Explosives . reat difficulty in separating the glycerine fromthe water in tin- distillate, a- the boiling-points are very far apart (290 andion respectively at atmospheric pressure), hut the distillation must be carriedout with proper are to obtain the glycerine in a satisfactory state of glycerine is generally condensed in a series of metal pipes cooled by ex-posure to the air. In the first tubes practically anhydrous glycerine con-denses : in the later one- the condensate i- somewhat dilute. The former onlyi- n-eil for the manufacture of nitro-glycerine. the latter for a variety o
Explosives . reat difficulty in separating the glycerine fromthe water in tin- distillate, a- the boiling-points are very far apart (290 andion respectively at atmospheric pressure), hut the distillation must be carriedout with proper are to obtain the glycerine in a satisfactory state of glycerine is generally condensed in a series of metal pipes cooled by ex-posure to the air. In the first tubes practically anhydrous glycerine con-denses : in the later one- the condensate i- somewhat dilute. The former onlyi- n-eil for the manufacture of nitro-glycerine. the latter for a variety of pur-poses, such a- filling gas-meters, the manufacture \ ink and sizes for textile-. GLYCERINE 205 Fig. 38 shows a distillation plant of the type made by George Scott and Sons,London, and very largely used in England. Over the vertical still shown inthe background is a catch-pot, in which high boiling impurities, such as poly-glycerines are condensed, and material such as salt, that is carried along. Fig. 38. Distillation Plant for Glycerine mechanically by the vapours, is held back. After passing through the air-cooled battery, shown in the foreground, in which the glycerine is condensed,the vapour passes to a condenser cooled with water, where the water iscondensed, and then to a vacuum pump. The cost of distillation is stated tobe about £1 per ton. CHAPTER XVIMANUFACTURE OF NITRO-GLYCERINE Early methods : Injector : Modern plant : Nitrator : Separator : Pre-washtank . Washing : Filtering : Wash-waters : After-separation : Recent im-provexnentfi : Abolition of cocks : Funic hoods : Plugs for air-holes : Soften-ing the washing waters : Washing operations : Labyrinths : Xitrator-separa-tor : Cooling coils : Prevention of after-separation : Drowning arrangement :Adds and yields : Time of separation : Conveyance of nit ro-glycerine : Guttc:Location of factory: Air-supply: Limit boards: Thunder-storms: Generalprecautions : Sensitiveness. In the early days nitroglycerine was mad
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