Patents by Inventor Keiji Maehara

Keiji Maehara 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).

  • Thermal cracking process and facility for heavy petroleum oil
    Patent number: 8277640
    Abstract: The present invention relates to a process for thermal cracking of heavy petroleum oil, in which when a thermal cracking facility having a cracking furnace, two or more of trains each comprising two reaction vessels and one distillation tower is operated, each train is operated by repeating a cycle comprising drawing the heavy petroleum oil from the cracking furnace, feeding the drawn heavy petroleum oil into the first reaction vessel and then feeding the drawn heavy petroleum oil into the second reaction vessel, steam is directly brought in contact with the heavy petroleum oil to be thermally cracked, and gaseous cracked substances produced and steam are introduced into the distillation tower to be distilled and separated, wherein phase delay is provided for the cycle repeated in each train so that the thermal cracking facility is operated with the different initiation time of feeding to the first reaction vessel in each train.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: October 2, 2012
    Assignees: Chiyoda Corporation, Fuji Oil Co., Ltd.
    Inventors: Atsushi Tamagawa, Makoto Nomura, Isao Shibutani, Keiji Maehara, Hisao Takeuchi
  • THERMAL CRACKING PROCESS AND FACILITY FOR HEAVY PETROLEUM OIL
    Publication number: 20100018897
    Abstract: The present invention relates to a process for thermal cracking of heavy petroleum oil, in which when a thermal cracking facility having a cracking furnace, two or more of trains each comprising two reaction vessels and one distillation tower is operated, each train is operated by repeating a cycle comprising drawing the heavy petroleum oil from the cracking furnace, feeding the drawn heavy petroleum oil into the first reaction vessel and then feeding the drawn heavy petroleum oil into the second reaction vessel, steam is directly brought in contact with the heavy petroleum oil to be thermally cracked, and gaseous cracked substances produced and steam are introduced into the distillation tower to be distilled and separated, wherein phase delay is provided for the cycle repeated in each train so that the thermal cracking facility is operated with the different initiation time of feeding to the first reaction vessel in each train.
    Type: Application
    Filed: August 29, 2007
    Publication date: January 28, 2010
    Applicant: Chiyoda Corporation
    Inventors: Atsushi Tamagawa, Makoto Nomura, Isao Shibutani, Keiji Maehara, Hisao Takeuchi
  • Process for the production of bisphenol A
    Patent number: 6512148
    Abstract: A process for the production of bisphenol A, including providing a melt of a crystalline adduct of bisphenol A and phenol, contacting the melt with a cation donating solid to neutralize the strong acid therewith, and then heating the melt to vaporize and remove phenol from the melt.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: January 28, 2003
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Susumu Yamamoto, Atsumi Kukidome, Makoto Nomura, Keiji Maehara, Kenji Nagahama