Method for regenerating an auxiliary filtering agent

US7993533B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Helmut Meffert · Mannheim, DE
• Marianna Pierobon · Ludwigshafen, DE
• Tobias Petsch · Morbach, DE
• Julia Brodersen · Hamburg, DE
• Hermann Josef Feise · Kleinniedesheim, DE
• Ates Erk · Karlsruhe, DE
• Jörg Kreβ · Mannheim, DE
• Ralf Mar · Hochspeyer, DE
• Robert Bayer · Sinsheim, DE

Key dates

• Filing date: Sep 27, 2007
• Grant date: Aug 9, 2011
• Expiry date: Sep 27, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J20/3475
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Processes comprising: (i) providing a filter aid comprising a co-extrudate of a water-insoluble polyvinylpyrrolidone and a thermoplastic polymer, (ii) treating the filter aid with aqueous alkali; (iii) subsequently treating the filter aid with an enzyme; and (iv) subsequently thereto carrying out a second treatment with aqueous alkali, to provide a regenerated filter aid, and uses therefor.