Basf Se Corporation

Ralf Mar

Robert Bayer

Marianna Pierobon

Tobias Petsch

Hermann Josef Feise

Julia Brodersen

Helmut Meffert

Ates Erk

Jörg Kreβ

Ralf Lachmuth

Jörg Kress

Methods for regenerating filter aids which comprise inorganic, natural or semisynthetic filter aids. The method comprises subjecting the filter aid to a first treatment with an aqueous alkaline solution, treating the filter aid with enzymes, treating the filter aid with a surfactant, and subjecting the filter aid a second treatment with the aqueous alkaline solution. The enzyme treatment and the surfactant treatment steps may be carried out simultaneously or in any order.

Method for regenerating a filter aid

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.

Method for regenerating an auxiliary filtering agent

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Hochspeyer, Germany

Ralf Mar