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ELECTEOLYTIC HYDROGEN AND ^OXYGEN. OZONE 3 Experimentally determined minimum voltages necessary for decomposing, continuously, such aqueous solutions be- tween platinum electrodes approximate closely to 1*67 volts. Since 1 gram of hydrogen is liberated by the passage of 96,500 coulombs of electricity, therefore 1 amp.-hour (3600 coulombs) will liberate 0"037 gram or 0'0147 cubic foot at normal temperature and normal atmospheric pres- 1 sure (N.T.P.). The amount of current generally passed through an in- dustrial unit is about 400 amps., and this will discharge approximately 400 x '0147 =* 5'88 cubic feet of hydrogen per hour and simultaneously 2*94 cubic feet of oxygen. This amount of gas will be discharged by 400 x 1*67 = 668 watt-hours or 0*668 K.W.H., hence one KW.H. will dis- charge 8'8 cubic feet of hydrogen. In practice the volume of hydrogen obtained is 4'5 - 8*25 cubic feet per KW.BL The following statement will convey some indication of the energy utilised annually in a typical installation designed to give about 15,000 cubic feet of hydrogen per day: If the working day be 24 hours for 300 days per annum, the yearly output will be 15,000 x 300 = 4,500,000 cubic feet. Each cell takes about 400 amps, at 2 volts, that is, 0*8 KW.H. per hour, and if there be 100 units in the plant, the energy utilised each year will be 100 x -8 x 24 x 300, or 576,000 KW.H. To this must be added approximately 25 per cent, to allow for loss x That is a temperature of 0° 0., and the pressure of a column of mer- cury 760 mm. high at latitude 45° and at sea level; the temperature of the, mercury being 0° C.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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