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16 THE MANTJFACTUBE OF CHEMICALS BY ELECTBOLYSIS at a platinum anode if a high current density be main- tained. The amount of ozone may be increased by employing a water-cooled anode so that the temperature in its neigh- bourhood is at 0*C. or lower. 2 With a current density of 80 amps, per cm. and a volt- age of 7*5 volts the oxygen evolved from 15 per cent, sulphuric acid contains 28 grams of ozone per cubic metre, 1 equivalent to a yield of 7\L grams per K.W.H. Alkaline solutions yield considerably less ozone, and are 2 A method suitable for producing large quantities of ozone 3 has been devised by Archibald and Wartenburg in which alternating current is superimposed upon the direct current used for electrolysis. The amount of ozone obtained by this means is very much greater than that produced by direct current alone, and the improvement is no doubt due to the depolarising effect of the A.C. at the anode. This same beneficial effect is made use of in Wohlwill's improved process for gold refining, and this advantageous combination 4 of D.C. and A.C. is referred to later in connection with other electro-chemical processes. In an experimental run, a maximum yield was obtained with an A*C. of 6 amps, and a D.C. of '25-1 amp. The sulphuric acid employed had a density of 1'48, and the most 2 not suitable for the preparation of this gas. suitable current density was found to be 33 amps, per dm. 12 Zeitsch. anorg. Chem., 1907, 52, 202. Ibid., 1903, 36, 403. sZeitsch. Elektrochem., 1911,17, 812. * Page73.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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