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Preparing method of carbon monoxide, and preparing method of carbonyl chloride by using carbon monoxide

A technology of carbon monoxide and a manufacturing method, applied in directions such as carbon monoxide and phosgene, can solve the problems of inability to remove, poor production efficiency, shortened life of solid catalyst, etc., to avoid the reduction of production volume, suppress the increase of pressure drop, and have excellent industrial effects Effect

Inactive Publication Date: 2010-12-29
TEIJIN KASEK KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in all methods, the nickel (Ni) compound in the carbon monoxide cannot be removed to a concentration that can suppress the rise in pressure drop, and when using this carbon monoxide to manufacture carbonyl chloride, it will promote the accumulation of solid compounds containing nickel on the solid catalyst. Increased pressure drop due to the surface layer and gaps and deterioration of the solid catalyst, further shortening the life of the solid catalyst, causing problems that are not conducive to cost and poor production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The coke used was coke obtained by pulverizing commercially available coke with a nickel content of 500 ppm by weight and an average particle diameter of 50 mm so that the average particle diameter becomes smaller than 25 mm, and then soaking the coke in 1 mol / L hydrochloric acid. Coke obtained by washing with water after 24 hours in the aqueous solution. The pH of the washed water was 6. The coke was dried at 120° C. for 24 hours in a rotary kiln. At this time, the water content of the coke was 0.3% by weight, and the nickel content was 100 ppm by weight.

[0032] Carbon monoxide is produced by blowing a mixed gas of oxygen and carbon dioxide into a carbon monoxide production furnace filled with the coke. The obtained CO (nickel compound content: 10 volume ppm) was brought into contact with activated alumina added with metal oxides such as chromium (Cr), and after convective contact with caustic soda aqueous solution, cooled to 5°C using a heat exchanger, and then al...

Embodiment 2

[0035] CO was produced in the same manner as in Example 1, except that coke with a Ni content of 100 wtppm used in Example 1 and a commercially available coke with a Ni content of 500 wtppm were mixed at a ratio of 2:1. The purity of the obtained CO was 98.5% by volume, the dew point of CO was below -45°C, the concentration of nickel compounds in CO was 0.02 ppm by volume, and the concentration of sulfur compounds in CO was below 0.2 ppm by volume. 100 t of phosgene was produced using this CO, and as a result, the gas pressure drop from the mixer inlet to the phosgene reaction tank outlet increased by 0.05 kPa compared to when the phosgene production started.

Embodiment 3

[0037] CO was produced in the same manner as in Example 1, except that coke with a Ni content of 100 wtppm used in Example 1 and a commercially available coke with a Ni content of 500 wtppm were mixed at a ratio of 1:1. The purity of the obtained CO was 98.5% by volume, the dew point of CO was -45°C or lower, the nickel compound concentration in CO was 0.04 volume ppm, and the sulfur compound concentration in CO was 0.2 volume ppm or less. 100 t of phosgene was produced using this CO, and as a result, the gas pressure drop from the inlet of the mixer to the outlet of the phosgene reaction tank increased by 0.3 kPa compared to when the production of phosgene was started.

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Abstract

The invention provides a method for preparing carbonyl chloride and a method for preparing carbon monoxide by using carbonyl chloride as a raw material. According to the method for preparing carbonyl chloride, pressure drop enlargement and solid catalyst degradation caused by that solid compound containing nickel is accumulated at the surface and gaps of the solid catalyst are inhibited, updating frequency of the solid catalyst is reduced, which is beneficial to cost, and the production efficiency is good. The method for preparing carbon monoxide comprises a step of feeding oxygen containing gas to coke, characterized in that coke with nickel content of 350 weight ppm is used.

Description

technical field [0001] The present invention relates to a method for producing carbon monoxide and a method for producing phosgene using the same. More specifically, it relates to a method for producing carbon monoxide having a low nickel compound content, and a method for producing phosgene using the obtained carbon monoxide. In addition, it is also involved in the use of carbon monoxide (CO) and chlorine (Cl 2 ) is reacted on a solid catalyst to produce carbonyl chloride, and the increase in pressure drop of the solid catalyst layer and the deterioration of the solid catalyst caused by the accumulation of solid compounds containing nickel on the surface and gaps of the solid catalyst are suppressed, which is advantageous in terms of cost and excellent in production efficiency. The manufacture method of carbonyl chloride. Background technique [0002] As a method for industrially producing carbon monoxide, a method for oxidizing coke is generally known. Such carbon monox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/18B01J23/755C01B31/28C01B32/40C01B32/80
Inventor 水野琢也仓垣雅弘
Owner TEIJIN KASEK KK