Patents by Inventor Tetsuji Harigai

Tetsuji Harigai 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 AND SYSTEM FOR PURIFICATION OF TETRAHYDROFURAN
    Publication number: 20120215012
    Abstract: A method for purifying tetrahydrofuran from a liquid containing tetrahydrofuran and as impurities at least water, 2,5-dihydrofuran and butanol, the method comprising: a first distillation step in which the liquid is subjected to distillation using a distillation column to separate into a first bottoms product containing water as a major component and a first distillate containing tetrahydrofuran, 2,5-dihydrofuran and butanol as major components, a second distillation step in which the first distillate is subjected to distillation using a distillation column to separate into a second bottoms product containing tetrahydrofuran and butanol as major components and a second distillate containing 2,5-dihydrofuran as a major component, a third distillation step in which the second bottoms product is subjected to distillation using a distillation column to separate into a third bottoms product containing butanol as a major component and a third distillate containing tetrahydrofuran as a major component, and further c
    Type: Application
    Filed: October 30, 2009
    Publication date: August 23, 2012
    Inventors: Toshiaki Matsuo, Kenichiro Oka, Masayuki Kamikawa, Takeyuki Kondo, Hiroyuki Ito, Yasunari Sase, Chiaki Watanabe, Tetsuji Harigai