Journal . cess. .Messrs. Cross and Bevan have presented us with acalculation of the cost of producing bleaching solutionby the Hermite process equivalent to one ton ofbleaching powder. They take as basis for their calculations— (1.) One ampere-hour yields r47grms. of availablechlorine, which, in my way of expressing results, is acurrent efficiency of 1097 per cent. (2.) They assume that i^ie available chlorine pro-duced has greater bleaching efficiency than the sameamount of available chlorine in bleaching powder inthe proportion 3 : 5.* (3.) They assume that the waste of magnesiumchloride is
Journal . cess. .Messrs. Cross and Bevan have presented us with acalculation of the cost of producing bleaching solutionby the Hermite process equivalent to one ton ofbleaching powder. They take as basis for their calculations— (1.) One ampere-hour yields r47grms. of availablechlorine, which, in my way of expressing results, is acurrent efficiency of 1097 per cent. (2.) They assume that i^ie available chlorine pro-duced has greater bleaching efficiency than the sameamount of available chlorine in bleaching powder inthe proportion 3 : 5.* (3.) They assume that the waste of magnesiumchloride is inappreciable. (4.) That an installation including dynamo for acurrent of 1000 amperes and 5 volts, steam engine,leads, and tanks, comprising platinum anodes, willcost i350 ; every such unit giving the equivalent ofJ ton of bleaching powder in 24 hours, or 1 ton perweek. They thus arrive at the result that the equivalentof one ton ot bleaching powder costs £2 10s. I will discuss these points one by To 20 zo 4CT at Svltxl/viciXy ^umi and disintegrated; the gasesevolvedjcontaincarbonic-acid to the amount of 3 per cent. But what are thechief products of the oxidation of the carbon, I havenot ascertained. The solutions are coloured yellowwhen electrolysed by carbon anodes. (I.) ^Ye will accept, for the moment, the basis, but • These two statements together mean that 1000 amperesdecomposing MgCl- will give chlorine compounds of suchefficiency as would equal free chlorine gas produced by 1800amperes. 311 THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. | examine to what extent we should have to push theelectrolysis in order to produce a bleaching solutioncontaining, say, ogrms. of available chlorine, which isas much as a solution of bleaching powder of aboutL° Tw. would contain. SinceaSj percent, solution ofchloride of magnesium contains, in round numbers,20grms. of chlorine per litre, we should have to carryon the electrolysis until 25 per cent, of t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
