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Method for preparing hexafluoroethane

A technology of hexafluoroethane and monochloropentafluoroethane, which is applied in the field of preparation of hexafluoroethane, can solve the problems of severe heat release, poor catalyst selectivity, and difficulties in industrial production

Inactive Publication Date: 2013-06-05
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (5) Tyczkowski et al. reported (Journal of the American Chemical Society, 77, 3007-8; 1955) to prepare hexafluoroethane by reacting ethane with fluorine gas, but the reaction exotherm was serious and industrialization was difficult;
[0010] In the above method, the exothermic heat is serious when fluorine gas is used, the industrial production is difficult, and the selectivity of the catalyst is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] For pentafluoroethane industrialized units, mixtures of pentafluoroethane, monochloropentafluoroethane, dichlorotetrafluoroethane, tetrafluoroethane, trifluoroethane, extractant and other mixtures obtained through extraction and separation, after purification Distillation, drying, gas chromatographic analysis of the distillate, the results are as listed in Table 1, the composition of crude chloropentafluoroethane, no chlorotrifluoromethane was detected.

[0028] Table 1

[0029] composition CF 3 CHF 2 CF 3 CH 2 f CF 3 CCIF 2 CF 3 CCl 2 f Content (V%) 0.74 0.05 98.26 0.95

preparation Embodiment 1

[0030] Catalyst preparation example 1: Cr-Mg-Al catalyst

[0031] Chromium chloride and magnesium nitrate are dissolved in pure water, wherein the weight ratio of chromium:magnesium is 19:1, and a mixed solution with a concentration of 20% is made, and reacted with ammonia solution with a concentration of 5%, and the pH value of the reaction solution is 8.5~ Stop adding ammonia water at 9.5, filter the resulting hydroxide precipitate, wash thoroughly with pure water, then dry the obtained co-precipitate at 120°C, knead with aluminum fluoride:precipitate at a weight ratio of 1:5, and extrude with an extruder The strips are formed, and the strip particles made are loaded into the catalyst burner, and the N 2 Ignition in air flow (gradually increase the temperature to 400°C) to obtain the catalyst precursor. Cool down to 100°C with nitrogen gas, start to use N 2 Dilute HF atmosphere for fluorination (gradually increase the temperature to 450°C), pass N after fluorination 2 C...

preparation Embodiment 2

[0032] Catalyst preparation example 2: Cr-Al catalyst

[0033] Dissolve chromium chloride in pure water to make a solution of 20% concentration, and react with 5% ammonia solution by stirring. When the pH value of the reaction solution is 8.5 to 9.0, stop adding 5% ammonia water, and filter the produced hydrogen to oxidize The precipitate was washed thoroughly with pure water, and then the obtained precipitate was dried at 120°C. The aluminum fluoride and the precipitate were kneaded at a weight ratio of 1:5, extruded with an extruder, and the strip-shaped particles were packed into Catalyst burner, in N 2 Ignition in air flow (gradually increase the temperature to 400°C) to obtain the catalyst precursor. Cool down to 100°C with nitrogen gas, start to use N 2 Dilute HF atmosphere for fluorination (gradually increase the temperature to 450°C), pass N after fluorination 2 Cool down to room temperature, seal the package, and prepare for use.

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PUM

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Abstract

The invention discloses a method for preparing hexafluoroethane taking chloropentafluoroethane as raw materials. The method comprises the steps: carrying out a gas-phase reaction between a chloropentafluoroethane gas stream and a hydrogen fluoride gas stream under the action of a Cr catalyst or a Cr-Mg catalyst or a Cr-Al catalyst or a Cr-Mg-Al catalyst, and generating the hexafluoroethane. The chloropentafluoroethane gas stream used by the method can contain impurities of lower than 5%. The preparation method has the advantages of being easy and convenient to operate, easy to apply in industrialization, high in selectivity, high in conversion rate and the like.

Description

Technical field [0001] The present invention involves a method of preparation of ethylene, especially the method of preparing hex fluoride as a raw material for raw materials. Background technique [0002] Tirofluoride is a very useful fluoride -containing chemical. As a refrigerant, it is mainly used for mixing R508A or R508B; it can be used for cleaning and etching of electronic products; there are also a small amount of applications in the medical field. [0003] There are mainly the following reports on the preparation of hexubefluoro ethane: [0004] (1) CN1165803 reported the carbonide carbonide containing two carbon atoms as the raw material, and at a higher temperature at a higher temperature, the reaction of the diluted gases was reacted to prepare hexurobenerhoids; [0005] (2) CN1561319, WO198240 reported the method of preparing hexofluorophooth alumane with chlorolytic compounds, that is, under the presence of fluoride catalysts, the raw material and hydrogen fluoride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20B01J27/132
Inventor 郭荔毛汉卿楼华东赵翀史婉君徐小炯
Owner SINOCHEM LANTIAN
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