Patents by Inventor Shoichi Motokawa

Shoichi Motokawa 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).

  • Apparatus for the thermal cracking of heavy hydrocarbon
    Patent number: 4147753
    Abstract: In a process for the thermal cracking of a heavy hydrocarbon in a cylindrical reactor, a portion of the content material in the reactor is taken out and injected back into the reactor according to a specific procedure to form a "wet wall" or liquid curtain on the inner peripheral wall of the reactor, thereby preventing coking in the reactor. The apparatus includes a radially outwardly extending interior annular recess around an upper portion of the inner wall thereof and forming a part of said inner wall and plural means for tangentially injecting the recycled liquid into said recess.
    Type: Grant
    Filed: November 11, 1977
    Date of Patent: April 3, 1979
    Assignees: Kureha Kagaku Kogyo Kabushiki Kaisha, Chiyoda Chemical Engineering & Construction Co., Ltd.
    Inventors: Tomizo Endo, Yutaka Sumida, Toru Kawahara, Masaichi Ohtake, Shoichi Motokawa, Keiji Nagayama, Masatomo Shigeta, Hiroshi Hozuma, Masaharu Tomizawa, Hideo Kikuchi
  • Method for the thermal cracking of heavy hydrocarbon
    Patent number: 4085034
    Abstract: In a process for the thermal cracking of a heavy hydrocarbon in a cylindrical reactor, a portion of the content material in the reactor is taken out and injected back into the reactor according to a specific procedure to form a "wet wall" or liquid curtain on the inner peripheral wall of the reactor, thereby preventing coking in the reactor.
    Type: Grant
    Filed: October 14, 1976
    Date of Patent: April 18, 1978
    Assignees: Kureha Kagaku Kogyo Kabushiki Kaisha, Chiyoda Chemical Engineering & Construction Co., Ltd.
    Inventors: Tomizo Endo, Yutaka Sumida, Toru Kawahara, Masaichi Ohtake, Shoichi Motokawa, Keiji Nagayama, Masatomo Shigeta, Hiroshi Hozuma, Masaharu Tomizawa, Hideo Kikuchi
  • Apparatus and method for removing pitch from thermally cracked gas
    Patent number: 4050910
    Abstract: A demister is disclosed containing a plurality of bubble-cap trays and a plurality of sieve trays beneath the bubble-cap trays and arranged so that the distance between the uppermost sieve tray and the bottom surface of the lower-most bubble-cap tray is at least twice the distance between adjoining sieve trays. A spray nozzle for washing the bottom surface of the lowermost sieve tray with a cleaning oil is also provided.
    Type: Grant
    Filed: October 14, 1976
    Date of Patent: September 27, 1977
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takao Ishihara, Kiyoji Sanpei, Hiroshi Nabatame, Shoichi Motokawa