Bayer Aktiengesellschaft

Michael Batz

Hans-Dieter Block

Rainer Weber

Hans-Heinrich Moretto

Norbert Lonhoff

Rainer Bellinghausen

Bernhard Spreckelmeyer

Uwe Arndt

Heinrich Helker

Hans Rinkes

Andreas Bulan

Dieter Heinz

Wolfgang Ohlendorf

Peter Schmidt

Hans-Georg Nieder-Vahrenholz

Gerhard Jonas

Jost Halstenberg

Roland-Luiz Roth

Dawie Van Der Merre

Kasper Hallenberger

Paul Strehlow

Michael Lumm

Process wherein the vanadium present in the chromium ore chromite is recovered as vanadium pentoxide during the course of the fusion of the chromium ore with alkali and its work-up to produce sodium chromate solution and sodium dichromate.

Process for the utilization of vanadium from chromium ore as vanadium (V) oxide

The invention relates to a novel process for preparing fluorosulfonic acid having low contents of low-boiling compounds in which hydrogen fluoride and sulfur trioxide are combined in stoichiometric amounts in a reaction vessel or by means of a reaction nozzle, the hot, gaseous fluorosulfonic acid that is formed is fed directly into a distillation column, and the fluorosulfonic acid is taken off at the bottom of the column or in the stripping section of the distillation column.

Process for preparing fluorosulfonic acid having low contents of low-boiling compounds

A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.

Method for manufacturing alkali chromates from chromium ore

A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.

A process for the removal of organic impurities and dissolved salts from hydrazine hydrate and aqueous solutions thereof by distillation of the hydrazine hydrate under reduced pressure, passing the hydrazine hydrate vapor through an adsorbent, and condensing the vapor.

Process for the removal of impurities from hydrazine hydrate

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Leichlingen, Germany

Michael Batz