Explosives . e ofthe former. The towers are square in section and lined with lead : insidethere are frames, which are wound with strands of wool zig-zag fashion. Atthe top of the tower each strand dips into a trough, which is kept suppliedwith bisulphite solution. The to]) of the tower is closed by means of a glassplate, and there is also a glass window near the bottom, so the action of thetower can be watched. There are, of course, various pumps or eggs andtanks, so that the solution can be raised again and passed down the sametower again, or the next one nearer the stove. When the solution i
Explosives . e ofthe former. The towers are square in section and lined with lead : insidethere are frames, which are wound with strands of wool zig-zag fashion. Atthe top of the tower each strand dips into a trough, which is kept suppliedwith bisulphite solution. The to]) of the tower is closed by means of a glassplate, and there is also a glass window near the bottom, so the action of thetower can be watched. There are, of course, various pumps or eggs andtanks, so that the solution can be raised again and passed down the sametower again, or the next one nearer the stove. When the solution is nearlysaturated with acetone it is transferred to a still, where it is simply heated to 1 P. et If,, 1912, |). 1<)8. - Eng. Pat. 25,994 of L901; ( Pat. 723,31] of 1903. 3 Eng. Pat. 25,993 of 1901. 350 EXPLOSIVES drive the acetone off again, as it has been found that practically the wholeof the acetone can be distilled off before the bisulphite begins to decompose. gffa f-^UI »»*:» — (~. Fio. Tii. Scrubbing Towers (Robertson and Rintouls JV A littl«- sodium carbonate or caustic Boda i- added, however, to diminish theamounl f sulphur dioxide that passes over, and to combine with any freesulphurous acid that has been formed by the oxidation of the bisulphite,and the consequent formation of sodium Bulphate. The crude distillate thusobtained i- mixed with water and a little sodium carbonate, and distilled againfrom a >till Buch a- that shown in Fig. 69. It i- thus obtained in an extremely SOLVENTS 351 pure state ; it contains no detectable quantity of any impurity except someethyl-methyl-ketone, which is harmless, and a trace of carbonic acid. The —-- to6 O 3 o Per Cent. Acetone by to 10 i+o ro to ?o go fa / o ?00020•00016-00012 00008 00004 too fO Zo /6 0 i<*o a o5 So < o S-i 60 g 0/ Ph u <*o S Jo po ro tf<? ^ *<j Jo Per CVnt. Nitro-glycerine by Weight. Fig. 71. Vapour Pressures uf Mixtures of Acetone and Nitro-glycerine at 18
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