Azeotropic or azeotrope-like compositions of tetrafluoroethane and chlorotetrafluoroethane
US5723429A · kind A · utility
5Cited by
23References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Apr 24, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C19/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The disclosure relates to separating 1,1,2,2 tetrafluoroethane (HFC-134) and 1,1,1,2 tetrafluoroethane (HFC-134a) from each other and/or from fluorocarbon impurities by using extractive distillation with an extractive agent comprising an alcohol. Examples of suitable extractive agents comprise at least one member from the group of methanol, butanol, ethanol, propanol, their isomers and cyclic compounds thereof, among others.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.