Phosphorous pentoxide producing methods
US7910080B2 · kind B2 · utility
9Cited by
34References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2008 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | May 27, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05B17/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of from 0.5 to 1.0 and maintaining a bed temperature at or above 1260° C. along a portion of the bed length without exceeding 1380° C. along the entire bed length. Less than 10% of the agglomerates' phosphate input to the kiln remains in the kiln residue as phosphate. Another method includes maintaining a bed temperature at or above 1180° C. along a portion of the bed length and establishing a bed surface-to-volume ratio multiplied by a time for bed heat up to 1180° C. of less than 50 minutes-ft2/ft3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.