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may be identical in all respects with a mixture of strong nitric and strong sulfuric acids, glycerin is universally nitrated in com-imercial practice by means of acid already mixed, and the nitro glycerin is procured by means of gravity separation of the phases. One hundred parts by weight of glycerin yield 225 to 235 parts of nitroglycerin.

One part of glycerin is nitrated with about 6 parts of mixed acid, made up by the use of oleum and containing about 40.0%

Figure 54. Interior of Nitroglycerin Storage House. (Courtesy E. I. du

Pont de Nemours and Company, Inc.)

Figure 54. Interior of Nitroglycerin Storage House. (Courtesy E. I. du

Pont de Nemours and Company, Inc.)

of nitric acid, 59.5% of sulfuric acid, and 0.57o of water. The nitration in this country is carried out in cast iron or steel nitra-tors, in Europe in nitrators of lead. The glycerin is commonly added from a cock, controlled by hand, in a stream about the size of a man's finger. The mixture is stirred by compressed air, and the temperature is controlled carefully by means of brine coils, there being usually two thermometers, one in the liquid, one in the gas phase above it. In Great Britain the temperature of the nitration mixture is not allowed to rise above 22°C., in this country generally not above 25°. If the temperature for any reason gets out of control, or if the workman sees red fumes through the window in the nitrator, then the charge is dumped

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