Method of treating pulp bleaching effluents
US4268350A · kind A · utility
12Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Sep 18, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for cleaning effluents from bleaching plants which use ultrafiltration for cleaning, preferably after the first extraction stage, by dividing the ultrafiltration into two stages, and between them inserting an alkali treatment stage. The high molecular chlorine compounds are thereby split into innocuous sodium chloride in the permeate from the second ultrafiltration stage, which can be returned to the extraction stage so that with the alkali excess after the splitting, it can cover all or part of its alkali requirement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.