Removal of phosphine from phosphine-contaminated carbon monoxide gas streams
US4175111A · kind A · utility
4Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1977 |
| Grant date | Nov 20, 1979 |
| Priority date | — |
| Expiry date | Dec 14, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B32/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Off gases from electric furnace production of phosphorus, consisting essentially of carbon monoxide and phosphine, are heated to 700.degree.-800.degree. C. to decompose the phosphine to red phosphorus and hydrogen; the red phosphorus is separated from the gas--most desirably by passing the gas through aqueous hydrogen peroxide which oxidizes the phosphorus to phosphoric acid,--to obtain a clean gas which can be used as a fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.