Metal scavenger and metal scavenging process
US4670180A · kind A · utility
16Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1986 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Apr 18, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A metal scavenger is composed of an addition product of a polyamine and an epihalohydrin. The addition product contains as substituent or substituents at least one carbodithio group and/or at least one carbodithioate salt group introduced therein by substituting the corresponding number of active hydrogen atom or atoms in the addition product. Metals can be scavenged from waste water by adding the metal scavenger together with at least one of sodium monosulfide, sodium polysulfides and sodium hydrogensulfide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.