Patents by Inventor Keiji Mitarai

Keiji Mitarai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for treating an amine-containing waste water
    Patent number: 5039424
    Abstract: A method for treating an amine-containing waste water, which comprises conducting the waste water to active carbon.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: August 13, 1991
    Assignee: Tosoh Corporation
    Inventors: Keiji Mitarai, Masahiko Fujii, Ieyoshi Inoue, Sadakatsu Kumoi
  • Process for producing polyethylenepolyamine
    Patent number: 4980507
    Abstract: A process for producing polyethylenepolyamine from ethylene dichloride and aqueous ammonia which comprises reacting ethylene dichloride with ammonia, and then continuing the reaction in the presence of at least one kind of amine when the overall conversion of ethylene dichloride has become 25 to 85%.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: December 25, 1990
    Assignee: Tosoh Corporation
    Inventors: Norimasa Mizui, Keiji Mitarai, Yukihiro Tsutsumi
  • Process for producing polyamines
    Patent number: 4845297
    Abstract: Process for producing polyamines by a catalytic reduction reaction of a cyanoethylated N-(2-aminoethyl)piperazine and cyanoethylated compounds of polyamines containing 4 or more amino groups in the molecule.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: July 4, 1989
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Sadakatsu Kumoi, Keiji Mitarai, Yukihiro Tsutsumi
  • Process for the manufacture of ethanol
    Patent number: 4758600
    Abstract: Ethanol is prepared with high selectivity by the catalytic reaction of carbon monoxide and hydrogen.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: July 19, 1988
    Assignee: Agency of Industrial Science and Technology
    Inventors: Satoshi Arimitsu, Katsumi Yanagi, Hitomi Hosono, Toshihiro Saito, Kazuaki Tanaka, Yuji Onda, Kazuo Takada, Keiji Mitarai, Nobuyuki Taniguchi, Yoshimitsu Ishii, Takakazu Fukushima
  • Method for producing bis [.beta.(N,N-dimethylamino)ethyl]ether
    Patent number: 4625064
    Abstract: An improved process for preparing a bis [.beta.-(N,N-dimethylamino)ethyl]ether by reacting a bismethohalide of bis [.beta.-(N,N-dimethylamino)ethyl]ether represented by the following general formula: ##STR1## (wherein X denotes a halogen atom), with an aliphatic amine having a boiling point of not lower than 220.degree. C. at atmospheric pressure and having a primary amino group in the molecule thereof. The process comprises the following two steps (a) and (b): (a) a step of distilling out water at a temperature of not more than 130.degree. C. under reduced pressure from a mixture of said bismethohalide aqueous solution and said aliphatic amine to provide a concentration of said bismethohalide to water of not less than 85% by weight, and (b) a step of reacting said bismethohalide and amine in a solid-liquid phase at a temperature of not lower than 140.degree. C.
    Type: Grant
    Filed: April 6, 1984
    Date of Patent: November 25, 1986
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Sadakatsu Kumoi, Keiji Mitarai, Yukihiro Tsutsumi
  • Method for producing bis[.beta.-(N,N-dimethylamino)alkyl]-ether
    Patent number: 4492803
    Abstract: A method for preparing a bis[.beta.-(N,N-dimethylamino)alkyl]ether by reacting a bismethohalide of bis[.beta.-(N,N-dimethylamino)alkyl]ether represented by the following general formula ##STR1## (wherein R and R' denote alkyl groups having 2-3 carbon atoms, and X denotes halogen atom,) with the aliphatic amine having 40.degree.-170.degree. C. of boiling point at atmospheric pressure and having one or two primary amino group in a molecule thereof at an increased pressure.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: January 8, 1985
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Sadakatsu Kumoi, Keiji Mitarai, Yukihiro Tsutsumi
  • Process for producing chain structured corpuscular calcium carbonate
    Patent number: 4157379
    Abstract: Chain structured corpuscular calcium carbonate is produced by a carbonation of calcium hydroxide suspended in water in the presence of a chelating agent and a water soluble metal salt.
    Type: Grant
    Filed: November 30, 1977
    Date of Patent: June 5, 1979
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Junji Arika, Masaru Takitani, Keiji Mitarai, Kazuaki Yamamoto