Bayer Aktiengesellschaft

Bromerc Limited

Bernhard Vosteen

Claus Mueller

Theodore-Gerhard Bonkhofer

Olaf Fleth

Karlheinz Wolf

Reinhold Hornle

Hans-Heinz Molls

Vaclav Kaspar

Peter Schnegg

Georg Dehmel

Burkhard Braun

Joachim Beyer

Reiner Skerhut

Michael Nolte

Andrea Wieland

Heinz Koeser

Walter Rapp

Andreas Pohontsch

Joachim Lemke

Adolf Sinn

Thomas Melin

Andrea Schnitzer

Rico Kanefke

Heinz-G&uuml;nther Weissenberg

Ewa Kanefke

Ewa Standau

Process for removing mercury from flue gases of high-temperature plants, in particular power stations and waste incineration plants in which a bromine compound is fed to the multistage furnace and/or the flue gas in a plant section downstream of the furnace, the temperature during contact of the bromine compound with the flue gas being at least 500&#xb0; C., preferably at least 800&#xb0; C. The combustion is carried out in the presence of a sulphur compound, in particular sulphur dioxide. Subsequently to the furnace, the flue gas is subjected to an optional multistage cleanup for removing mercury from the flue gas, which cleanup comprises a wet scrubber and/or a dry cleanup.

Process for removing mercury from flue gases

A process is described for dewatering sewage sludge consisting of the combination of an acidic oxidative preconditioning with an inorganic post-conditioning, in which case the preconditioning comprises an acidification of the sewage sludge and a catalytic partial oxidation by addition of a substoichiometric amount of hydrogen peroxide and iron ions at a pH&lE;5 and then an inorganic post-conditioning is carried out in which the acidified and partially oxidized sewage sludge is admixed with alkaline earth, and in which case, in the inorganic post-conditioning, sufficient calcium hydroxide (Ca(OH) ) is supplied so that the pH of the limed sewage sludge is in the range from at least 9 to at most 11, in order thereafter to dewater the conditioned sewage sludge mechanically.

Conditioning method for dehydrating clarification sludge

Process for preparing granules of water-insoluble solids, characterized in that a non-thixotropic press or filter cake of the solid is comminuted by cutting and the product obtained is dried while in rolling motion in a dryer for pourable solids.

Process for preparing granules of water-insoluble solids

The thin film contact dryer consists of a rotor having flat rotor elements extending in a radial direction. In the central third of the rotor is arranged at least one combination of distributing elements and an annular weir which revolves with the rotor and leaves a narrow annular gap open to the internal dryer wall, the annular weir being arranged immediately downstream of the distributing elements as viewed in the direction of flow.

Thin film contact dryer

Alkali metal salts of hydroxybenzoates are claimed which are substantially anhydrous and free from hydrobenzoic acid and have the formula ##STR1## in which R.sup.1 denotes alkyl, alkenyl, cycloalkyl or aralkyl,

Process for the preparation of alkali metal salts of hydroxybenzoates,

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Cologne, Germany

Bernhard Vosteen