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Method for synthesizing chlorodifluoroethane from dichlorodifluoroethane

A technology of difluorodichloroethane and difluoromonochloroethane, which is applied in the field of fluorine chemical industry, can solve problems such as toxicity, destruction of atmospheric ozone layer, unfavorable industrial production, etc., and achieves high selectivity and conversion rate, high conversion rate, The effect of solving pollution

Inactive Publication Date: 2019-02-12
SHANDONG HUAAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Difluorodichloroethane is not easy to separate, has low usable value, and has a strong destructive effect on the atmospheric ozone layer
But its product 1,1-difluoro-2-chloroethylene has certain toxicity, and a co-catalyst must be added in the reaction process, which is not conducive to industrial production
Chinese patent CN103965010A discloses a method for preparing R122 and R112a by liquid-phase photochlorination of HCFC-132b, and its process selectivity is greatly affected by reaction conditions

Method used

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  • Method for synthesizing chlorodifluoroethane from dichlorodifluoroethane
  • Method for synthesizing chlorodifluoroethane from dichlorodifluoroethane
  • Method for synthesizing chlorodifluoroethane from dichlorodifluoroethane

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Effect test

Embodiment 1

[0025] Add HCFC-132b with a purity of 94%, add 120ml of HCFC-132b, add 200ml of saturated calcium hydroxide anhydrous ethanol solution, use a 1L reactor with stirring, control the reaction temperature at 75°C, and the reaction pressure at 0.4-0.8Mpa Between, the reaction speed is controlled at 300-600r / min, after 3 hours of reaction, sampling analysis shows that the conversion rate of the final product HCFC-142b is 75%, and the selectivity is 98%.

[0026]

Embodiment 2

[0028] Add HCFC-132b with a purity of 94%, add 150ml of HCFC-132b, add 200ml of saturated calcium hydroxide anhydrous ethanol solution, use a 1L reactor with stirring, control the reaction temperature at 120°C, and the reaction pressure at 0.6-1.2Mpa Between, the reaction speed is controlled at 300-600r / min, after 4 hours of reaction, sampling analysis shows that the conversion rate of the final product HCFC-142b is 80%, and the selectivity is 99%.

[0029]

Embodiment 3

[0031] Add HCFC-132a with a purity of 96%, add 150ml of HCFC-132a, add 200ml of saturated sodium hydroxide anhydrous ethanol solution, use a 1L reactor with stirring, control the reaction temperature at 90°C, and the reaction pressure at 0.5-1.0Mpa Between, the reaction speed is controlled at 300 ~ 600r / min, after 4 hours of reaction, sampling analysis shows that the conversion rate of the final product HCFC-142b is 76%, and the selectivity is 96%.

[0032]

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Abstract

The invention relates to a method for synthesizing chlorodifluoroethane from dichlorodifluoroethane, and belongs to the technical field of fluorine chemical engineering. The method includes the stepsof taking any one of 1,1-dichloro-2,2-difluoroethane (HCFC-132a) and 1,2-dichloro-1,1-difluoroethane (HCFC-132b), or dichlorodifluoroethane obtained from the combination of the two, as a raw material,adding an anhydrous alcohol solution and alkali hydroxide, adding a certain quaternary ammonium salt cocatalyst, and carrying out reaction in a reaction kettle at the temperature of 50-300 DEG C for2-24 hours to generate 1,1-difluoro-1-chloroethane. The method has the advantages that a technique for re-synthesizing the chlorodifluoroethane from the high-boiling residue dichlorodifluoroethane generated in the process of chlorodifluoroethane production is provided; recycling of dichlorodifluoroethane waste generated during production is realized, and environment pollution from the dichlorodifluoroethane waste is avoided; the selectivity and the conversion rate of the product are high; the reaction is completed in one step; the process is simple; the conversion rate is high; the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a preparation method of difluoro-chloroethane, in particular to a method for synthesizing difluoro-chloroethane by recycling difluoro-dichloroethane waste resources. Background technique [0002] 1,1-difluoro-1-chloroethane (1,1-difluoro-1-chloroethane), the molecular formula is CClF 2 CH 3 , referred to as difluorochloroethane or HCFC-142b. It is a colorless gas at room temperature, with a slight aroma, easily soluble in oil, but insoluble in water; boiling point -9.2 (101.31kPa), critical temperature 136.45°C, critical pressure 4.12MPa, liquid density 1.096g / cm 3 (30°C). It is an important organic intermediate, which is used in the field of solid surface cleaning, drying, degreasing aerosol and foaming agent, and has a good market prospect. [0003] According to the different raw materials used in production, the preparation process route of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/00C07C19/12
CPCC07C17/00C07C17/10C07C19/12
Inventor 段琦王瑞英王永千李丕永傅海崔传博
Owner SHANDONG HUAAN NEW MATERIAL
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