Explosives . exist at the RoyalGunpowder Factory. Its abolition was rendered possible by the fact thatthe addition of water to the waste acid not only prevents the formation ofmore nitro-glycerine, but also absorbs any that exists as minute globulesin the waste Originally only 2 per cent, of water was added to thewaste acid, as this quantity was found to be sufficient at the normal tempera-ture of storage, 10° to 15° C., to prevent any further separation. But on 1 Got. Pttt. Anui. 31,837, Julj 6, 1910; , 1912, p. 36. - Nathan, Thomson and Rintoul, Eng. Pat. 3020, February 9, 1903. M
Explosives . exist at the RoyalGunpowder Factory. Its abolition was rendered possible by the fact thatthe addition of water to the waste acid not only prevents the formation ofmore nitro-glycerine, but also absorbs any that exists as minute globulesin the waste Originally only 2 per cent, of water was added to thewaste acid, as this quantity was found to be sufficient at the normal tempera-ture of storage, 10° to 15° C., to prevent any further separation. But on 1 Got. Pttt. Anui. 31,837, Julj 6, 1910; , 1912, p. 36. - Nathan, Thomson and Rintoul, Eng. Pat. 3020, February 9, 1903. MANUFACTURE OF NITRO-GLYCERINE 219 January 15, 1906, a fatal accident occurred with a drum of nitro-glycerinewaste acid, which was part of a consignment sent by the Explosives andChemical Products Ltd., to Messrs. F. W. Berk and Co. In consequence ofthis, further experiments were carried out at Waltham Abbey, which aregiven in detail in Special Report No. 174 of Chief Inspector of Explo- JL^ WATER TANK. s>T0 WASTC ACID ECCS Fig. 42. Waltham Abbey Nitrating-Ho use Plant sives. It was then found that in order to prevent further separation of nitro-glycerine, when the temperature of the waste acid is reduced to 0° C. it isnecessary to add 5 per cent, of water. The fact that when the temperatureis reduced the solubility of nitro-glycerine in waste acid is considerably dimin-ished should be kept constantly in mind. In Germany, where large variationsof temperature are more liable to occur than in England, there have beenseveral accidents due to the further formation of nitro-glycerine on the surfaceof acid that had been subjected to after-separation for a considerable the waste acids arc treated, they should not afterwards be allowedto fall to a very low temperature, and 1 lie- denitration should take place as 22n EXPLOSIVES sooi: -ible. If after-separation has taken place without the addition of water, the acid should afterward- be kept at a higher temperature
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