Abstract
The optimum conditions for the electro-chemical formation of sodium persulphate from aqueous sodium sulphate have been investigated with respect to the bath, composition, anodic and cathodic current densities, interelectrode distance, temperature, duration of the electrolysis, current concentration, the influence of “addition agents” and the use of a diaphragm. A strongly acidic bath favours the reaction. At the optimum temperature.viz., 10°C. high anodic current densities up to 82·2 amps./dm2 are advantageous. The process is complicated by the fact that after about 2 amp. hours the persalt tends to separate as a solid phase. Our results do not support Muller’s hypothesis of a ‘steady state’ in the corresponding sulphuric acid electrolysis. A current efficiency as high as 92·7% has been obtained with a diaphragm, HF as ‘addition agent’ and special concentration (vide infra) of the bath solution. From a review of the various theories of persulphate formation, our results are in accord with Richardz’s view,viz., that persulphuric acid is produced by the polymerisation of discharged HSO4-ions at the anode.
Published Version
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