Showa Denko K.k.

Resonac Corporation

Yohsuke Fukuchi

Hiroshi Kobayashi

Katsumi Mikami

Shinya Oguro

Tomokazu Sugawara

Nozomi Inoue

Nozomi Kusumoto

Hiroshi Ikeda

Shinichi Yorozuya

Mitsuhiro Hino

Tomoki Sekiguchi

Koki Fujimura

There is provided an anode for electrolytic synthesis capable of electrolytically synthesizing fluorine gas or a fluorine containing compound by a simple process and at a low cost while suppressing the occurrence of an anode effect. An anode for electrolytic synthesis () for electrolytically synthesizing fluorine gas or a fluorine containing compound includes an anode substrate formed of a carbonaceous material and a metal coating film coating the anode substrate. Metal constituting the metal coating film is nickel.

Anode for electrolytic synthesis and method for producing fluorine gas or fluorine containing compound

A method for producing fluorine gas including a fluorination step of obtaining a reaction mixture containing a major fluorinated substance that is a target component generated by fluorination of a raw material compound and by-product hydrogen fluoride, a separation step of separating the reaction mixture to obtain a main product component containing the major fluorinated substance and a by-product component containing the by-product hydrogen fluoride, a purification step of purifying the by-product component to obtain a recovered hydrogen fluoride component in which a concentration of an organic substance is reduced and a concentration of the by-product hydrogen fluoride is increased, an electrolysis step of performing electrolysis using the recovered hydrogen fluoride component as at least a part of an electrolyte to produce fluorine gas, and an introduction step of introducing the fluorine gas obtained in the electrolysis step into a reaction field for fluorination in the fluorination step.

Method for producing fluorine gas

A fluorine gas production device includes an electrolytic cell, a partition wall extending downward in the vertical direction from the ceiling surface inside the electrolytic cell to partition the electrolytic cell into an anode chamber and a cathode chamber, an anode, and a cathode. The lower end of the partition wall is immersed in the electrolytic solution and a length in the vertical direction of a portion immersed in the electrolytic solution of the partition wall is from 10% to 30% of the distance from the bottom surface inside the electrolytic cell to the liquid level of the electrolytic solution. The cathode is completely immersed in the electrolytic solution and the upper end of the cathode is arranged at a lower position in the vertical direction relative to the lower end of the partition wall. The anode is partially exposed from the liquid level of the electrolytic solution.

Fluorine gas production device

A device for producing fluorine gas has a first flow path configured to send a fluid from the inside of an electrolytic cell through a mist removal unit configured to remove mist from the fluid to a fluorine gas selection unit and a second flow path configured to send the fluid from the inside of the electrolytic cell to the fluorine gas selection unit without passing through the mist removal unit and has a flow path switching unit configured to switch a flow path through which the fluid flows depending on the average particle size of the mist measured by an average particle size measurement unit. The second flow path has a clogging suppression mechanism configured to suppress clogging of the second flow path by the mist.

Device for producing fluorine gas and light scattering detector

A method for producing fluorine gas including electrolyzing an electrolyte in an electrolytic cell, measuring the average particle size of a mist contained in a fluid generated in the inside of the electrolytic cell in the electrolyzing the electrolyte, and sending the fluid from the inside to the outside of the electrolytic cell through a flow path. The flow path in which the fluid flows is switched in accordance with the average particle size of the mist measured in the measuring the average particle size, such that the fluid is sent to a first flow path when the average particle size of the mist measured in the measuring the average particle size is not more than a predetermined reference value, or the fluid is sent to a second flow path when the average particle size is more than the predetermined reference value.

Method for producing fluorine gas and device for producing fluorine gas

A method for producing fluorine gas including electrolyzing an electrolyte in an electrolytic cell, measuring an intensity of sound generated near an anode in an inside of the electrolytic cell as the electrolyte is electrolyzed in the electrolyzing, and sending a fluid generated in the inside of the electrolytic cell in the electrolyzing the electrolyte, from the inside to the outside of the electrolytic cell through a flow path. The flow path is switched in accordance with the intensity of sound measured, such that the fluid is sent to a first flow path when the intensity of sound measured in the measuring an intensity of sound is not more than a predetermined reference value, or the fluid is sent to a second flow path when the intensity of sound measured in the measuring an intensity of sound is more than the predetermined reference value.

An anode mounting member () of a fluorine electrolytic cell including: a plurality of stacked annular packings surrounding a sidewall of a cylindrical anode packing gland (); a cylindrical exterior member () surrounding an outer periphery of the packings; and an annular fastening member () that fastens the plurality of packings and the exterior member () to the anode packing gland (), wherein among the packings a first ceramic packing () is located at an end of the longitudinal direction on an electrolyte tank side, and a second resin packing () is adjacent to the first packing (), central axes of the anode packing gland () and the exterior member () coincide, an inner diameter () is 0.2 mm to 1.0 mm larger than an outer diameter (R), and an outer diameter (R) is 0.2 mm to 1.0 mm smaller than an inner diameter ().

Anode mounting member of fluorine electrolytic cell, fluorine electrolytic cell, and method for producing fluorine gas

Provided is a method for producing tetrafluoromethane, and the method is unlikely to damage a reaction apparatus and can produce tetrafluoromethane safely, inexpensively, and stably. To a raw material liquid () containing a reaction inducer and a fluorinated hydrocarbon represented by chemical formula CHClF(in the chemical formula, p is an integer of 3 or more and 18 or less, q is an integer of 0 or more and 3 or less, r is an integer of 0 or more and 9 or less, and s is an integer of 5 or more and 30 or less) and having no carbon-carbon unsaturated bond, fluorine gas is introduced to give tetrafluoromethane. The reaction inducer is a hydrocarbon polymer solid at normal temperature and pressure and is reacted with fluorine gas to induce a reaction of forming tetrafluoromethane from the fluorinated hydrocarbon and the fluorine gas.

Method for producing tetrafluoromethane

Provided is a method for producing a fluorine-containing organic compound. The method can immediately detect the occurrence of a side reaction in direct fluorination reaction using fluorine gas and can give a highly pure fluorine-containing organic compound at a high yield. A raw material liquid () containing a raw material organic compound having a hydrogen atom and two or more carbon atoms is reacted with fluorine gas in a reaction container () to replace the hydrogen atom of the raw material organic compound with a fluorine atom to give a fluorine-containing organic compound. In the reaction, tetrafluoromethane contained in a gas phase () in the reaction container () is continuously measured, and the amount of the fluorine gas supplied to the reaction container () is controlled depending on the measured value of the tetrafluoromethane.

Method and apparatus for producing fluorine-containing organic compound

Provided is a method that is for producing hexafluoro-1,3-butadiene, discharges small amounts of industrial wastes, and is industrially applicable. The method for producing hexafluoro-1,3-butadiene includes a reaction step of reacting a halogenated butane represented by chemical formula, CFX-CFX-CFX-CFX(X, X, X, and Xare each independently a halogen atom other than a fluorine atom) in an organic solvent in the presence of zinc to eliminate the halogen atoms, X, X, X, and X, other than the fluorine atoms to generate hexafluoro-1,3-butadiene, giving a reaction product containing the hexafluoro-1,3-butadiene, and an aftertreatment step of separating the hexafluoro-1,3-butadiene from the reaction product produced in the reaction step, then adding water to a reaction product residue after the separating, and removing the organic solvent, giving an aqueous solution of zinc halide.

Production method for hexafluoro-1,3-butadiene

Provided are a method and an apparatus for producing 1,2,3,4-tetrachlorobutane that are unlikely to lose 3,4-dichloro-1-butene as the material or 1,2,3,4-tetrachlorobutane as the product and can be stably and economically produce 1,2,3,4-tetrachlorobutane. A reaction liquid () containing 3,4-dichloro-1-butene is placed in a reaction container (), then chlorine gas is supplied to a gas phase () in the reaction container (), and the 3,4-dichloro-1-butene is reacted with the chlorine gas to give 1,2,3,4-tetrachlorobutane.

Method and apparatus for producing 1,2,3,4-tetrachlorobutane

Provided is a method for producing hexafluoro-1,3-butadiene, and the method can produce hexafluoro-1,3-butadiene at an industrially sufficient level of yield. In a reaction liquid containing a halogenated butane represented by chemical formula, CFX&#x2014;CFX&#x2014;CFX&#x2014;CFX(X, X, X, and Xare each independently a halogen atom other than a fluorine atom), zinc, and an organic solvent, a reaction is conducted to eliminate the halogen atoms other than a fluorine atom, X, X, X, and X, from the halogenated butane, yielding hexafluoro-1,3-butadiene. During the reaction, the concentration of a zinc halide generated by the reaction, in the reaction liquid is not more than the solubility of the zinc halide in the organic solvent.

Method for producing hexafluoro-1,3-butadiene

Fluorine gas is introduced to a raw material liquid containing a reaction inducer and a fluorinated hydrocarbon represented by CHClF(in the formula, p is an integer of 3 to 18, q is an integer of 0 to 3, r is an integer of 0 to 9, and s is an integer of 5 to 30) and having no carbon-carbon unsaturated bond to give tetrafluoromethane. The reaction inducer is a halogen-containing carbon compound liquid at room temperature and pressure and is reacted with fluorine gas to induce a reaction of forming tetrafluoromethane from the fluorinated hydrocarbon and the fluorine gas. The reaction inducer is contained at a content of more than 0% by mass and not more than 10% by mass when the total content of the fluorinated hydrocarbon and the reaction inducer contained in the raw material liquid is 100% by mass.

A method for producing tetrafluoromethane as follows is unlikely to damage a reaction apparatus and can produce tetrafluoromethane safely, inexpensively, and stably. To a raw material liquid containing a fluorinated hydrocarbon represented by chemical formula CHClF(wherein p is an integer of 3 to 18, q is an integer of 0 to 3, r is an integer of 0 to 9, and s is an integer of 5 to 30) and having no carbon-carbon unsaturated bond, fluorine gas is introduced, and concurrently a reaction inducer is introduced in a gas state, giving tetrafluoromethane. The reaction inducer is reacted with fluorine gas to induce a reaction of forming tetrafluoromethane from the fluorinated hydrocarbon and the fluorine gas and is at least one reaction inducer selected from a hydrocarbon gaseous at normal temperature and pressure and hydrogen gas.

There is provided a method of producing 1,2,3,4-tetrachlorobutane capable of stably and economically producing 1,2,3,4-tetrachlorobutane. A reactant solution () containing 3,4-dichloro-1-butene is charged in a reaction vessel () having an inner surface, to be brought into contact with the reactant solution (), made of a metal and a chlorine gas is introduced into the reactant solution () to perform a reaction between 3,4-dichloro-1-butene and the chlorine gas to produce 1,2,3,4-tetrachlorobutane. The reaction is performed while carrying out an operation of taking out at least a portion of the reactant solution () from the reaction vessel (), filtering the reactant solution () thus taken out to remove a solid matter, and returning the filtered reactant solution () into the reaction vessel ().

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Tokyo, Japan

Yohsuke Fukuchi