Purification of liquids with treated filter aid material and active particulate material
US4238334A · kind A · utility
71Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Sep 17, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and filter bed for removing impurities from liquids wherein the filter bed comprises a mixture of treated filter aid material and an active particulate material having opposite surface charges in aqueous suspension. The filter aid material has been treated to produce the desired surface charge. The identity of the active particulate material depends on the application. Examples are organic polymeric absorbents, zeolites, bentonite, zirconium oxide, zirconium phosphate, activated alumina, ferrous sulfide, activated carbon and diatomaceous earth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.