Phosphoric ester of cellulose derivative and metal adsorbent comprising the same
US7741424B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2005 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Jan 13, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B13/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to a phosphoric ester of 2,3-dihydroxypropyl cellulose or 3-(2,3-dihydroxypropoxy)-2-hydroxypropyl cellulose, the cellulose having optionally undergone partial carbamidation, and to a metal absorbent employing the ester, and to a metal-absorbing apparatus employing the metal adsorbent.The cellulose derivative phosphoric ester serves as a metal adsorbent which exhibits high metal adsorption performance and metal adsorption rate per unit weight; has high mechanical strength; effectively soften water or a similar liquid; removes heavy metals from wastewater or a similar liquid at remarkably high efficiency; has excellent processability and can be formed into a variety of shapes and thus is applicable within a wide range; and can readily be reutilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.