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Method for producing highly chlorinated methanes

A technology of highly hypochlorinated methane and hypochlorinated methane, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of chlorine loss, insufficient research on raw material hindering factors, and large-scale recovery equipment.

Inactive Publication Date: 2006-12-06
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering that the above-mentioned evaporated chlorine gas needs to be liquefied and recovered again, it will lead to large-scale recovery equipment, which is unfavorable to the industry
[0008] Therefore, the chlorine gas obtained along with oxygen in the distillation is currently removed by using alkali represented by caustic soda in the detoxification equipment, and there is a problem of causing chlorine loss
[0009] In addition, the above-mentioned prior art proposes reduction targets for the blocking factors of each raw material, and the research on the blocking factors of all raw materials is not sufficient

Method used

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  • Method for producing highly chlorinated methanes

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Effect test

Embodiment 1

[0042] through as figure 1 The shown method for producing hyperchlorinated methanes using the chlorine supply method of the present invention produces hyperchlorinated methanes. Chloromethane and dichloromethane were supplied to the reactor at 9.8kg / h, chlorine containing 55 mass ppm oxygen was supplied at 9.2kg / h, and in the presence of a radical initiator, the The reaction was carried out in the liquid phase. The amount of iron brought in by this raw material was 2 mass ppm, and the moisture content was 14 mass ppm. In the reactor after the reaction started, the reaction was carried out at a stable temperature and pressure. In addition, in order to purify oxygen in chlorine to 55 mass ppm, the loss amount of chlorine was 1.5 mass %.

Embodiment 2

[0044] The same method as in Example 1 was followed except that the concentration of oxygen in the supplied chlorine was 40 mass ppm, the iron carried in from the raw material was 4 mass ppm, and the water was 18 mass ppm. In the reactor after the reaction started, the reaction was carried out at a stable temperature and pressure. In addition, in order to purify oxygen in chlorine to 40 mass ppm, the loss amount of chlorine was 2.5 mass %.

Embodiment 3

[0046] The same method as in Example 1 was followed except that the concentration of oxygen in the supplied chlorine was 20 mass ppm, the iron carried in from the raw material was 4 mass ppm, and the water content was 18 mass ppm. In the reactor after the reaction started, the reaction was carried out at a stable temperature and pressure. In addition, in order to purify the oxygen contained in chlorine to 20 mass ppm, the loss amount of chlorine was 3 mass %.

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Abstract

This invention provides a method for producing highly chlorinated methanes. The method for producing the highly chlorinated methanes by feeding a reactor with the low-chlorinated methanes and chlorine is provided. In this process, based on the total feed of the low-chlorinated methanes and chlorine to be fed to the reactor, the proportions of total metallic impurities and the total moisture in the low-chlorinated methanes and chlorine are regulated at <=5 mass ppm and <=30 mass ppm, respectively, thus markedly reducing chlorine loss in the refining step for reducing the oxygen content of the chlorine.

Description

technical field [0001] The present invention relates to a method for producing high hypochlorinated methanes using low hypochlorinated methanes and chlorine as raw materials. Specifically, it relates to a method for producing highly hypochlorinated methanes, which can extremely effectively prevent the loss of chlorine gas, which is one of the raw materials of highly hypochlorinated methanes, due to refining. technical background [0002] Among the methods for preparing high hypochlorinated methanes from low hypochlorinated methanes and chlorine, it has been disclosed that low hypochlorinated methanes react with chlorine in the liquid phase in the presence of a radical-initiating catalyst (Refer to the official gazette No. 49-24886). [0003] In the above reaction, it is a method of sequentially chlorinating low hypochlorinated methanes by using a chain reaction of chlorine radicals generated from raw material chlorine, and the problem arising in order to stabilize the react...

Claims

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Application Information

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IPC IPC(8): C07C19/03C07C17/10
Inventor 森腋正之山根淳冈田尚哉
Owner TOKUYAMA CORP
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