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Preparation method for pentafluoroethane

A technology for pentafluoroethane and trifluoroethane, which is applied in the field of preparation of pentafluoroethane, can solve the problems of high raw material cost or operating cost, and that pentafluoroethane has no market competitiveness, and achieves the raw material cost or operating cost. falling effect

Active Publication Date: 2014-04-16
CHANGSHU 3F FLUOROCHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the process route recorded in the above literature is that the raw material of pentafluoroethane (HFC125) is mainly tetrachloroethylene or tetrafluoroethylene, which leads to high raw material cost or operating cost, so that the pentafluoroethane produced by this process has no market competition force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Load 2 kg of catalyst in 10 liters of stainless steel reaction, which contains 600 grams of difluoroantimony trichloride and 1400 grams of trifluoroantimony dichloride. The temperature was raised to 80°C. After trifluoroethane, hydrogen fluoride and chlorine mix, drop into reactor, the feeding speed of trifluoroethane is 160 grams / hour, and the feeding speed of hydrogen fluoride is 152 grams / hour, and the feeding amount of chlorine is 270 grams / hour. Keep the reaction pressure at 1.6MPa. After the reaction product was washed with water and alkali and dried, it was rectified to obtain pentafluoroethane with a purity of 99.5%. The amount of pentafluoroethane collected per hour is 217.93 grams, and the yield of pentafluoroethane calculated according to the amount of trifluoroethane is 90.80%.

Embodiment 2

[0020] Add 2 kg of catalyst into 10 liters of stainless steel reaction, which contains 1000 grams of difluoroantimony trichloride and 1000 grams of trifluoroantimony dichloride. The temperature was raised to 100°C. After trifluoroethane, hydrogen fluoride and chlorine mix, drop into reactor, the feeding speed of trifluoroethane is 160 grams / hour, and the feeding speed of hydrogen fluoride is 190 grams / hour, and the feeding amount of chlorine is 160 grams / hour. Keep the reaction pressure at 1.5MPa. After the reaction product was washed with water and alkali and dried, it was rectified to obtain pentafluoroethane with a purity of 99.8%. The amount of pentafluoroethane collected per hour is 221.35 grams, and the yield of pentafluoroethane calculated according to the amount of trifluoroethane is 92.23%.

Embodiment 3

[0022] Add 2 kg of catalyst into 10 liters of stainless steel reaction, which contains 800 grams of difluoroantimony trichloride and 1200 grams of trifluoroantimony dichloride. The temperature was raised to 150°C. After trifluoroethane, hydrogen fluoride and chlorine are mixed, drop into reactor, the feeding speed of trifluoroethane is 160 grams / hour, and the feeding speed of hydrogen fluoride is 267 grams / hour, and the feeding amount of chlorine is 338 grams / hour. Keep the reaction pressure at 2.5MPa. After the reaction product was washed with water and alkali and dried, it was rectified to obtain pentafluoroethane with a purity of 99.7%. The amount of pentafluoroethane collected per hour is 198.22 grams, and the yield of pentafluoroethane calculated according to the amount of trifluoroethane is 82.59%.

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Abstract

The invention discloses a preparation method for pentafluoroethane, which includes the following steps: subjecting trifluoroethane, chlorine and hydrogen fluoride to a gas phase catalysis reaction at the temperature between 80 DEG C and 200 DEG C, wherein the molar ratio of the trifluoroethane and the hydrogen fluoride is 1: (4-10), and the molar ratio of the trifluoroethane and the chlorine is 1 :( 2.0-3.0). According to the preparation method for the pentafluoroethane, the whole process is the obtaining of the pentafluoroethane (HFC125) from the trifluoroethane, thereby the problem that a way of using tetrafluoroethylene or tetrachloroethylene to serve as a raw material results in greatly increasing of the raw material costs or operating costs of the whole process is prevented.

Description

technical field [0001] The invention relates to a preparation method of pentafluoroethane (HFC125). Background technique [0002] Pentafluoroethane (HFC125) has an ozone destruction coefficient of 0 and is currently used as a substitute for chlorodifluoromethane (HCFC22) and is widely used in the field of refrigeration. At present, the global annual output is about 60,000 tons. The main production route uses tetrafluoroethylene or tetrachloroethylene as the main raw material. Due to the high manufacturing cost of tetrafluoroethylene, pentafluoroethane produced by the tetrafluoroethylene route is on the market. There is almost no competitive advantage, but unfortunately, this process route is almost always used in China. [0003] The process route of direct gas-phase fluorination of tetrachloroethylene as raw material to produce pentafluoroethane, because olefins directly enter the gas-phase catalyst, the catalyst is prone to failure, and at the temperature of gas-phase fluo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/08C07C17/10
Inventor 司林旭张平忠顾和祥
Owner CHANGSHU 3F FLUOROCHEM IND CO LTD