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:
Nov. 04, 2014
Filed:
Feb. 18, 2010
Hideki Nakaya, Osaka, JP;
Kazuyoshi Ichihara, Osaka, JP;
Yasuhide Senba, Osaka, JP;
Mikio Nakagoshi, Osaka, JP;
Kazunori Morimoto, Osaka, JP;
Hideki Nakaya, Osaka, JP;
Kazuyoshi Ichihara, Osaka, JP;
Yasuhide Senba, Osaka, JP;
Mikio Nakagoshi, Osaka, JP;
Kazunori Morimoto, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CHF(wherein n, a and b are integers which satisfy: n=3 to 8, 0≦a≦2n+1, and 1≦b≦2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.