Basf Aktiengesellschaft

Hans Roos

Knut Bittler

Hugo Boehn

Dieter Schlaefer

Gerd Wunsch

Dieter Degner

Heinz Hannebaum

Volker Kiener

Heinz Kilthau

A gas-evolving metal electrode consists of profiles which are arranged parallel to one another in a horizontal plane and are connected to one another by means of current distributors. The profile surfaces which face the counter-electrode are curved, the curvature at the sides being more pronounced than that in the middle. The profile is terminated above by means of two lateral surfaces tangential to the curvature. The electrode is useful as an anode for mercury cells for the chloralkali electrolysis.

Gas-evolving metal electrode

Bipolar electrodes with graphite as the carrier have a layer of chromium trioxide not less than 10 .mu.m thick on both the anode face and the cathode face. The electrodes are produced by plasma-spraying chromium trioxide powder onto a graphite layer, and can be used as bipolar electrodes in alkali metal chloride electrolysis cells.

Bipolar electrodes with graphite as the carrier and their production

A process for the preparation of alkyl-substituted benzaldehydes by electrooxidation of alkylbenzenes using graphite anodes coated with metal oxides or with carbides.

Preparation of alkyl-substituted benzaldehydes

In an electrode suitable for electrolysis of aqueous sodium chloride or potassium chloride solutions, at least the outer layer contains spinels, specifically a mixture of the individual spinels of iron and of cobalt, the weight ratio of iron spinels: cobalt spinels being from 30:70 to 90:10. The electrodes are produced by applying a powder mixture of iron spinel and cobalt spinel to a substrate by a plasma spraying process wherein argon is used as the plasma gas and the spraying energy is from 6 to 30 kW.

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Bad Durkheim, Germany

Hans Roos