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FLUORINE 37 solution, and he proved that current density was of small moment compared with the importance of current con- centration . For large-scale production two-compartment cells are employed, and it is advisable to use freshly-prepared bisulphite in the process. 1 According to one patent, dilute sodium bisulphite is electrolysed in the cathode compartment, and the addition of neutral chloride or sulphate is recommended in order to increase the yield. During electrolysis the temperature should be kept at 0-5° 0. and sulphurous acid added to the electrolyte continuously. 2 According to another patent, the process may be made continuous by circulating the bisulphite solution through the cells from a reservoir, and when the liquor becomes sufficiently concentrated the hydrosulphite separates in a solid form. 3 A French patent claims the utilisation of zinc sponge prepared electrolytically for reducing sulphite to hydro- sulphite. FL TJOBLNE. This gas was isolated by H. Moissan in 1887, by the electrolysis of anhydrous hydrofluoric acid containing pot- assium fluoride. This salt rendered the anhydrous acid a conductor, and the electrolysis was effected in apparatus 1 2 s D.B.P. 276058,276059 (1912); 241991 (1910). Ibid. 278588 (1912); Eng. Pat. 13901 (1913). Pr. Pat. 467443 (1914).PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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