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A method of preparing hexafluoroethane at high temperature

A technology of hexafluoroethane and pentafluoroethane, which is applied in the field of preparing hexafluoroethane at high temperature, can solve the problems of low product concentration, slow reaction speed, and high corrosiveness of raw materials, and achieve high impurity concentration and low impurity content , The effect of high product yield

Active Publication Date: 2016-04-06
PERIC SPECIAL GASES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above methods, there are different problems, such as low yield, harsh process conditions, expensive reactor, high risk of operation, high corrosiveness of raw materials used, slow reaction speed, low product concentration, etc.
Especially, method (1), method (4), method (5) and method (6) all use fluorine gas as a raw material, which is dangerous and relatively poor in safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 100L of cobalt fluoride into the tubular reactor, control the temperature of the reactor to 350°C and the pressure to 0.15MPa, and then add a mixture of nitrogen trifluoride with a flow rate of 1.74L / min and nitrogen gas with a flow rate of 17.4L / min Gas, pentafluoroethane with a flow rate of 0.87L / min. At this time, the space velocity of the gas in the cobalt oxide bed layer is 0.2 / min. After the reaction product comes out of the reactor, the hexafluoroethane is obtained.

[0028] The reaction product obtained above was analyzed by gas chromatography, and the analysis results are shown in Table 1. It can be calculated that the yield of hexafluoroethane is 13%.

[0029] Table 1 reaction product analysis result

[0030] components

Embodiment 2

[0032] Add 100L cobalt fluoride into the tubular reactor, control the temperature of the reactor at 450°C and the pressure at 0.1MPa, and then add the mixed gas of nitrogen trifluoride with a flow rate of 4.9L / min and nitrogen gas with a flow rate of 490L / min . Pentafluoroethane with a flow rate of 4.9 L / min. At this time, the space velocity of the gas in the cobalt oxide bed is 5 / min. After the reaction product comes out of the reactor, the hexafluoroethane is obtained.

[0033] The reaction product obtained above was analyzed by gas chromatography, and the analysis results are shown in Table 2. It can be calculated that the yield of hexafluoroethane is 74%.

[0034] Table 2 reaction product analysis results

[0035] components

Embodiment 3

[0037] Add 100L of cobalt fluoride into the tubular reactor, control the temperature of the reactor at 430°C and the pressure at 0.1MPa, and then add a mixture of nitrogen trifluoride with a flow rate of 3.87L / min and nitrogen gas with a flow rate of 193.5L / min Gas, pentafluoroethane with a flow rate of 2.58 / min. At this time, the space velocity of the gas in the cobalt oxide bed layer is 2 / min. After the reaction product comes out of the reactor, the hexafluoroethane is obtained.

[0038] The reaction product obtained above was analyzed by gas chromatography, and the analysis results are shown in Table 3. It can be calculated that the yield of hexafluoroethane is 79%.

[0039] Table 3 reaction product analysis results

[0040] components

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PUM

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Abstract

The invention relates to a method of preparing hexafluoroethane at high temperature and belongs to the technical field of fluorine chemical engineering. The method includes adding cobaltous fluoride into a reactor, controlling the temperature of the reactor to be 350-450 DEG C and pressure of the reactor to be 0.1-0.15 MPa, adding a gas mixture of nitrogen trifluoride and nitrogen and pentafluoroethane, with the gas space velocity in a cobaltous oxide bed layer being 0.2-5 / min, and discharging a reaction product from the reactor to obtain the hexafluoroethane. Raw materials used in the method are safe. The method is safe in operation, high in product yield and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing hexafluoroethane at high temperature, belonging to the technical field of fluorine chemical industry. Background technique [0002] Hexafluoroethane is an important chemical product, mainly used in integrated circuit etching and cleaning, refrigeration, high dielectric strength cooling, etc. At present, the methods for preparing hexafluoroethane are as follows: [0003] (1) In the patent CN00118734.1, cobalt difluoride is contacted with fluorine gas to be activated into cobalt trifluoride, and hydrofluoroethane is converted into perfluoroethane through the activated cobalt trifluoride catalyst at 300-350°C ; [0004] (2) In the patent CN1165803A, fluorine gas reacts with a hydrofluorocarbon with two carbon atoms in the presence of a diluent at high temperature; [0005] (3) In the patent CN1651370, in the presence of a fluorination catalyst, the mixed gas of hexafluoroethane and chlorotrifluoromethane ...

Claims

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Application Information

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IPC IPC(8): C07C17/10C07C19/08
CPCC07C17/10C07C19/08
Inventor 徐海云黄华璠乔蓓蓓纪振红张净普孟祥军罗建志
Owner PERIC SPECIAL GASES CO LTD
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