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Method of making 1,1,1-trifluoroethane

A kind of technology of trifluoroethane and fluoroethane, applied in the field of preparation 1

Active Publication Date: 2008-03-26
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process example in this patent produces only 6.1% HFC-143a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A 1 gallon Parr autoclave with internal agitation was used. Antimony pentachloride was added to the autoclave. An equimolar amount of HF was added to partially fluorinate the antimony (without venting the autoclave), and the stirred reactor was heated to 90°C. A 75 / 25 (wt%) mixture of vinylidene chloride and HCFC-141b and 2.5 moles of HF per mole of organic was then fed into the autoclave. The autoclave was maintained at 90°C for 30 minutes. During this period the pressure rose to 530psig (37.263kg / cm 2 ). The reactor was then drained to a cold trap, washed and the reaction products analyzed. SbCl 5 The weight % ratio to HF is about 84 / 16. As a result, 91.33% was converted into 1,1,1-trifluoroethane (HFC-143a), and the by-product was 8.55% (limited to HFC-143a, HCFC-142b, HCFC-141b, HCC-140a or vinylidene chloride) compound of).

Embodiment 2

[0033] The reaction is the same as in Example 1, but the pressure is raised to 600 psig (42.484 kg / cm 2 ). As a result, 91.90% was converted into 1,1,1-trifluoroethane (HFC-143a), and the by-product was 8.06%.

Embodiment 3

[0035] The reaction was the same as Example 1, but with a 50 / 50% by weight mixture of vinylidene chloride and HCFC-141b as the organic feed and a 2.75:1 molar ratio of HF to organics was utilized. SbCl 5 The weight % ratio to HF is about 84 / 16. The pressure reaches 540psig (37.966kg / cm 2 ), and all reactants were kept in the batch reactor for 30 minutes. As a result, 71.43% was converted into 1,1,1-trifluoroethane (HFC-143a), and the by-product was 8.41%.

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PUM

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Abstract

A process for producing 1,1,1-trifluoroethane (HFC- 143a) which process comprises reacting hydrogen fluoride with vinylidene chloride along with one or more of 1,1,-dichloro-l-fluoroethane (HCFC-141b), l-chloro-l,l-difluoroethane (HCFC-142b) and 1,1,1-trichloroethane (HCC-140a) in the presence of pentavalent antimony as a fluorination catalyst under conditions to produce 1,1,1-trifluoroethane (HFC- 143a), generally in yields of 90% or more.

Description

field of invention [0001] The present invention relates to a process for preparing 1,1,1-trifluoroethane (HFC-143a). Instead of the conventional industrial process of feeding a liquid phase reactor system a pure component such as 1,1,1-trichloroethane (HCC-140a) as a feedstock, the present invention relates to the preparation of HFC-143a from an alternative organic feedstock which Contains 1,1-dichloroethylene (vinylidene chloride) and 1,1-dichloro-1-fluoroethane (HCFC-141b), 1-chloro-1,1-difluoroethane (HCFC-142b) And one or more combinations of 1,1,1-trichloroethane (HCC-140a). Background of the invention [0002] Mechanical refrigeration systems utilizing refrigerant fluids and associated heat transfer devices such as heat pumps and air conditioners are well known in the art for industrial, commercial and domestic applications. Chlorofluorocarbons (CFCs), developed in the 1930s, are used as refrigerants in such systems. However, since the 1980s, the impact of CFCs on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/21C07C17/20
CPCC07C17/206C07C17/21C07C19/08C07C17/20
Inventor D·C·马克尔R·C·约翰逊童雪松
Owner HONEYWELL INT INC
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