公开(公告)号：US10774037B2

公开(公告)日：2020-09-15

申请号：US16320686

申请日：2017-07-25

Applicant: SHOWA DENKO K.K.

Inventor： Takanori Aoki ,  Akira Shibuya ,  Takamitsu Kobayashi ,  Hideo Miyata ,  Shinya Tsukamoto ,  Manabu Kuwajima ,  Motoki Murai

IPC: C07C227/18 ,  C07C323/58 ,  C07C229/08 ,  C07C319/12 ,  B01J23/745 ,  B01J23/10 ,  B01J31/00 ,  C07C319/20 ,  B01J23/06 ,  B01J21/06 ,  C07C231/02 ,  C07C233/04

Abstract: The present invention relates to a method for producing a specified α-amino acid, the method including allowing a specified α-amino acid amide and water to react with each other in the presence of a zirconium compound which contains zirconium and at least one metal element selected from the group consisting of lithium, nickel, copper, zinc, cesium, barium, hafnium, tantalum, cerium, and dysprosium.

公开(公告)号：US12240794B2

公开(公告)日：2025-03-04

申请号：US17417599

申请日：2019-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu Kobayashi ,  Naoyuki Tanaka

IPC: C07C231/12

Abstract: A composition for producing an N-vinylcarboxylic acid amide includes (A) an N-(1-alkoxyethyl)carboxylic acid amide and (B) a carboxylic acid amide other than the N-(1-alkoxyethyl)carboxylic acid amide and the N-vinylcarboxylic acid amide, and satisfies the following conditions: (1) the composition has a melting point of 0 to 30° C.; (2) a water content is 0 to 1.00% by mass in a total amount of the composition; (3) a content ratio of the component (A) to the component (B) is 4.0 to 20.0 in terms of a molar ratio; and (4) a 5% by mass aqueous solution of the composition has a pH of 4.0 to 8.0. A method for producing an N-vinylcarboxylic acid amide includes thermally decomposing or catalytically decomposing the composition for producing an N-vinylcarboxylic acid amide.

公开(公告)号：US12157715B2

公开(公告)日：2024-12-03

申请号：US17614143

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu Kobayashi ,  Naoyuki Tanaka

IPC: 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 including 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 step (A) in a mixed solvent of 1,2-dimethoxyethane 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 1,2-dimethoxyethane/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：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：US11718579B2

公开(公告)日：2023-08-08

申请号：US17595783

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu Kobayashi ,  Naoyuki Tanaka

IPC: C07C231/24 ,  C07C233/05

CPC classification number: C07C231/24 ,  C07C233/05 ,  C07C231/24 ,  C07C233/05

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 step (A) in a mixed solvent of acetonitrile 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 acetonitrile/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：US11319278B2

公开(公告)日：2022-05-03

申请号：US16317988

申请日：2017-07-11

Applicant: SHOWA DENKO K.K.

Inventor： Takanori Aoki ,  Akira Shibuya ,  Takamitsu Kobayashi ,  Hideo Miyata ,  Shinya Tsukamoto ,  Manabu Kuwajima ,  Motoki Murai

IPC: C07C227/26

Abstract: Provided is a method for producing glycine, in which on synthesizing glycine from glycinonitrile, glycine can be obtained in a higher yield than that in the conventional method. The present invention relates to a method for producing glycine, including allowing glycinonitrile and water to react with each other in the presence of a cerium compound, optionally adding ammonia thereto, to obtain glycine.