Method and apparatus for the performance of selective electrodialysis
US4246092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1978 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Dec 28, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/82
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention provides a method for the performance of selective electrodialytic separation of a first group of charged ions from a solution containing other charged ions having the same sign and optionally the same valence as said first group comprising applying a current to an electrodialysis unit comprising at least one thin, dense, non-porous charged electrodialysis membrane made of water-insoluble hydrophobic polymeric material, containing covalently bound ionizable groups, wherein said membrane separates at least one diluting compartment from at least one concentrating compartment in said unit and wherein said membrane is in the form of a polymeric matrix optionally supported on a porous support and having a preselected dielectric constant and composition adapted to induce selective ion disassociation of said first group of charged ions whereby there is achieved a substantial ion migration of said selected ion group and its preferential transference across said membrane at a fraction larger than its relative concentration in said solution. The invention also provides a selective electrodialysis unit per carrying out said method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.