Particulate soild supports functionalized with EGTA ligands
US6551515B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Apr 19, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J45/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Compositions and methods for selectively binding specific metal ions, such as Ca2+and Cd2+, contained in a source solution are disclosed and described. This is accomplished by the use of a composition comprised of an EGTA ligand covalently bonded to a particulate solid supports through a hydrophilic spacer. The composition formula of the present invention is SS—A—X—L where SS is a particulate solid support such as silica or a polymeric bead, A is a covalent linkage mechanism, X is a hydrophilic spacer grouping, L is an EGTA ligand with the proviso that when SS is a particulate organic polymer, A—X may be combined as a single covalent linkage. The separation is accomplished by passing a source solution containing the ions to be separated through a column containing the particulate composition, causing the selected ions to be complexed to the EGTA ligand and subsequently removing the selected ions from the column or other separation device by passing an aqueous receiving solution through the separation device and quantitatively stripping the selected ions from the EGTA ligand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.