Color removal process
US4089780A · kind A · utility
13Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1976 |
| Grant date | May 16, 1978 |
| Priority date | — |
| Expiry date | Aug 6, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/917
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Color is removed from paper mill waste waters by treatment with a cationic water soluble polyamine having an average molecular weight of at least 300 at a pH of 2 to 5, preferably 2.5 to 3.5, followed by precipitation with a water soluble anionic or non-ionic organic polymer having an average molecular weight of at least 10,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.