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Production method of hexafluoroethane

A kind of technology of hexafluoroethane and chloropentafluoroethane, applied in the field of production technology of hydrofluorocarbons, can solve problems such as azeotrope

Active Publication Date: 2016-07-13
陕西中化蓝天化工新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of purifying and refining hexafluoroethane, there will be problems similar to the azeotropy of chlorotrifluoromethane and hexafluoroethane

Method used

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  • Production method of hexafluoroethane

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A nickel-based alloy tube with an inner diameter of 25 mm is filled with 60 ml of a chromium-based catalyst (containing magnesium and the mass ratio of magnesium to chromium is about 2%). Introduce nitrogen and hydrogen fluoride to carry out catalyst treatment for 16 hours. Then feed 20 ml / min of dichlorotetrafluoroethane and 5 ml / min of hydrogen fluoride into the reactor. The reaction conditions are: the molar ratio of hydrogen fluoride and tetrafluorodichloroethane is 3:1, the reaction temperature is 360°C, the contact time is 50s, and the reaction pressure is 0.2MPa. Table 1 shows the conversion rate of R114 and selectivity of R115 and R116 obtained at reaction temperatures of 360°C, 380°C, 390°C, and 400°C.

[0022] Table 1 Comparison of experimental data

[0023]

Embodiment 2

[0025] In a stainless steel tube with an inner diameter of 50 mm, the outer wall is heated by an electric heating wire, and 200 ml of a chromium-based catalyst (containing aluminum and the mass ratio of aluminum to chromium is about 2%) is filled inside. The other reactor is in a nickel-based alloy tube with an inner diameter of 25mm, the heating method is molten salt heating, and 60ml of chromium-based catalyst is filled inside. Both reactors were fed with nitrogen and hydrogen fluoride for catalyst treatment for 16 hours. Then, 30 ml / min of dichlorotetrafluoroethane and 7 ml / min of hydrogen fluoride were fed into the reactor. The first reactor is connected in series with the second reactor. The basic conditions of the reaction are: the molar ratio of hydrogen fluoride to tetrafluorodichloroethane is 4:1, the first reaction temperature is 360°C, the contact time is 50s, and the reaction pressure is 0.2MPa. The second reaction temperature is 400° C., the contact time is 80 s...

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Abstract

The invention discloses a production method of hexafluoroethane. Dichlorotetrafluoroethane is taken as a raw material and two-stage circulation technology is adopted. Chloropentafluoroethane is generated in a first-stage reaction, and hexafluoroethane is generated in a second-stage reaction. According to the production method provided in the invention, a hexafluoroethane product with purity more than 99.9% is obtained.

Description

technical field [0001] The invention relates to a production process of hydrofluorocarbons, in particular to a process for producing hexafluoroethane. Background technique [0002] High-purity hexafluoroethane can be used as a special gas for electronics, as a cleaning gas or etching gas. For its preparation method, report has following several kinds at present: [0003] (1) In the presence of a fluorination catalyst, using chloropentafluoroethane as a raw material, reacting with hydrogen fluoride to prepare hexafluoroethane; [0004] (2) Direct fluorination of tetrafluoroethane and / or pentafluoroethane with fluorine gas. [0005] When the method (1) is adopted, the raw material chloropentafluoroethane is basically a by-product in the production of hydrofluorocarbons, such as a by-product in the production of pentafluoroethane. When chloropentafluoroethane is a by-product, it will contain a variety of organic impurities. If you want to use it as a raw material to prepare ...

Claims

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Application Information

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IPC IPC(8): C07C19/08C07C17/20
Inventor 柴华杨会娥李峰王民涛赵新堂
Owner 陕西中化蓝天化工新材料有限公司
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