Charged filter aid material and ion exchange bed
US4190532A · kind A · utility
28Cited by
5References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1977 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Oct 21, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J47/133
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for preparing an improved filter material, together with the improved material prepared thereby and an improved method for removing impurities from a liquid. The filter material comprises a mixture of ion exchange resin particles and treated filter aid material. In the preferred embodiment, the ion exchange resin particles comprise a mixture of anion and cation exchange resin particles, and the filter aid material is treated with a chemical compound to produce a positive surface charge thereon. The filter aid material may be further treated with a second compound to produce an enhanced negative surface charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.