Patent · US Expired

Process for cleaning wastewater and recirculating water in paper production, de-inking and bleaching of pulp

US6190503A · kind A · utility

1Cited by

2References

8Claims

0Family size

Assignee

BASF SE

Inventors

Friedrich Linhart · Heidelberg, DE
Manfred Niessner · Schifferstadt, DE
Martin Rubenacker · Altrip, DE
Claudia Nilz · Rödersheim-Gronau, DE

Key dates

Filing date	Mar 19, 1999
Grant date	Feb 20, 2001
Priority date	—
Expiry date	Mar 19, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/928
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

Wastewaters and circulation waters in papermaking, in deinking and in pulp bleaching are treated by adsorption of water-soluble anionic compounds and compounds dispersed in water from the wastewaters and circulation waters over finely divided adsorbents which consist of insoluble, only slightly swellable polymers which contain polymerized vinylamine units, and these polymers are used as adsorbents for treating water circulations in papermaking and for treating paper machine wastewaters and wastewaters from the deinking process and from pulp bleaching.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.