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Production method of pentafluoroethane

A production method and technology of pentafluoroethane, applied in the field of synthesis of pentafluoroethane, can solve the problem that the yield of pentafluoroethane cannot exceed 35%, and achieve low equipment requirements, mild reaction conditions, and simple process Effect

Inactive Publication Date: 2006-01-25
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that although the yield of hydrogen-containing compounds is high, the yield of pentafluoroethane fails to exceed 35% even at a temperature as high as 400 °C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 2-liter stainless steel autoclave, add 450 grams (2.4 mol) of tri-n-butylamine and 58 grams (1.0 mol) of acetone, cool to 0°C, and slowly introduce 160 grams of anhydrous hydrogen fluoride ( 8.0 mol), cooled to -10°C, and added 300 g (3.0 mol) of tetrafluoroethylene. Raise the temperature to 80°C, stir under a pressure of 1Mpa, and react for 4 hours. GC analysis shows that the conversion rate of tetrafluoroethylene is 99.9%. The gaseous product is collected to obtain 356.4 grams of product. GC and MS analysis show that it is pentafluoroethane with a purity of 99.0%. .

Embodiment 2

[0022] In a 2-liter stainless steel autoclave, add 400 grams (3.96 mol) of triethylamine and 250 grams (2.6 mol) of cyclohexanone, cool to 0°C, and slowly introduce 200 grams of anhydrous hydrogen fluoride under stirring and cooling conditions (10.0mol) and 500 grams (5.0mol) of tetrafluoroethylene. The temperature was raised to 130° C., stirred under a pressure of 1.5 MPa, and reacted for 9 hours to obtain 599.4 grams of product. GC and MS analysis showed that the conversion rate of tetrafluoroethylene was 99.9%, and the product was pentafluoroethane with a purity of 99.9%.

Embodiment 3

[0024] In a 2-liter carbon steel packed tower reactor, add 500 grams (3.5 mol) of tri-n-propylamine and 1200 grams (10 mol) of acetophenone, and slowly feed 560 grams (28.0 mol) of anhydrous hydrogen fluoride at a temperature of 70°C mol). This system is heated up to 145 DEG C, is stirred under pressure 1.8Mpa for 2 hours and slowly feeds 600 grams (6.0mol) of tetrafluoroethylene, separates and obtains 718.6 grams of product, and the GC analysis of gained product shows that tetrafluoroethylene conversion rate is 99.8%, The product is pentafluoroethane with a purity of 99.9%.

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Abstract

The invention relates to a process for synthesizing pentafluoroethane (HFC-125) from tetrafluoroethylene and hydrogen fluoride at the presence of catalyst, wherein the catalyst is a dual system comprising tertiary amine compounds and carbonyl-containing compounds by the proportion of 1:0.05-10, the reaction condition being, the reaction temperature 10-150 deg. C, the reaction pressure 0.6-2.5 MPa, the reacting time 1-10 hours. The invention can realize high conversion rate of tetrafluoroethylene and good selectivity of pentafluoroethane.

Description

technical field [0001] The invention relates to a synthesis method of pentafluoroethane, in particular to a method for producing pentafluoroethane by using tetrafluoroethylene and hydrogen fluoride as raw materials under a binary catalyst. [0002] <chemistry num="001"> <chem file="200410035429_cml001.xml" / > < / chemistry> Background technique [0003] Pentafluoroethane (HFC-125), a useful fluorinated hydrocarbon compound because it does not deplete the ozone layer, is used in refrigerants, blowing agents, solvents, propellants, and dry etchants, among others. [0004] The known manufacturing method of HFC-125 is to make 1,1-dichloro-2,2,2-trifluoroethane (HFC- 123), HCFC-124 and HFC-125 (see International Patent Application Publication No. WO 92 / 16479). Here, it is disclosed that as a catalyst for gas phase reaction, it is a catalyst supporting metals such as zinc and / or chromium on alumina and / or aluminum fluoride, the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/087
Inventor 于修源张希功宋淑伟
Owner SHANDONG DONGYUE POLYMER MATERIAL
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