Patents by Inventor Mutsumi Samejima

Mutsumi Samejima 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 the recovery of acetic acid
    Patent number: 4883912
    Abstract: In a process for the recovery of acetic acid by extracting acetic acid from an aqueous acetic acid solution containing a metallic salt of sulfuric acid with an organic extractant comprising a tertiary amine and an organic diluent and recovering acetic acid from the liquid extract, a mixture of a tertiary amine containing sulfuric acid and an organic diluent is used as an organic extractant so as to suppress energy consumption and to increase extraction efficiency.
    Type: Grant
    Filed: May 14, 1986
    Date of Patent: November 28, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Kunio Koga, Koji Shima, Mutsumi Samejima
  • Method of operating mixer-settler
    Patent number: 4562288
    Abstract: In extracting object material from its aqueous solution by using an organic solvent, a mixer-settler extractor is employed as the extractor and operated while a solvent dispersion is maintained in the mixer, and part of the aqueous phase discharged from the settler is recycled to the mixer so that the organic solvent phase in the mixer is stably maintained as the disperse phase.
    Type: Grant
    Filed: January 10, 1984
    Date of Patent: December 31, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Kunio Koga, Yukihiro Sasaki, Mutsumi Samejima