Patents by Inventor Nobumasa Shimomura

Nobumasa Shimomura 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).

  • Process for preparing purified conjugated diene
    Patent number: 6395953
    Abstract: Processes for producing a purified conjugated diene comprise feeding a petroleum fraction containing the conjugated diene to an extractive distillation column, feeding an extraction solvent to the extractive distillation column, and extractive-distilling the conjugated diene from the petroleum fraction containing the conjugated diene in the extractive distillation column. The extraction solvent comprises an amide compound, and a heterocyclic aldehyde, aromatic nitro compound or aromatic aldehyde is contained in the extraction solvent within a range of 0.01 to 10 wt. % based on the weight of the extractive solvent. An oxygen concentration in a gas phase of a distillate discharged from the top of the extraction distillation column is controlled to 10 ppm or lower.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: May 28, 2002
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Takaki Koga, Nobumasa Shimomura, Masanobu Kanauchi
  • PROCESS FOR PREPARING PURIFIED CONJUGATED DIENE
    Publication number: 20020052533
    Abstract: A process for producing a purified conjugated diene, comprising a step of isolating a conjugated diene from a petroleum fraction containing the conjugated diene by extractive distillation, the step comprising:
    Type: Application
    Filed: August 24, 1999
    Publication date: May 2, 2002
    Inventors: TAKAKI KOGA, NOBUMASA SHIMOMURA, MASANOBU KANAUCHI