Patent · US Expired

Method for precipitation of sulphonated lignin from sulfide wastes

US4459228A · kind A · utility

1Cited by

4References

11Claims

0Family size

Assignee

Gesellschaft fur Biotechnologische Forschung mbH (GBF) · DE

Inventors

Annegret Haars · Göttingen, DE
Aloys Hüttermann · Göttingen, DE

Key dates

Filing date	Oct 7, 1981
Grant date	Jul 10, 1984
Priority date	—
Expiry date	Oct 7, 2001

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21C11/0007
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for precipitating lignin sulphonates from sulfide wastes, in that a precipitation complex develops by the addition of polycations.

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