Process for producing ammonium polyphosphate
US4637921A · kind A · utility
5Cited by
5References
3Claims
0Family size
Inventors
Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/405
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved process of concentrating wet process phosphoric acid by continuously contacting an acid feed containing at least about 56 weight percent of P.sub.2 O.sub.5 based on the total weight of the feed with heated gases consisting of air and gaseous fuel combustion products thereby forming a mixture of said gases containing entrained superphosphoric acid particles, continuously coalescing said mixture in a coalescence zone forming coalesced superphosphoric acid and continuously removing the coalesced superphosphoric acid from said coalescence zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.