Process for reducing the concentration of multivalent cations in aqueous solutions
US5885462A · kind A · utility
5Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1997 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | May 5, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The process consists in passing the liquid to be purified and a superabsorbent, preferably of polyacrylic type, through a column, the upward speed of the liquid being chosen such that, in the column, the superabsorbent which is merely swollen is in a stationary dynamics regime, whereas the superabsorbent laden with polyvalent ions settles at the bottom of the column. Application to the treatment of the aqueous rinses of articles which have undergone a nickel-plating treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.