Explosives . s of the retort. Fig. 68shows a retort on this principle made by F. H. Meyer, of Hanover. The traysof acetate are placed on trolleys, two of which are wheeled bodily into theretort. The latter is heated as uniformly as possible by means of a Dumberof fires. When the charge is finished, the trolleys are wheeled out and twofresh ones are run in at otice. Thus loss of heat is avoided, and the disagree-able operation of drawing the very dusty spent lime from the retort is muchimproved. From the retort the vapours are led to a condenser, which musl be boconstructed that the tubes can e
Explosives . s of the retort. Fig. 68shows a retort on this principle made by F. H. Meyer, of Hanover. The traysof acetate are placed on trolleys, two of which are wheeled bodily into theretort. The latter is heated as uniformly as possible by means of a Dumberof fires. When the charge is finished, the trolleys are wheeled out and twofresh ones are run in at otice. Thus loss of heat is avoided, and the disagree-able operation of drawing the very dusty spent lime from the retort is muchimproved. From the retort the vapours are led to a condenser, which musl be boconstructed that the tubes can easily be cleaned, as they are liable to Ik comechoked with tar and dust. The crude distillate separates into two layers,the heavier of which consists mostly of water and acetone with some methyl-ethyl-ketone and other impurities, the lighter one of methyl-ethyl-ketoneand tarry matter with impurities such as dumasin. and there is some waterand acetone dissolved in it. The mixture is pumped into a tank rendered. Fig. 68. H. Meyers Plant for the Dry Distillation ofAcetate of Lime. EXPLOSIVES - • alkaline with caustic soda and allowed to settle. The heavier lave:run off. and the lighter U vera! times with water. These calk liquors are then pumped into a -till, such as that - iiagranimatically in Fig. 69. The essential feature of this is that part of the va < on- densed in the tubular condeiw-r. D. and returned to the column. C. where itflows over a number of perforated plates The _ of the vapour through each of th-plates is equivalent to a fresh remainder of the vapour - lown thetube. F. to the condenser. D. From thliquid flows through the still-watcher. H. to adrum or other receiver. Continuous workingstills are made on the same principle. With such a distilling plant there is nodifficulty in getting the acetone free fromwater, but the removal of the other impuritiescauses considerable trouble. As the distillateruns through the still-watcher, continuousserva
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