2% is used as the catalyst, wherein the height of the lower adiabatic catalyst layer is 1 / 10 of the height of the isothermal catalyst bed; The...

Embodiment 3

[0025] use figure 1 The heat exchange combined reactor in the hotspot distribution area is enhanced, and the heat exchange tube is used to exchange heat for the catalyst in the heat exchange catalyst bed, wherein the distance between the upper part of the upper adiabatic catalyst bed of the reactor and the lower part of the porous gas distribution plate is the length of the reactor 1 / 8; the vertical height between the lower part of the lower adiabatic catalyst bed and the upper part of the porous gas collector is 1 / 5 of the height of the reactor, the height of the upper adiabatic catalyst bed of the reactor is 1 / 3 of the height of the heat exchange catalyst bed, and the lower adiabatic The catalyst bed is 1 / 6 of the height of the heat exchange catalyst bed, and the palladium-loaded alumina catalyst with a palladium content of 0.25% is used as a catalyst, and a mixed gas with a molar ratio of CO and methyl nitrite of 1.2:1 is used as a raw material. The reaction temperature is ...

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Abstract

The invention relates to a method for preparing oxalate through CO catalytic coupling reaction. The technical problems of difficulty in temperature control and low selectivity of target product during the process of preparing oxalate through CO catalytic coupling reaction in the prior art are solved. The method comprises the following steps of: taking a mixed gas containing nitrous acid ester and CO as a raw material, and contacting the raw material with a noble metal catalyst in an upper heat-insulating catalytic bed, a heat-exchange catalytic bed and a lower heat-insulating catalytic bed in a heat-point distributed area enhanced heat-exchange combined reactor in turn, under the conditions of reaction temperature at 100-180 DEG C, volume hourly space velocity at 500-10000 per hour, reaction pressure at -0.08-1.5MPa and mole ratio of CO to nitrous acid ester being (1-5):1, thereby generating an effluent containing the oxalate by reacting. According to the technical scheme, the problem is more efficiently solved. The method is suitable for the industrial production for preparing oxalate through CO catalytic coupling.

Description

technical field [0001] The present invention relates to a method for preparing oxalate ester through catalytic coupling reaction of carbon monoxide gas, especially about the use of hot spot distribution area to strengthen the heat exchange combined reactor to realize the reaction of carbon monoxide gas phase coupling catalytic reaction to produce oxalate ester, which is applicable to the production of oxalate ester through Carbon monoxide gas catalytic coupling during the preparation of oxalate esters. Background technique [0002] Oxalate is an important organic chemical raw material, which is widely used in the fine chemical industry to produce various dyes, medicines, important solvents, extractants and various intermediates. In the 21st century, oxalate, as a degradable and environmentally friendly engineering plastic monomer, has received extensive international attention. In addition, oxalic acid can be obtained by normal pressure hydrolysis of oxalate, and oxalamide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/36C07C67/36B01J23/44B01J8/00
Inventor 刘俊涛杨卫胜孙凤侠
Owner CHINA PETROLEUM & CHEM CORP
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