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:
Aug. 23, 2005
Filed:
Jul. 02, 2002
Tatsuya Ohtsuka, Settsu, JP;
Yoshihiro Yamamoto, Settsu, JP;
Tatsuya Ohtsuka, Settsu, JP;
Yoshihiro Yamamoto, Settsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a process for the preparation of hexafluoroacetone characterized by bringing hexafluoro-1,2-epoxypropane into contact with at least one catalyst selected from the group consisting of titanium oxide catalysts and fluorinated titanium oxide catalysts to isomerize hexafluoro-1,2-epoxypropane; and a process for the preparation of hexafluoroacetone hydrate characterized by absorbing the hexafluoroacetone prepared by the above process into water to produce crude hexafluoroacetone hydrate, neutralizing the crude hexafluoroacetone hydrate with an alkali, and distilling the resulting mixture. According to the invention, high-purity hexafluoroacetone can be obtained by isomerization of hexafluoro-1,2-epoxypropane with little formation of by-products, and substantially acid-free high-purity hexafluoroacetone hydrate can also be obtained.