Polyvinyl alcohol containing polyaluminum chloride flocculants
US4795585A · kind A · utility
2Cited by
15References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 24, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/54
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Polyvinyl alcohol (PVA) can be effectively utilized as a floc conditioner during the formation of polyaluminum chloride. The polyvinyl alcohol can be effectively incorporated into the composition either before basification (pre-addition) or afterwards (post-addition). When added to concentrated aluminum containing solutions (8-9% Al.sub.2 O.sub.3), polyvinyl alcohol is preferably used at concentrations up to about 2500 ppm. Higher concentrations may exhibit overdose behavior with progressively decreasing effectiveness. The preferred dosage is about 1750 ppm of PVA for synthetic laboratory water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.