Process for removal of hydrogen fluoride
US6311515A · kind A · utility
0Cited by
14References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2000 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Jun 14, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B7/195
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Hydrogen fluoride is effectively removed from a mixture of hydrogen fluoride, dichloromethane, chlorofluoromethane and/or difluoromethane by distilling the mixture so that two-component azeotropic mixtures of hydrogen fluoride and dichloromethane, hydrogen fluoride and chlorofluoromethane and hydrogen fluoride and difluoromethane are removed, or by liquid-separating the mixture into an upper liquid phase rich in hydrogen fluoride and a lower liquid phase not rich in hydrogen fluoride before each liquid phase is distilled as described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.