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JOURNAL OF THE AMERICAN PUBLIC HEALTH ASSOCIATION 117 Taling the best of these we find that with the current costing 2 cents perkilowatthouronepoundofavailablechlorinewouldcost5.5centsfor elcetrical energy alone. Among the more recent cels that have attracted some attention are theDaytonCellandtheHass-Oettel. ThefirstisdescribedbyRickards* and his most favorable results show that one pound of available chlorine can be made with 2.62 kilowatt hours of current and 6.9 pounds of salt. These figures were obtained by keeping the electrolyte at a very low temperaturebymeansofice. Withoutthecoolingprocess3.62kilowatt hours and 7.2 pounds of salt were necessary. With the second cel Duckwortht was able to make one pound of available chlorine using 2.84 kilowatt hours and 11 pounds of salt. Inourown experimentsandinthepracticaloperationofthecelsthat have been subjected to practical tests, it has been necessary to use an electromotiveforceof4to4.5voltstocarrythecurrentthroughthesalt solution. Onaccountofthesidereactionsinvolvedcurrenteficiencies havebeenlow,andowingtothefalin efficiencywhichaccompaniesthe proportionofhypochloritepresentintheelectrolyte,theresultantliquid always contains large quantities of sodium chloride in its original form and rarely more than 18% or 20% of the chlorine present in the form of chlorideisconvertedintohypochlorite. Eventhoughacheapcurrentis available, further salt savings than have yet been secured are necessary, beforeelectrolyzers,inwhichtherecombinationoftheanodeandcathode productstakeplaceinthemainbodyoftheelectrolyte,cancompetewith calcium hypochlorite. * Quarterly Bulletin Ohio State Board of Health, Oct.-Dec., 1909. tSoc.ofChem. Industry. Nov.,1905.PDF Image | ELECTROLYTIC PRODUCTION OF SODIUM HYPOCHLORITE
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