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:
Jun. 22, 1982
Filed:
May. 19, 1980
Applicant:
Inventors:
Hirokazu Hosaka, Ibaraki, JP;
Kenji Tanimoto, Ichihara, JP;
Kunihiko Tanaka, Toyonaka, JP;
Toshiharu Morita, Yao, JP;
Katsuyuki Shiota, Toyonaka, JP;
Yuji Ueda, Izumi, JP;
Seiichi Kai, Daito, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07C / ;
U.S. Cl.
CPC ...
203 34 ; 203 35 ; 203 37 ; 203 71 ; 568411 ;
Abstract
Acetone having a markedly low content of aldehydes is recovered from an aqueous rectification residue brought about by rectification of crude acetone carried out after one crude acetone having been alkali-treated or while an alkali or an aqueous solution thereof being added to the crude acetone, by mixing the aqueous rectification residue with an alkali, neutralizing the mixture to a pH of 4 to 9, and then subjecting the resulting mixture to distillation to obtain acetone as a distillate.