Method for producing trichlorotrifluoroethane by high-temperature gas phase chlorination method

A technology of trifluorotrichloroethane and trifluoroethane, which is applied in the field of high-temperature gas phase chlorination to produce trifluorotrichloroethane, can solve the problems of high raw material prices, low reaction conversion rate, and many reaction steps, and achieve The effect of low raw material cost, high yield and few steps

Active Publication Date: 2012-08-01
AZUREWAVE TEHNOLOGIES INC
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] 1. The price of raw materials is high, trichlorethylene is 40,000 yuan / ton,
[0004] 2. There are many reaction steps, and the heat sources are different in two steps.
[0005] 3. The reaction conversion rate is low

Method used

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Embodiment Construction

[0026] Below in conjunction with embodiment, the present invention is further described.

[0027] The production of trifluorotrichloroethane by high-temperature gas-phase chlorination method comprises the following steps:

[0028] A. Chlorination system

[0029] Vacuumize the system, replace it with nitrogen, heat the 1st and 2nd reactors with electricity, heat the 3rd reactor with thermal oil, and check the opening of each valve. When the temperature of the first-stage reactor reaches 420-580°C, the temperature of the second-stage reactor reaches 420-600°C, and the temperature of the third-stage reactor reaches 200-280°C, first add trifluoroethane to the first-stage reactor Gas and recovery gas, then add chlorine gas, the reaction is normal, add chlorine gas to the outlet of the second-stage reactor, and add chlorine gas to the third-stage reactor.

[0030] The molar ratio of trifluoroethane and chlorine is 1:0.5~0.7, and the chlorine reacts with a little excess. When the ...

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Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a method for producing trichlorotrifluoroethane by a high-temperature gas phase chlorination method. According to the method for producing trichlorotrifluoroethane by the high-temperature gas phase chlorination method, a one-step segmented different-temperature serially-connected high-temperature gas phase is adopted for synthesizing 1.1.1 trichlorotrifluoroethane through chlorination, chlorine is added into halothane gas for further reaction to complete the production, and the steps are few. Meanwhile, the cost of raw materials is low, and the halothane is 27000Yuan / ton. The conversion rate is as high as 27 to 35 percent. The reaction time only needs 20 to 40 seconds, the yield is high, and 30 percent of the cost can be saved through being compared with that of other methods for synthesizing identical products.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a high-temperature gas-phase chlorination method for producing trifluorotrichloroethane. Background technique [0002] In the prior art, trichlorethylene is used as a raw material, hydrogen fluoride is used for gas phase reaction to generate 1.1.1-trifluorodichloroethane, and then photochlorination is carried out, and 1.1.1-trifluorotrifluoroethane is obtained by rectification after treatment. Ethyl chloride, the conversion rate is 22%~25%, has the following defects: [0003] 1. The price of raw materials is high, trichlorethylene is 40,000 yuan / ton, [0004] 2. There are many reaction steps, and the two-step reaction heat source is different. [0005] 3. The reaction conversion rate is low. Contents of the invention [0006] Aiming at the problems existing in the prior art, the present invention aims to provide a high-temperature gas-phase chlorination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/12C07C17/10C07C17/383
Inventor 解凤苗张其忠郝宗贤
Owner AZUREWAVE TEHNOLOGIES INC
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