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Method of preparing pentafluoroethane

A manufacturing method and technology of pentafluoroethane, applied in the direction of halogen substitution preparation, organic chemistry, etc., can solve the problems of low conversion rate of HCFC-133a and low selectivity of HCFC-123, achieve reduced catalyst poisoning, high catalyst activity, and reduced replacement or the effect of regeneration frequency

Inactive Publication Date: 2007-03-28
DAIKIN IND LTD
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Problems solved by technology

[0008] Also, although the reaction of HCFC-133a to HCFC-123 by photochlorination is known, this reaction is not preferred due to the low conversion rate of HCFC-133a and the low selectivity of HCFC-123

Method used

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  • Method of preparing pentafluoroethane
  • Method of preparing pentafluoroethane

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Embodiment

[0082] Tests were conducted on the reaction steps (a) and (b) in the production method of the present invention.

[0083] (Test 1) Reaction process (b) (1st reaction process)

[0084] A tubular nickel reaction tube having an inner diameter of 2 mm and a length of 12.1 m was maintained under the conditions of about 0.6 MPa and various temperatures shown in Table 1 . HCFC-133a and Cl preheated to about 200°C are made at flow rates of 180cc / min and 30cc / min respectively 2 into the above reaction tube.

[0085] Wash the reaction product (gas mixture) coming out of the reaction tube with a dilute alkaline aqueous solution warmed to 70°C in advance to remove HCl and Cl 2 . The composition of the mixture thus obtained was analyzed by gas chromatography with a hydrogen flame ionization detector (FID), and the conversion rate of HCFC-133a, the selectivity of HCFC-123 to CFC-113a, and the HCFC-1326 in the mixture were determined. concentration. In addition, the selectivity of HCFC-...

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Abstract

The present invention provides a novel method of preparing pentafluoroethane. The manufacturing method in accordance with the present invention comprises such reaction procedure where reaction materials containing 1,1,1-trifluoro-2,2-dichloroethane (HCFC-123) essentially exclusively 1,1,1,4,4,4-hexafluoro-2-chloro-2-butylene and 1,1,1,4,4,4-hexafluoro-2-fluoro-2-butylene are adopted. In the presence of a catalyst, a reaction between 1,1,1-trifluoro-2,2-dichloroethane and HF occurs in a gas phase and produces pentafluoroethane (HFC-125) final product.

Description

technical field [0001] The present invention relates to the manufacture method of pentafluoroethane (hereinafter also referred to as HFC-125), more specifically, the present invention relates to by 1,1,1-trifluoro-2,2-dichloroethane (hereinafter also referred to as Process for making HFC-125 for HCFC-123). Background technique [0002] HFC-125 is useful as a chlorine-free alternative fluorocarbon used in, for example, refrigerants, hybrid refrigerants (R-410A, R-407C, R-404A), blowing agents, propellants, and the like. [0003] HFC-125 is produced by reacting HCFC-123 with HF. As the production method of HFC-125 including this reaction, the production method consisting of the following three-stage reaction steps can be mentioned: using trichloroethylene (hereinafter also referred to as TrCE) as the starting material, and sequentially passing through 1, 1 , 1-trifluoro-2-chloroethane (hereinafter also referred to as HCFC-133a) and HCFC-123 to give HFC-125. [0004] In the ...

Claims

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Application Information

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IPC IPC(8): C07C17/20C07C19/08
Inventor 能势雅聪高桥一博吉村俊和
Owner DAIKIN IND LTD
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