Extraction of metal ions from an aqueous solution
US5738791A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Sep 17, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J45/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for the making and use of a porous, preferably dimensionally stable, hydrophobic polymer for the extraction of metal ions from an aqueous solution, with the polymer being in the form of a regenerative granulate or powder having an average particle diameter of from 0.1 to 10 mm and pores of from 0.1 to 50 .mu.m, which is obtained by the dissolving of a polymer, with heating, at a temperature above the upper critical demixing temperature Tc in a complexing agent containing hydrophobic liquid, followed by lowering of the temperature, resulting in a porous polymer filled with the hydrophobic liquid, and the mechanical diminution of the solidified mass is disclosed. Favorable results have been attained using polypropylene as the hydrophobic polymer, bis(2,4,4-trimethylpentyl)thio acid as the complexing agent, and with a mixture of dibenzyl toluene and/or polypropylene glycol ether being part of the hydrophobic liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.