A kind of electrolytic preparation method of sulfur hexafluoride

A technology of sulfur hexafluoride and sulfur tetrafluoride, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of easy adhesion of anode gas and drop in the conductive current of the electrolytic system, so as to prevent the sharp drop of the conductive current and ensure normal effect

Active Publication Date: 2017-08-29
江西华晨食品有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In the existing technology of producing sulfur hexafluoride by ammonium bifluoride electrolysis, the anode effect is mainly due to the carbon-fluorine film on the surface of the carbon electrode. Although the carbon-fluorine film is conductive, the anode gas is easy to adhere to the carbon-fluorine film, causing the entire The conduction current of the electrolytic system drops sharply, and more efficient electrodes need to be found

Method used

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  • A kind of electrolytic preparation method of sulfur hexafluoride
  • A kind of electrolytic preparation method of sulfur hexafluoride

Examples

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Effect test

Embodiment 1

[0022] Step 1, preparation of nano-cerium oxide modified carbon electrode

[0023] In the reactor, add 100Kg nano-cerium oxide, 1200Kg (mass percentage concentration: 10) sulfuric acid, 0.3Kg 4-bromoboric acid diazonium tetrafluoroborate, mix for 30 minutes to prepare a suspension; put the carbon electrode into the suspension Soak in the liquid for 50 hours, then add 300Kg meta-porphyrin dimethyl ester, 0.3Kg cobalt acetate, soak for 60 hours at 50°C, take it out and dry it to prepare nano-cerium modified carbon electrode.

[0024] Step 2, the preparation of sulfur hexafluoride

[0025] Sulfur tetrafluoride and hydrofluoric acid are made into an electrolyte in a molar ratio of 3:1 and continuously injected into the electrolytic cell. The anode of the electrolytic cell is the nano-cerium-modified carbon electrode in step 1. The electrolysis temperature is -50°C, the pressure is 3Mpa, and the voltage is 30V. Anode generated gas contains SF 6 , SF 4 As well as some trace impur...

Embodiment 2

[0027] Step 1, preparation of nano-cerium oxide modified carbon electrode

[0028] In the reactor, add 100Kg nanometer cerium oxide, 1000Kg (mass percent concentration: 5) sulfuric acid, 0.1Kg 4-bromoboric acid diazonium tetrafluoroborate, mix for 10 minutes to prepare a suspension; put the carbon electrode into the suspension Soak in the solution for 20 hours, then add 100Kg meta-porphyrin dimethyl ester, 0.1Kg cobalt acetate, soak for 20 hours at 20°C, take it out and dry it to prepare nano-cerium modified carbon electrode.

[0029] Step 2, the preparation of sulfur hexafluoride

[0030] Sulfur tetrafluoride and hydrofluoric acid are formulated as an electrolyte in a molar ratio of 1:1 and continuously injected into the electrolytic cell. The anode of the electrolytic cell is the nano-cerium-modified carbon electrode in step 1. The electrolysis temperature is -60°C, the pressure is 0.5Mpa, and the voltage is 20V. , the anode gas contains SF 6 , SF 4 As well as some trace ...

Embodiment 3

[0032] Step 1, preparation of nano-cerium oxide modified carbon electrode

[0033] In the reactor, add 100Kg nano-cerium oxide, 1500Kg (mass percentage concentration: 20) sulfuric acid, 0.5Kg 4-bromoboric acid diazonium tetrafluoroborate, mix for 50 minutes to prepare a suspension; put the carbon electrode into the suspension Soak in the solution for 80 hours, then add 500Kg meta-porphyrin dimethyl ester, 0.5Kg cobalt acetate, soak for 80 hours at 60°C, take it out and dry it to prepare nano-cerium modified carbon electrode.

[0034] Step 2, the preparation of sulfur hexafluoride

[0035] Sulfur tetrafluoride and hydrofluoric acid are made into an electrolyte in a molar ratio of 6:1 and continuously injected into the electrolytic cell. The anode of the electrolytic cell is the nano-cerium-modified carbon electrode in step 1. The electrolysis temperature is -30°C, the pressure is 5Mpa, and the voltage is 50V. Anode generated gas contains SF 6 , SF 4 As well as some trace imp...

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Abstract

The invention provides a method for electrolytic preparation of sulfur hexafluoride. The method comprises the following steps: preparing a nanometer cerium-modified carbon electrode to serve as an electrolytic reaction anode; preparing an electrolyte from sulfur tetrafluoride and hydrofluoric acid, and continuously injecting the electrolyte into an electrolytic cell, wherein the anode of the electrolytic cell is the prepared nanometer cerium-modified carbon electrode; carrying out electrolysis under the conditions of proper electrolytic temperature, pressure and voltage, wherein the gas generated by the anode contains SF6, SF4 and a few of trace impurities; and carrying out series refining technologies including impurity fluorine removal and acid impurity removal known in the industry on the mixed gas, adsorbing the SF6 through a molecular sieve, and carrying out an impurity-removal refining technology known in the industry on the adsorbed SF6 to obtain the high-purity sulfur hexafluoride product.

Description

technical field [0001] The invention relates to a method for preparing sulfur hexafluoride, in particular to a method for electrolytically preparing sulfur hexafluoride. Background technique [0002] Industrial SF 6 It is usually prepared by reacting fluorine produced by electrolysis with sulfur at high temperature, except for SF 6 In addition, a small amount of by-products are also generated. The various implementations are similar, but the electrolyte is different. SF can be obtained by electrolyzing inorganic covalent sulfides such as hydrogen sulfide, carbon disulfide, and sulfur chloride in the presence of anhydrous hydrogen fluoride and a strong conductive solute (such as sodium fluoride). 6 . This method consumes a lot of power, and because there are more gas by-products, SF 6 The separation and purification are also very complicated. The anode material of the electrolysis method is mainly nickel, but the nickel anode corrodes faster, pollutes the electrolyte, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/24C25B11/14
CPCC25B1/245C25B11/044
Inventor 王琪宇王新
Owner 江西华晨食品有限公司
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