Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride
US3976447A · kind A · utility
26Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1975 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Mar 11, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A gaseous mixture containing up to 20% of hydrogen fluoride and other gases inert to alkaline earth metal fluorides is passed in contact with particulate anhydrous alkaline earth metal fluoride prepared by the fluorination of anhydrous alkaline earth metal chloride in the absence of water. After the anhydrous alkaline earth metal fluoride has taken up the desired amount of hydrogen fluoride, up to its absorption capacity, the hydrogen fluoride is removed therefrom, e.g. by heat regeneration, and the alkaline earth metal fluoride is reused to absorb additional hydrogen fluoride from said gaseous mixtures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.