Method for separation of polyvinyl alcohol from aqueous solutions thereof using peroxodisulfates
US5110481A · kind A · utility
4Cited by
8References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 10, 1991 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | May 10, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/908
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for separation of PVA from an aqueous solution thereof such as the waste water containing PVA from the pretreatment of a textile product, in which a peroxosulfate such as ammonium peroxosulfate is added to an aqueous PVA solution, particularly in an acidic condition with addition of sulfuric acid, at a temperature above 70.degree. C. for the separation of PVA, and as a result the thus separated PVA contains only a small amount of water in the range of about 60-70% and can easily be treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.