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Preparation method of difluoro chloroethane and its production equipment

A technology for difluoromonochloroethane and production equipment, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of low conversion rate, low conversion rate and selectivity, low conversion rate and the like, Achieve the effect of satisfying mass production, convenient luminous flux control, and low unit consumption

Active Publication Date: 2004-12-22
ZHEJIANG AIKESHENG CHEM
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Since the mixed material is added from the bottom, the material only moves from top to bottom in the reactor, there is no or little horizontal movement between the materials, and the uniformity between the materials is poor. Once the chlorine gas is excessive in a local area, it will produce high Chlorine compounds, in order to reduce the production of high-chlorine compounds, the method of obtaining a higher yield with a low conversion rate is often used in operation, so the conversion rate is low and the luminous flux of the tubular or tower reactor is difficult to control
[0003] Therefore, in the above-mentioned background technology, the external photochemical reaction method is affected by light-transmitting materials and is not suitable for large-scale production; while the tube or tower internal photochemical reaction method has defects such as low conversion rate and selectivity, and difficult control of luminous flux.

Method used

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  • Preparation method of difluoro chloroethane and its production equipment
  • Preparation method of difluoro chloroethane and its production equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, the tank-type multi-stage reactor adopts a three-stage reactor. Its technological process is:

[0032] A. Mix difluoroethane and chlorine gas at a weight ratio of 85:75Kg and then add them to the primary photochemical reactor. The temperature of the reactor is controlled at 55°C, and the reaction residence time is 40 seconds; adjust the luminous flux to make the sample appear on the chromatogram A high boiler peak with a peak height of 0-2 mm appears;

[0033] B. Import the materials of the above-mentioned primary reactor into the secondary reactor through the connecting pipe, add 10Kg of chlorine gas, control the temperature of the reactor at 55°C, and the reaction residence time is 40 seconds; adjust the luminous flux so that the sample appears on the chromatogram 2-4mm high boiler peak;

[0034] C. Import the materials of the above-mentioned secondary reactor into the tertiary reactor through the connecting pipe, add 5Kg of chlorine gas, control...

Embodiment 2

[0043] In this embodiment, the kettle-type multi-stage reactor adopts a two-stage reactor. Its technological process is:

[0044] A. Mix difluoroethane and chlorine gas in a weight ratio of 65:60Kg and add them to the primary photochemical reactor. The temperature of the reactor is controlled at 50°C, and the reaction residence time is 50 seconds; adjust the luminous flux to make the sample appear in the chromatogram. A high boiler peak with a peak height of 0-2 mm appears on the top;

[0045] B. Import the material of the above-mentioned primary reactor into the secondary reactor through the connecting pipe, add 10Kg of chlorine gas, control the temperature of the reactor at 50°C, and the reaction residence time is 50 seconds; adjust the luminous flux to make the chromatogram of the sample appear 4mm peak;

[0046] C. Separation treatment:

[0047] a Removal of HCL: The material in the three-stage reactor is absorbed by the graphite absorption tower, and the water spray vol...

Embodiment 3

[0054] In this embodiment, the tank-type multi-stage reactor adopts a three-stage reactor. Its technological process is:

[0055] A. Mix difluoroethane and chlorine gas at a weight ratio of 60:50Kg and then add them to the primary photochemical reactor. The temperature of the reactor is controlled at 45°C, and the reaction residence time is 60 seconds; adjust the luminous flux to make the sample appear in the chromatogram. A high boiler peak with a peak height of 0-2 mm appears on the top;

[0056] B. Import the materials of the above-mentioned primary reactor into the secondary reactor through the connecting pipe, add 10Kg of chlorine gas, control the temperature of the reactor at 45°C, and the reaction residence time is 60 seconds; adjust the luminous flux so that the sample appears on the chromatogram 2-4mm high boiler peak;

[0057] C. Import the materials of the above-mentioned secondary reactor into the tertiary reactor through the connecting pipe, add 4Kg of chlorine ...

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Abstract

A process for preparing difluorochloro ethane from difluoroethane and chlorine gas includes proportionally mixing, three-class photo-chemical reaction while regulating light flux for presenting the high-boiling-point substance peaks with different heights, removing acid, alkali washing, compressing, degassing, rectifying and drying. Its equipment is disclosed also. Its advantages are high conversion rate of difluoroethane and high selectivity and purity of product.

Description

technical field [0001] The invention relates to a method for preparing difluoro-chloroethane and its production equipment, in particular to a method for producing difluoro-chloroethane by photochlorination reaction of difluoroethane and chlorine under the action of ultraviolet light Methods. Background technique [0002] Conventionally utilize difluoroethane under the action of ultraviolet light and chlorine generation photochlorination to produce the method for difluoro-chloroethane to have: 1, the external photochemical reaction method that light source shines into the reactor from the outside of the reactor, like this The reactor is required to have good light transmission and is usually made of glass and quartz glass. Therefore, the reaction equipment is less and is easily damaged during use. At the same time, during the reaction, chlorine gas and some products make the reactor wall form a colored layer. film, which affects the amount of light; 2. There is a light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/10C07C17/35C07C19/10
Inventor 胡成显
Owner ZHEJIANG AIKESHENG CHEM
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