Filtration and purification method for aqueous acids
US6649064B2 · kind B2 · utility
6Cited by
30References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2002 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Jan 28, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention pertains to a method for removing metallic ions and/or particulate material from an aqueous acid solution using particle removing membranes (e.g., ultra high molecular weight polyethylene) having immobilized ligand groups (e.g., macrocycle or other similar chelating ligands) that possess high equilibrium binding constants for ion and particulate removal. The method is particularly useful for simultaneously filtering/purifying aqueous hydrofluoric or hydrochloric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.