Method for producing 1,1,1-trifluoro-ethane

A technology of trifluoroethane and trichloroethane, applied in 1 field, can solve problems such as many by-products, fast catalyst deactivation rate, and reactor corrosion

Inactive Publication Date: 2007-09-05
江西百炼氟材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above-mentioned preparation methods of HFC-143a, the liquid phase method has the disadvantages of severe reactor corrosion and many by-products, while the gas phase method has high reaction temperature and catalyst Insufficiency such as faster inactivation rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 50ml of Cr to a carbon steel pipe with an inner diameter of 38mm 2 o 3 Catalyst, pre-fluorinate the catalyst with a mixture of nitrogen and hydrogen fluoride at 350°C for 10 hours, and then lower the temperature to 200°C. Feed HF and HCC-140a to react, control the molar ratio of HF to HCC-140a to be 5:1, and the contact time is 6 seconds. After 20 hours of reaction, the reaction product is washed with water and alkali to remove HCl and HF, and is analyzed by gas chromatography. The conversion rate of HCC-140a and the selectivity of HFC-143a were analyzed, and the results are shown in Table 1.

Embodiment 2

[0020] Same operation as Example 1, the difference is that the fluorination catalyst is 10% Cr 3+ / AlF 3 , and the reaction results are shown in Table 1. Cr 3+ / AlF 3 The catalyst was prepared by impregnating AlF with an aqueous solution of chromium chloride 3 The carrier is prepared.

Embodiment 3

[0022] Same operation as Example 1, the difference is that the fluorination catalyst is 10% Cr 3+ / MgF 2 , and the reaction results are shown in Table 1. Cr 3+ / MgF 2 The catalyst was prepared by impregnating MgF with an aqueous solution of chromium chloride 2 Prepared.

[0023] Example

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PUM

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Abstract

A process for preparing 1,1,1-trifluoroethane (HFC-143a) features the gas-phase reaction between HF and 1,1,1-trichloroethane (HCC-140a) under the existence of fluorinating Cr-base catalyst at 150-280 deg.C. It has high output rate and selectivity.

Description

technical field [0001] The present invention relates to a kind of preparation method of 1,1,1-trifluoroethane (HFC-143a), especially relate to a kind of with hydrogen fluoride and 1,1,1-trichloroethane (HCC-140a) as raw material, in The invention discloses a preparation method for obtaining 1,1,1-trifluoroethane by gas-phase fluorination reaction in the presence of a fluorination catalyst. Background technique [0002] 1,1,1-Trifluoroethane is a fluorinated hydrocarbon compound that is safe for the atmospheric ozone layer. It is currently mainly used as a substitute for chlorodifluoromethane (HCFC-22) refrigerants. Foaming agents, solvents, propellants, fire extinguishers and dry etchants. [0003] Among the known methods for synthesizing HFC-143a using HCC-140a as a raw material, US Pat. No. 6,630,610 discloses a method for synthesizing HFC-143a by liquid phase fluorination of HCC-140a in the presence of antimony pentachloride. WO96 / 05156 discloses a method for synthesizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20B01J27/132
Inventor 张伟吕剑寇联岗石磊何飞李凤仙
Owner 江西百炼氟材料有限公司
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