Method for producing sulfur hexafluoride by adopting sulfur tetrafluoride oxidation method

A technology of sulfur hexafluoride and sulfur tetrafluoride, which is applied in the fields of chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., and can solve problems such as the inability to obtain sulfur hexafluoride

Inactive Publication Date: 2012-01-25
TIANJIN TAIYUAN INDAL GAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is to overcome the deficiencies of the prior art. The prior art cannot obtain pure sulf

Method used

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  • Method for producing sulfur hexafluoride by adopting sulfur tetrafluoride oxidation method

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Embodiment 1

[0009] Sulfur tetrafluoride is prepared by reacting copper fluoride, silver fluoride or mercury fluoride or their mixture with molten sulfur, and the metal fluoride is converted into sulfide; then oxidize tetrafluoride with oxygen or air at 500-800°C Sulfur is obtained from sulfur hexafluoride, and sulfur dioxide is produced as a by-product; finally, metal sulfide reacts with hydrogen fluoride in the presence of oxygen and then converted into fluoride for recycling, and the by-product sulfur dioxide can be absorbed by sodium hydroxide solution and converted into sodium sulfite for recycling; among them, copper fluoride : silver fluoride: mercury fluoride weight fraction ratio is 1:1-1:1. See the process for details figure 1 .

Embodiment 2

[0011] Sulfur tetrafluoride is prepared by reacting copper fluoride, silver fluoride or mercury fluoride or their mixture with molten sulfur, and the metal fluoride is converted into sulfide; then oxidize tetrafluoride with oxygen or air at 500-800°C Sulfur is obtained from sulfur hexafluoride, and sulfur dioxide is produced as a by-product; finally, metal sulfide reacts with hydrogen fluoride in the presence of oxygen and then converted into fluoride for recycling, and the by-product sulfur dioxide can be absorbed by sodium hydroxide solution and converted into sodium sulfite for recycling; among them, copper fluoride : silver fluoride: mercury fluoride weight fraction ratio is 1:1-2:2. See the process for details figure 1 .

Embodiment 3

[0013] Sulfur tetrafluoride is prepared by reacting copper fluoride, silver fluoride or mercury fluoride or their mixture with molten sulfur, and the metal fluoride is converted into sulfide; then oxidize tetrafluoride with oxygen or air at 500-800°C Sulfur is obtained from sulfur hexafluoride, and sulfur dioxide is produced as a by-product; finally, metal sulfide reacts with hydrogen fluoride in the presence of oxygen and then converted into fluoride for recycling, and the by-product sulfur dioxide can be absorbed by sodium hydroxide solution and converted into sodium sulfite for recycling; among them, copper fluoride : silver fluoride: mercury fluoride weight fraction ratio is 1:2:1. See the process for details figure 1 .

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Abstract

The invention discloses a technology of producing sulfur hexafluoride by adopting a sulfur tetrafluoride oxidation method. The technology comprises the following steps of: firstly, reacting cupric fluoride, silver fluoride or mercuric fluoride or mixture of the cupric fluoride, the silver fluoride or the mercuric fluoride with molten sulfur to obtain sulfur tetrafluoride and converting metal fluoride into sulphide; secondly, oxidizing the sulfur tetrafluoride with oxygen or air at about 500DEG C to obtain the sulfur hexafluoride and a byproduct of sulfur dioxide; and finally, reacting the metal fluoride fluorine hydride in the presence of oxygen and converting the mixture into fluoride for recycling; and absorbing the byproduct of sulfur dioxide by using a sodium hydroxide solution and converting the mixed solution into sodium sulfite for recycling. The process is reasonable, simple in production and is a most simple and convenient ideal technology for preparing the sulfur hexafluoride.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technology for producing sulfur hexafluoride by the sulfur tetrafluoride oxidation method, which is suitable for producing sulfur hexafluoride. Background technique [0002] This product is one of the substances with the best known chemical stability, and its inertness is similar to that of nitrogen. It has excellent thermal stability, and it does not decompose even at temperatures above 500°C in its pure state. Sulfur hexafluoride has excellent electrical insulation and arc extinguishing properties. Under the same conditions, its insulation capacity is more than 2.5 times that of air and nitrogen, and its arc extinguishing capacity is 100 times that of air. The melting point of sulfur hexafluoride is -50.8°C, it can be used as a special refrigerant in the temperature range of -45~0°C, and because of its good heat resistance, it is a stable high-temperature heat carrier. Due to the above...

Claims

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Application Information

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IPC IPC(8): C01B17/45C01B17/50
Inventor 原东凤
Owner TIANJIN TAIYUAN INDAL GAS
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