Process for treating waste water containing polyvinyl alcohol
US4066541A · kind A · utility
7Cited by
1References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | May 19, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/34
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for treating waste water containing polyvinyl alcohol (designated hereinafter as P.V.A.) comprising separation of the P.V.A. in the form of a compound with boric acid which is produced at pH 8 to 10 by a reaction with boric acid or borax added in the presence of an inorganic salt such as sodium sulfate, and using thus regenerated liquid repeatedly, and a process of utilizing waste containing P.V.A. for desizing textile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.