Basf Aktiengesellschaft

Kurt Hecky

Holger Friedrich

Bernd Leutner

Dieter Schlafer

Klaus-Dieter Hoppe

Wolfgang Steiner

Dieter Schl&auml;fer

Hans-Michael Schneider

Peter Palm

Rudi Kroner

Ulrich Br&ouml;ckel

Preparation of composite fibers and diaphragms

The flow resistance of a diaphragm based on a fiber material is modified by treating the diaphragm during or after preparation thereof with a dispersion comprising a fluorine-containing component and optionally with a solution comprising a precursor of ZrO.sub.2.

Modification of the flow resistance of diaphragms

A process for the regeneration of plastic diaphragms is described, in which a mineral acid solution is mixed with a suitable corrosion inhibitor, this mixture is temperature controlled at from approximately 0.degree. to 100.degree. C., preferably 40.degree. to 80.degree. C., in particular 50.degree. to 70.degree. C., and passed through the diaphragm for from approximately 0.1 to 84 hours, preferably 1 to 72 hours, in particular 2 to 24 hours.

Regeneration of plastic diaphragm

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Zeiskam, Germany

Kurt Hecky