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Preparation method of tetrachloro-1,2-difluoroethane

A technology of tetrachlorodifluoroethane and difluoro-monochloroethane is applied in the field of preparation of tetrachlorodifluoroethane, can solve the problems of low product yield, low technical conversion rate and the like, and achieves high product yield, Simple technology and less pollution from three wastes

Inactive Publication Date: 2012-11-07
SHANDONG HUAAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tetrachlorodifluoroethane (R112) is a very important fluorine chemical material. The existing production technology generally uses hexachloroethane and hydrogen fluoride as raw materials and reacts it in the presence of catalyst antimony pentachloride. However, this technology Low conversion rate and low product yield

Method used

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  • Preparation method of tetrachloro-1,2-difluoroethane
  • Preparation method of tetrachloro-1,2-difluoroethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of tetrachlorodifluoroethane of the present invention is to use the by-products produced in the process of producing difluoro-chloroethane as raw materials, and carry out photochlorination reaction with chlorine under the action of light to prepare tetrachlorodifluoroethane. Fluoroethane, the by-products mainly include difluorodichloroethane and difluorotrichloroethane and a small amount of difluoromonochloroethane;

[0025] Its reaction equation is:

[0026] C 2 h 3 f 2 Cl+3Cl 2 →C 2 f 2 Cl 4 +3HCl↑

[0027] C 2 h 2 f 2 Cl 2 +2Cl 2 →C 2 f 2 Cl 4 +2HCl↑

[0028] C 2 HF 2 Cl 3 +Cl 2 →C 2 f 2 Cl 4 +HCl↑

[0029] The described reaction temperature is 150°C.

[0030] The reaction pressure is 0.05MPa.

[0031] The described reaction time is 280 seconds.

[0032] The molar ratio of the by-product to chlorine is 1:3.

[0033] Before the experiment, the content of each substance was 8.46% of difluoromonochloroethane, 61.73% of ...

Embodiment 2

[0036] The preparation method of tetrachlorodifluoroethane of the present invention is to use the by-products produced in the process of producing difluoro-chloroethane as raw materials, and carry out photochlorination reaction with chlorine under the action of light to prepare tetrachlorodifluoroethane. Fluoroethane, the by-products mainly include difluorodichloroethane and difluorotrichloroethane and a small amount of difluoromonochloroethane;

[0037] Its reaction equation is as embodiment 1.

[0038] The described reaction temperature is 180°C.

[0039] The reaction pressure is 0.03MPa.

[0040] The reaction time is 200 seconds.

[0041] The molar ratio of the by-product to chlorine is 1:3.

[0042] Before the experiment, the content of each substance was 8.46% of difluoromonochloroethane, 61.73% of difluorodichloroethane, and 29.81% of difluorotrichloroethane.

[0043] After the experiment, the content of each substance is 1.82% of difluorochloroethane, 29.47% of difl...

Embodiment 3

[0045] The preparation method of tetrachlorodifluoroethane of the present invention is to use the by-products produced in the process of producing difluoro-chloroethane as raw materials, and carry out photochlorination reaction with chlorine under the action of light to prepare tetrachlorodifluoroethane. Fluoroethane, the by-products mainly include difluorodichloroethane and difluorotrichloroethane and a small amount of difluoromonochloroethane;

[0046] Its reaction equation is as embodiment 1.

[0047] The reaction temperature is 200°C.

[0048] The reaction pressure is 0.04MPa.

[0049] The described reaction time is 150 seconds.

[0050] The molar ratio of the by-product to chlorine is 1:3.

[0051] Before the experiment, the content of each substance was 8.46% of difluoromonochloroethane, 61.73% of difluorodichloroethane, and 29.81% of difluorotrichloroethane.

[0052] After the experiment, the content of each substance was 2.52% of difluorochloroethane, 26.36% of dif...

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Abstract

The invention belongs to the technical field of fluoride industry, in particular relates to a preparation method of tetrachloro-1,2-difluoroethane. According to the preparation method of tetrachloro-1,2-difluoroethane, raw materials, namely by-products generated during the production process of 1,1-difluoro-1-chloroethane, have a photo-chlorination reaction with chlorine under the action of light to produce tetrachloro-1,2-difluoroethane, wherein the by-products are high-boiling residues comprising 1,2 dichloro-1,1- chloroethane, 1,1-difluoro-1,2,2- trichloroethane and 1,1-difluoro-1-chloroethane. The preparation method has the advantages that the consumption of raw materials of the product is reduced, the by-products generated during the production process are effectively recycled and used, the loss of fluorine resources is effectively reduced, the energy is saved and the product quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a preparation method of tetrachlorodifluoroethane. Background technique [0002] Tetrachlorodifluoroethane (R112) is a very important fluorine chemical material. The existing production technology generally uses hexachloroethane and hydrogen fluoride as raw materials and reacts it in the presence of catalyst antimony pentachloride. However, this technology The conversion rate is low and the product yield is low. [0003] In recent years, with the continuous expansion and development of the production scale of difluorochloroethane, high boiling substances (including difluorodichloroethane, difluorotrichloroethane and a small amount of difluorochloroethane) produced in the production process alkane) more and more. If this part of the material is used as a solvent, not only the cost is high, but also the solvent will pollute the environment after vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/12C07C17/10C01B7/01
Inventor 段琦王瑞英李明王辉晓刘万路
Owner SHANDONG HUAAN NEW MATERIAL