Patents by Inventor Shouji Hamada

Shouji Hamada 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 producing phenol and methyl ethyl ketone
    Patent number: 5304684
    Abstract: sec-Butylbenzene hydroperoxide obtained by oxidizing sec-butylbenzene is decomposed into phenol and methyl ethyl ketone, a resulting liquid comprising a methyl ethyl ketone as the main component is washed with an aqueous alkali solution to remove carboxylic acids, carboxylic acid esters, unsaturated ketones, and aldehydes, and the washed liquid is further subjected to neutralization, dehydration, and distillation.A methyl ethyl ketone can be obtained which has a high quality with regard to purity and potassium permanganate fading.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: April 19, 1994
    Assignee: Sumitomo Chemical Company, Ltd.
    Inventors: Hiroshi Nishida, Kazuo Kimura, Shouji Hamada, Masaaki Toma, Hirooki Nagaoka