Chemical engineering . lion partsof lead. Electrolysis of Sodium Sulphate.—H. S. Anderson. 31. .\pplication filed June 21. general problem of the electrolytic production ofcaustic soda and sulphuric acid from sodium sulphate wasdiscussed on page 286 of our .August issue. H. S. .Ander-son uses for this purpose a combination of a mercurycathode cell and a diaphragm cell. If simply a diaphragmcell would be used, the recombination of the anodically-formcd sulphuric acid and of the cathodically-formed caus-tic soda could not be effectively prevented. For thisreason a mercury c
Chemical engineering . lion partsof lead. Electrolysis of Sodium Sulphate.—H. S. Anderson. 31. .\pplication filed June 21. general problem of the electrolytic production ofcaustic soda and sulphuric acid from sodium sulphate wasdiscussed on page 286 of our .August issue. H. S. .Ander-son uses for this purpose a combination of a mercurycathode cell and a diaphragm cell. If simply a diaphragmcell would be used, the recombination of the anodically-formcd sulphuric acid and of the cathodically-formed caus-tic soda could not be effectively prevented. For thisreason a mercury cathode is used, the sodium ions whendischarged forming an amalgam which is decomposed ina different compartment. It is also necessary, however,to prevent the anodically formed sulphuric acid from pass-ing over to the mercury cathode. The inventor, therefore,provides a diaphragm above the mercury cathode, and be-low the anodic compartment and further passes a con-tinuous stream of sodium sulphate solution between this. KIG. I.—CELL FOR ELECTKOLYSIS OK SOlUfM diaphragm and the mercury cathode, so that any acidwhich might pass through the diaphragm is carried awaywith this stream of solution and cannot reach (he cross-section of the cell is shown in Fig. 1. A is areservoir containing sodium sulphate. B is the electrolyticcell proper, and C the cell in which the amalgam is de-composed for the production of caustic soda. In B thereis the anode 17, the diaphragm 16 and the mercury cathode12. A continuous stream of sulphate solution is passedbetween 16 and 12: it flows from the supply tank A to theintiow-passage a, then passes between Il and 12. and oflf through the outlet-passage b by a syphon of Gases from Electrolysis.—G. E. Cassel, 804,-031. Nov. 21. .Application filed May 4. 1905,To prevent the gases developed either at the anode orat the cathode from passing over to the other electrode, heconstructs each electrode as follows: Ea
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