Method of improving gypsum slurry filtration in the production of phosphoric acid
US5211928A · kind A · utility
5Cited by
6References
4Claims
0Family size
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Key dates
| Filing date | Oct 15, 1991 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Oct 15, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/225
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for improving gypsum slurry filtration in the production of wet process phosphoric acid wherein an effective amount of carboxylic-type polymer having a portion of sulfonic functionality is used as the filtration aid. Preferred polymers are high molecular weight polymers of acrylic acid and acrylamido methylpropyl sulfonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.