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Method for refining methane chloride crude product

A methane chloride and crude product technology, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., to achieve the effect of simple operation, no reduction in product quality, and reduced alkali consumption

Inactive Publication Date: 2011-02-09
NINGBO JUHUA CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional process, this process mainly does not need to use water washing and alkali washing to remove the acid from the reaction unit and collect crude chloride. Instead, it adopts the condensation method to collect crude chloride, and removes the water washing and alkali washing of the chlorination reaction unit. Alkali washing process, not involving the acid removal process in the rectification stage of the product

Method used

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  • Method for refining methane chloride crude product
  • Method for refining methane chloride crude product

Examples

Experimental program
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specific Embodiment approach

[0013] As shown in the figure, chlorine gas, chlorination catalyst and monochloromethane enter the chlorination reactor 1 react. Chlorination Reactor 1 The crude product mixture that comes out passes through the hydrogen chloride / monochloromethane recovery tower 2 , the hydrogen chloride / chloromethane from the hydrogen chloride / chloromethane recovery tower 2 Recycling at the top of the tower. Hydrogen chloride / chloromethane column 2 The crude product at the bottom of the tower is discharged into the crude product tank 3 , the crude product directly enters the dichloromethane tower without alkali washing and water washing 4 , It can be rectified at normal pressure or under pressure, the temperature is controlled at 40-130°C, and the pressure is controlled at 0-0.25MPaG. Dichloromethane tower 4 A small amount of acid-containing dichloromethane at the top of the tower can be recycled back to the chlorination reactor 1 , can also be returned to the hydrogen chloride / chloro...

Embodiment

[0016] The crude product is directly rectified without alkali washing, the temperature is controlled at 40-130°C, and the pressure is controlled at 0-0.25MPaG. 4 , 6 The extracted dichloromethane and chloroform products pass through the solid alkali processor 7 , The product quality is not reduced, the waste water is reduced, and the energy consumption is saved.

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Abstract

The invention discloses a novel process for refining a methane chloride crude product. The process comprises the step of directly rectifying the methane chloride crude product without alkali cleaning or dehydrating, wherein, in a rectifying process, acid accumulated by a system is returned to a chlorination system by circulating a small quantity of dichloromethane and chloroform, the rectified product passes through a solid caustic soda treater to ensure the product quality and realize excellent energy-saving consumption-reducing effect. The process is particularly suitable for a device for producing the methane chloride requiring high chloroform proportion, and realizes economic, energy-saving and eco-friendly operation.

Description

technical field [0001] The invention relates to a method for preparing methane chloride, in particular to a method for refining a crude product of methane chloride. Background technique [0002] The traditional crude product of methane chloride is firstly washed with alkali to remove acid, then dehydrated, and finally qualified dichloromethane, chloroform and carbon tetrachloride products are refined or the crude product is first rectified to obtain qualified pure dichloromethane and chloroform And carbon tetrachloride product, dichloromethane, chloroform and carbon tetrachloride product are obtained qualified product through alkaline cleaning acid removal and dehydration respectively again. The waste water produced by alkali washing is removed by the stripper to remove methane chloride, and then the waste water is neutralized. The operating cost of the alkali washing and dehydration system in this process is high, the equipment is severely corroded, and it is difficult to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/03C07C17/383C07C19/04
Inventor 郭志毅陈鸿福雷俊杨理想刘水长
Owner NINGBO JUHUA CHEM TECH CO LTD
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