. Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products. ur per cent, on cane, when the weight of juice is the same as that of the cane. x\ctually when usingsulphur only on second carbonated juices the consumption is found tobe about o-02 per cent, on cane, in sulpho-defecation processes about0-04 per cent, on cane, and in Bachs scheme it rises to o-i per cane. As sulphur burning to 502 requires oxygen equal to the weightof the sulphur, the air required will be 4-5 lbs. Actually due to ineflicienc\9 lbs. air
. Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products. ur per cent, on cane, when the weight of juice is the same as that of the cane. x\ctually when usingsulphur only on second carbonated juices the consumption is found tobe about o-02 per cent, on cane, in sulpho-defecation processes about0-04 per cent, on cane, and in Bachs scheme it rises to o-i per cane. As sulphur burning to 502 requires oxygen equal to the weightof the sulphur, the air required will be 4-5 lbs. Actually due to ineflicienc\9 lbs. air should be allowed in design. The volume of air remaining imchangeddiuing combustion, per lb. of sulphur there will be at the normai temperature125 c. ft. to be pmnped. The maximum volume per cent, of sulphiu: dioxidein the gas will be 20-8 per cent., and with twice the necessary- quantity ofair admitted this wiU fall to 10-4 per cent. These data give all the essentialsrequired for design. Hydrosulphites.—The bleaching effect of hydrosulphurous acid was firstemployed in Ransons process,^ which passes sulphur dioxide into juices. 294 CHAPTER XVI in the presence of tin or of zinc. About 1904 stable hydrosulphites weremanufactured, the calcium salt being sold under the name of Redos and the sodium salt as Blankit. These react under the equation,Na^SP^ + 0 + H^O — iNaHSOg. In the cane sugar industry they havebeen chiefly employed in the decolorization of syrups in white sugar manu-facture. As the bleached material colours again on exposure to the air, thej^are used in the vacuum pan shortly before striking. The quantity requiredto obtain the maximum effect varies with different juices. With those thatthe writer has had to deal, it is about one lb. per ton of sugar, though themakers state that considerably less is usually required. The claim that sosmall a quantity can materially affect the viscosity is unworthy of con-sideration. Phosphoric Acid and Phosphates.—Phosphoric aci
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