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Method for purifying fluorine gas

A purification method, the technology of fluorine gas, which is applied in the field of halogen purification, can solve problems such as difficulty, and achieve the effects of increased cost, convenient control system, and simple equipment structure

Inactive Publication Date: 2013-03-13
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HF also needs to be added to the device, and water and air need to be removed, resulting in difficulties in actual operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The heat exchange device is a tube heat exchanger, and the refrigerant (cooling medium) is liquid nitrogen.

[0029] The adsorption tower is a sieve tray tower, and porous sodium fluoride is placed on the tray.

[0030] The electrolytic cell of molten electrolyte salt (KF-2HF) is heated to 100°C, the operating pressure of the electrolytic cell is 0.05MPa, and the pressure of the heat exchanger is the same as that of the electrolytic cell. Fluorine and hydrogen elements are formed on the anode and cathode electrodes, respectively. The fluorine gas at the outlet of the anode enters the heat exchanger through the bottom of the heat exchanger, the temperature of the refrigerant inlet of the heat exchanger is controlled at -80°C, and the purity of the fluorine gas at the outlet of the heat exchanger is 99.3%. Among them, the HF content is 0.4%, and there is a small amount of CF 4 . The fluorine gas then passes through the porous sodium fluoride adsorption tower for adsorp...

Embodiment 2

[0033] Purification operation equipment is the same as embodiment 1.

[0034] The electrolyzer of molten electrolyte salt (KF-2HF) is heated to 90°C. The operating pressure of the electrolytic cell is 0.2MPa, and the pressure of the heat exchanger is the same as that of the electrolytic cell. Fluorine elements and hydrogen elements are formed on the respective electrodes. The fluorine gas at the outlet of the anode enters the heat exchanger through the bottom of the heat exchanger, the temperature of the refrigerant inlet of the heat exchanger is controlled at -40°C, and the purity of the fluorine gas at the outlet of the heat exchanger is 96.8%. Among them, the HF content is 2.7%. The fluorine gas then passes through the porous sodium fluoride adsorption tower for adsorption reaction. The treated fluorine gas was measured: the fluorine gas content was 99.7%, and HF was not detected. The detection accuracy is 10ppm level.

Embodiment 3

[0036] The heat exchanger is a casing heat exchanger, and the refrigerant (cooling medium) is perfluoroisopropyl ether. The heat exchanger is filled with bulk stainless steel Raschig ring packing.

[0037] The adsorption tower is a sieve tray tower, and a mixture of porous sodium fluoride and potassium fluoride is placed on the tray with a mass ratio of 1:1.

[0038] The electrolytic cell of molten electrolyte salt (KF-2HF) is heated to 100°C, and the operating pressure of the electrolytic cell is 0.45MPa. Fluorine and hydrogen elements are formed on the anode and cathode electrodes, respectively. The fluorine gas at the outlet of the anode enters the heat exchanger through the bottom of the heat exchanger, the temperature of the refrigerant inlet of the heat exchanger is controlled at -30°C, and the purity of the fluorine gas at the outlet of the heat exchanger is 97.4%. The HF content is 2.3%, a small amount of CF 4 . The fluorine gas is then adsorbed by porous sodium fl...

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PUM

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Abstract

The invention provides a method for purifying fluorine gas, wherein the fluorine gas is obtained by electrolyzing fuse salt in an electrolyzer, and the fluorine gas to be purified, obtained through electrolysis, is introduced into a heat exchange device having the operation pressure being 0-0.5MPa and the internal temperature being minus 10 DEG C to minus 100 DEG C, and is then adsorbed by a fluoride. According to the method provided by the invention, the pressure of the heat exchange device and the pressure of an electrolytic bath are the same, so that the system is convenient to control; the equipment is simple in structure, and conventional heat exchanger and adsorption column can be used without increasing the reforming cost; and with the adoption of the method disclosed by the invention, the fluorine gas without HF can be obtained after fluorine preparation based on electrolysis, and HF can be recovered at the same time.

Description

technical field [0001] The invention belongs to the field of non-metallic elements, and in particular relates to a method for purifying halogens. Background technique [0002] Fluorine is the most electronegative element in nature and the strongest elemental oxidant. At room temperature, it is a light yellow gas with strong corrosiveness. The known method for preparing fluorine gas by electrolysis of potassium hydrogen fluoride solution by medium temperature method has been widely applied in industry. [0003] Elemental fluorine (F 2 ) has a wide range of uses, for example, it is used as an etchant or cleaning agent in the manufacture of semiconductor devices, micro-motors, solar cells, and thin-film transistors; it is used to manufacture IF5 and SF6; it is also used to treat the surface of plastic materials, such as fluorinated inner surfaces, external surfaces or tanks; another field of application is parts made of surface treated polymers. At present, most fluorine ga...

Claims

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Application Information

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IPC IPC(8): C01B7/20
Inventor 孙凌云张德波庹洪田勇叶泉
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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