Purification of organic fluorine compounds
US5874658A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1997 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Sep 12, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for separating a mixture of at least one hydrofluorocarbon from hydrogen fluoride. The method comprising treating said mixture with a compound selected from the group consisting of an alkanolamine of formula EQU NH.sub.a (CH.sub.b R.sub.c).sub.d where R is C.sub.1 to C.sub.6 linear or branched alkylene substituted with at least one hydroxy group, wherein a and d are the integers 1 or 2 and a+d=3 and b is 0 or the integer 1 or 2 and b+c=3, C.sub.6 to C.sub.10 aryl unsubstituted or substituted with halo or halo-substituted C.sub.1 to C.sub.6, alkyl, sulfuric acid and sulfuric acid admixed with at least one alkali metal sulfate. The hydrofluorocabon and HF form two separate phases by this treatment. The phases are readily separated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.