公开(公告)号：US12152308B2

公开(公告)日：2024-11-26

申请号：US17613865

申请日：2020-12-11

Applicant: SHOWA DENKO K.K.

Inventor： Katsumi Mikami ,  Yohsuke Fukuchi ,  Hiroshi Kobayashi

IPC: C25B15/023 ,  C25B1/245 ,  C25B9/17 ,  C25B11/043 ,  C25B15/08

Abstract: 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.

公开(公告)号：US11427907B2

公开(公告)日：2022-08-30

申请号：US16318645

申请日：2017-07-11

Applicant: SHOWA DENKO K.K.

Inventor： Takanori Aoki ,  Katsumi Mikami

IPC: F17C9/02 ,  C23C16/448 ,  F17C9/00

Abstract: Provided is a gas supply apparatus for supplying a gas compound obtained by vaporizing a liquid compound to a target location, the gas supply apparatus comprising: a storage vessel capable of storing the liquid compound; a gas compound supply pipeline, one end of which is connected to the storage vessel, and another end of which is capable of being disposed at the target location; and a temperature control device configured to adjust a temperature of the gas compound or the liquid compound within the storage vessel to be equal to or lower than a surrounding temperature of the gas compound supply pipeline.

公开(公告)号：US20220251703A1

公开(公告)日：2022-08-11

申请号：US17725655

申请日：2022-04-21

Applicant: SHOWA DENKO K.K.

Inventor： Takanori AOKI ,  Katsumi Mikami

IPC: C23C16/448 ,  F17C9/02 ,  F17C9/00

Abstract: A gas supply method for supplying a gas compound obtained by vaporizing a liquid compound stored in a storage vessel to a target location through a gas compound supply pipeline, the gas supply method including adjusting a temperature of the liquid compound or the gas compound within the storage vessel to be equal to or lower than a surrounding temperature of the gas compound supply pipeline.

公开(公告)号：US12163235B2

公开(公告)日：2024-12-10

申请号：US17614801

申请日：2020-12-03

Applicant: SHOWA DENKO K.K.

Inventor： Katsumi Mikami ,  Yohsuke Fukuchi ,  Hiroshi Kobayashi

IPC: C25B1/245 ,  C25B9/00 ,  C25B9/09 ,  C25B15/023 ,  C25B15/08 ,  G01N15/02 ,  G01N15/0205

Abstract: 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.

公开(公告)号：US12098468B2

公开(公告)日：2024-09-24

申请号：US17595713

申请日：2020-12-11

Applicant: SHOWA DENKO K.K.

Inventor： Katsumi Mikami ,  Yohsuke Fukuchi ,  Hiroshi Kobayashi

IPC: C25B1/24 ,  C25B1/245 ,  C25B11/043 ,  C25B15/023

CPC classification number: C25B1/245 ,  C25B11/043 ,  C25B15/023

Abstract: 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.

公开(公告)号：US12252458B2

公开(公告)日：2025-03-18

申请号：US17614153

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Naoyuki Tanaka ,  Katsumi Mikami ,  Takamitsu Kobayashi

IPC: C07C231/12 ,  C07C231/24

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer comprising 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in the step (A) in a mixed solvent of ethyl acetate and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product (step (B)), wherein a mass ratio of ethyl acetate/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US11168043B2

公开(公告)日：2021-11-09

申请号：US16981814

申请日：2019-03-01

Applicant: SHOWA DENKO K.K.

Inventor： Katsumi Mikami ,  Yohsuke Fukuchi ,  Shinya Oguro ,  Hiroshi Kobayashi

IPC: C07C17/013 ,  C07C17/04 ,  C07C19/01 ,  B01J19/26 ,  B01J4/00 ,  B01J19/24 ,  B01J10/00

Abstract: 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 (1) containing 3,4-dichloro-1-butene is placed in a reaction container (11), then chlorine gas is supplied to a gas phase (2) in the reaction container (11), and the 3,4-dichloro-1-butene is reacted with the chlorine gas to give 1,2,3,4-tetrachlorobutane.

公开(公告)号：US10995046B2

公开(公告)日：2021-05-04

申请号：US16760091

申请日：2018-10-11

Applicant: SHOWA DENKO K.K.

Inventor： Katsumi Mikami ,  Nozomi Kusumoto ,  Shinya Oguro ,  Yohsuke Fukuchi

IPC: C07C17/04

Abstract: 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 (1) containing 3,4-dichloro-1-butene is charged in a reaction vessel (11) having an inner surface, to be brought into contact with the reactant solution (1), made of a metal and a chlorine gas is introduced into the reactant solution (1) 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 (1) from the reaction vessel (11), filtering the reactant solution (1) thus taken out to remove a solid matter, and returning the filtered reactant solution (1) into the reaction vessel (11).