Flocculant for sludges

US4444667A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans Burkert · Ludwigshafen, DE
• Friedrich Brunnmueller · Ludwigshafen, DE
• Karl-Heinz Beyer · Bischofswerda, DE
• Michael Kroener · Mannheim, DE
• Hans Mueller · Frankenthal (Pfalz), DE

Key dates

• Filing date: Jul 12, 1982
• Grant date: Apr 24, 1984
• Expiry date: Jul 12, 2002

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/34
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Sludges are flocculated by the addition of a polymer which is prepared by the homopolymerization of N-vinylformamide in the presence of a free-radical polymerization initiator to give a poly-N-vinylformamide, followed by hydrolysis of from 10 to 90% of the formyl groups in the poly-N-vinylformamide.