Purified 1,1,1,3,3,3-hexafluoropropane and method for making same
US6274779A · kind A · utility
Inventors
Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/395
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A 1,1,1,3,3,3-hexafluoropropane product of greater than about 99.9 weight percent purity containing less than about 100 parts per million unsaturated fluorocarbons and a method for its purification from a distillation mixture of 1,1,1,3,3,3-hexafluoropropane with at least one unsaturated fluorocarbon which method includes the steps of: PA1 a) reacting the mixture with chlorine to saturate the unsaturated fluorocarbons, PA1 b) washing the reacted mixture with an aqueous solution to remove residual hydrochloric acid and chlorine, PA1 c) removing the aqueous solution, and PA1 d) distilling the reacted mixture to obtain a 1,1,1,3,3,3-hexafluoropropane product of greater than about 99.9 weight percent purity containing less than about 100 parts per million unsaturated fluorocarbons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.