Process for removal of hydrogen fluoride
US6676809B1 · kind B1 · utility
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15References
4Claims
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Key dates
| Filing date | Nov 12, 1997 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Nov 12, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C19/10
- WIPO fieldOrganic fine chemistry
- 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.