High absorbtivity sodium tripolyphosphate
US4790983A · kind A · utility
3Cited by
4References
3Claims
0Family size
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Key dates
| Filing date | Apr 24, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Apr 24, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/41
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High absorbtivity sodium tripolyphosphate is prepared by moisturizing the anhydrous orthophosphate particles produced by spray-drying an aqueous solution of sodium phosphates during the production of sodium tripolyphosphate. Following moisturization, the hydrated particles are calcined at a temperature within the range of from about 300.degree. C. to about 600.degree. C. to produce a granular sodium tripolyphosphate product having an absorbtivity value of at least about 30%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.