The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 1994
Filed:
Jul. 07, 1993
Applicant:
Inventors:
Hiroshi Nishida, Ichihara, JP;
Kazuo Kimura, Ichihara, JP;
Shouji Hamada, Misawa, JP;
Masaaki Toma, Ichihara, JP;
Hirooki Nagaoka, Minoo, JP;
Assignee:
Sumitomo Chemical Company, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568385 ; 568410 ; 568754 ; 568798 ;
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.