Bayer Aktiengesellschaft

Mtu Aero Engines Ag

Heraeus Precious Metals Gmbh & Co. Kg

Rudolf Hill

Friedrich Jonas

Andreas Elschner

Udo Guntermann

Hans-Joachim Schittenhelm

Max Niegl

Nicole Feiling

Wilfried Loevenich

Dieter Mauer

Norbert Rast

Martin Koenitzer

The invention relates to a method for removing Cr(VI) ions from an aqueous electrolyte solution, particularly an electrolyte solution for electrochemical metal machining, which comprises the reduction of Cr(VI) to Cr(III) with Fe(II) ions. The Fe(II) ions are added to the electrolyte solution in the form of an aqueous salt solution which has been brought into contact with an ion exchange resin loaded with Fe(II) ions. The invention further relates to a device () for electrochemical machining of a workpiece () by means of an aqueous electrolyte solution (), which has an ion exchanger () which has been loaded with an ion exchange resin charged with Fe(II) ions.

Method of removing Cr(VI) ions from an aqueous electrolyte solution

The present invention relates to novel processes for preparing an aqueous or nonaqueous dispersion or solution comprising at least one conductive polymer and at least one polyanion, characterized in that the polymerization is performed at a pressure below atmospheric pressure, to aqueous or nonaqueous dispersions or solutions prepared by this process and to the use thereof.

Process for producing conducting polymers

The present invention relates to a process for producing coated bismuth vanadate yellow pigments comprising the following steps:

Process for producing coated bismuth vanadate yellow pigments

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Langenfeld, Germany

Rudolf Hill