Fluorine gas production method

A manufacturing method and a fluorine gas technology, which are applied in the field of fluorine gas manufacturing, can solve the problem of high temperature of the reaction field, and achieve the effects of not easy performance deterioration and stable electrolysis

Pending Publication Date: 2022-01-07
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This direct fluorination reaction is an exothermic reaction that generates a large amount of heat of reaction, so the temperature of the reaction field tends to increase

Method used

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Experimental program
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Effect test

Embodiment 1

[0083] As a fluorination reaction, fluorine gas is reacted with 1,2,3,4-tetrachlorobutane (hereinafter referred to as "TCB") as a raw material compound to synthesize 1,1,2,3,4, which is the main fluoride compound. , 4-hexafluoro-1,2,3,4-tetrachlorobutane (boiling point 134 ° C) reaction.

[0084] In volume 4m 3 4700kg (2.8m 3 ) of the reaction solution obtained by adding TCB to the HFTCB solvent so that the concentration becomes 10% by mass, and using a stirrer with stirring blades (6 flat turbines) while stirring at a rotation speed of 70 rpm, A fluorine-containing gas diluted with nitrogen gas was supplied so that the fluorine gas concentration was 30% by volume, and fluorination of TCB was performed at a reaction temperature of 70°C.

[0085] The fluorine-containing gas was supplied into the reaction solution from the fluorine gas supply port provided in the reactor below the stirrer, and the supply rate of the fluorine-containing gas was 277 L / min (0° C., converted to 0 ...

Embodiment 2

[0096] Constant-current electrolysis was performed in the same manner as in Example 1, except that the B liquid of Example 1 was used as hydrogen fluoride replenished to the electrolytic cell. The constant current electrolysis was started, and 39g of liquid B was replenished every 100 hours. During the 1000 hours of constant current electrolysis, a total of 390g of hydrogen fluoride was added, but the cell voltage only rose to 7.2V, and the amount of fluorine gas produced remained unchanged.

Embodiment 3

[0101] As a fluorination reaction, fluorine gas is reacted with 1,1,2,2-tetrafluoroethane (hereinafter referred to as "TFE") as a raw material compound, and perfluoroethane (hereinafter referred to as "TFE") which is the main fluoride is synthesized by gas phase reaction. denoted as "PFE").

[0102] Fluorine gas and TFE were supplied to a cylindrical reactor with an inner diameter of 50 cm, a length of 8 m, and a capacity of 1570 L, and the temperature of the reactor was controlled to be 350° C., and the reaction was carried out at a reaction pressure of 0.2 MPaG (gauge pressure). In addition, fluorine gas is supplied after being diluted with PFE to a concentration of 4% by volume, and the supply amount of fluorine gas is 30Nm 3 . In addition, TFE is supplied after being diluted with PFE to a concentration of 2% by volume, and the supply amount of TFE is 15 Nm 3 .

[0103] In the separation process, the gas discharged from the outlet of the reactor is cooled to -45°C, the u...

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Abstract

Provided is a fluorine gas production method, which makes it possible to re-use a byproduct hydrogen fluoride, which is a byproduct produced during the production of a fluoride, i.e., a desired component, by reacting a raw material compound with a fluorine gas to fluorinate the raw material compound, as a raw material for the production of a fluorine gas by an electrolysis method. The fluorine gas production method comprises: a fluorination step of producing a reaction mixture comprising a main product fluoride, which is a desired component produced by fluorinating a raw material compound, and a byproduct hydrogen fluoride, which is produced as a byproduct; a separation step of separating the reaction mixture to produce a main product component containing the main product fluoride and a byproduct component containing the byproduct hydrogen fluoride; a purification step of purifying the byproduct component to produce such a recycled hydrogen fluoride component that the concentration of an organic substance contained in the byproduct component is decreased and the concentration of the byproduct hydrogen fluoride is increased; an electrolysis step of carrying out an electrolysis procedure using the recycled hydrogen fluoride component as at least a portion of an electrolyte solution to produce a fluorine gas; and an introduction step of introducing the fluorine gas produced in the electrolysis step into a reaction field for fluorination in the fluorination step.

Description

technical field [0001] The present invention relates to a method for producing fluorine gas. Background technique [0002] Fluorine (F 2 ) and fluorine-containing organic compounds are widely used in civilian fields from the fields of atomic energy industry, semiconductor industry, and medical pesticide products. Among them, fluorine gas is a highly reactive substance, so the reaction for producing fluorine gas has to be an endothermic reaction. Therefore, fluorine gas cannot be produced by methods other than electrolysis, which easily causes an endothermic reaction, and almost all fluorine gas is produced by electrolysis. [0003] In addition, many fluorine-containing organic compounds are synthesized by direct fluorination reactions. In the direct fluorination reaction, by reacting fluorine gas with an organic compound, the hydrogen atoms in the organic compound are replaced by fluorine atoms to generate a fluorine-containing organic compound, and at the same time, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/245C01B9/08B01D3/00B01D53/14B01D15/08B01D53/00B01J20/20B01J20/08
CPCC25B1/245C01B9/08B01D3/00B01D53/1456B01D53/1418B01D15/08B01D53/002B01J20/20B01J20/08C01B7/20B01D2256/26B01D2257/2066B01D2257/2047B01D53/04B01D2253/102B01D2253/104C25B15/081C25B11/043C01B7/191C25B15/085C01B7/19C25B1/24
Inventor 藤村孝贵小林浩福地阳介
Owner RESONAC CORPORATION
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