Chemical method of ferric ion removal from acid solutions
US4790958A · kind A · utility
39Cited by
10References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 18, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | May 18, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/934
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Onium species of nitrogen, phosphorus or sulfur are useful to precipitate ferric ion, existing as tetrahaloferrate anion, from strong haloacid solutions. The precipitants are useful in the field of well acidizing, because tetrahaloferrate anion attacks polymeric and viscoelastic surfactant thickeners used to thicken haloacid solutions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.