Scale control in phosphoric acid manufacture
US5120519A · kind A · utility
11Cited by
1References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Nov 4, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/223
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High molecular weight copolymers of acrylamide which contain between 5-100 mole % of acrylic acid and have a molecular weight of at least 1,000,000 prevent scale adhering to surfaces in contact with digested phosphate rock and/or phosphoric acid produced from digestion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.