Method for separating hexafluoropropylene oxide from hexafluoropropylene
US8877017B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2010 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Aug 15, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D303/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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 CnHaFb (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.