Solvay Deutschland Gmbh

Solvay Fluor Und Derivate Gmbh

Solvay Fluor Gmbh

Alfred Ottmann

Hans-Walter Swidersky

Gerhard Neuenfeldt

Heinz-Joachim Belt

Andreas Becker

Thomas Born

Placido Garcia-Juan

Hubert Schindler

Helmut Derleth

Karl-Heinz Bretz

Armin Klesing

Rutger Van Santen

Aluminum parts, e.g., heat exchangers, with improved resistance towards corrosion caused by contact with stationary water or aqueous compositions such as cooling water can be obtained by addition of Li compounds in specific amounts to the flux used for brazing the parts. LiF and especially Li fluoroaluminates are very suitable. The flux and the Li salt can be dispersed in water or an aqueous composition separately.

Flux forming an insoluble brazing residue

Aluminum parts, such as heat exchangers, with improved resistance towards corrosion caused by contact with stationary water or aqueous compositions can be obtained by addition of Li compounds to the flux used for brazing such parts. LiF and especially Li fluoroaluminates are very suitable. Another aspect of the invention concerns fluxes containing Li salts and their use for brazing of aluminum parts.

Anticorrosive flux

A flux based on alkali fluoroaluminate is described which is highly suitable for dry application ('dry fluxing'). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Brazing flux for dry application

A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (&ldquo;dry fluxing&rdquo;). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

The invention relates to a method for removing chlorate ions from solutions by means of catalytic treatment in the presence of hydrogen. According to the invention a rhodium and/or platinum catalyst is used. The choice of catalyst carrier depends on the amount of coadsorbents contained in the solution. The carrier material, which may be oxidic or non-oxidic, should also be easily wettable.

Method for removing chlorate ions from solutions

A process for regenerating a supported noble metal catalyst and also a process for catalytic treatment of wastewater containing, in particular, organohalogen contaminants, in which the process for regenerating the catalyst is a part of the overall wastewater treatment process.

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Hannover, Germany

Alfred Ottmann