Basf Aktiengesellschaft

Basf Se Corporation

Klaus-Dieter Hoppe

Bernd Leutner

Holger Friedrich

Kurt Hecky

Werner Steck

Helmut Jakusch

Jenoe Kovacs

Rainer Feser

Dieter Schl&auml;fer

Siegfried Schreiner

Dieter Schlafer

Peter Palm

Ulrich Br&ouml;ckel

Paul Bever

Matthias Kraume

Joachim Grams

Thomas Speck

Veit Hagenmeyer

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

The rates of oxidation of sulfite/bisulfite-containing solutions in gas-liquid scrubbers for removing SO.sub.2 from gases are reduced by adding oxidation inhibitors to the solutions in an amount of from 0.02 to 20 mmol per hour and per square meter of exchange area.

Reduction in the rate of oxidation of sulfite solutions

Ferromagnetic metal particles of substantially iron are prepared by starting from an acicular .alpha.-FeOOH, applying a shape-stabilizing finish to the particle surface, heating at 500.degree.-850.degree. C. and subsequently reducing with gaseous reducing agents at 200.degree.-500.degree. C. to the metal, and starting .alpha.-FeOOH being prepared in the presence of zinc and phosphate ions.

Preparation of acicular ferromagnetic metal particles of substantially

Wash solutions containing Fe(II) and Fe(III) chelate complexes and used for removing NO.sub.x from waste gases are regenerated by treatment with sodium tetrahydroborate.

Regeneration of wash solutions containing Fe(II) and Fe(III) chelate

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Wachenheim, Germany

Klaus-Dieter Hoppe