Method for the manufacture of concentrated phosphorus acid
US8728427B2 · kind B2 · utility
1Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2009 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Oct 22, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/163
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the manufacture of concentrated phosphorous acid starting from pure P4O6 is disclosed. The P4O6 is hydrolyzed, preferably under stirring in water in the presence of a homogeneous Broensted acid catalyst while maintaining in the hydrolysis/reaction medium a pH below 5 whereby the free water level, at the completion of the hydrolysis, is in the range from 0 to 40%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.