This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...and returned to the process. The materials employed must be thoroughly dry, and during the whole of the distillation the mixture must be stirred by a rod passing through an opening in the door of the retort. As ammonium carbonate begins to sublime at about 50 C, the firing must be done with care and regularity. As soon ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...and returned to the process. The materials employed must be thoroughly dry, and during the whole of the distillation the mixture must be stirred by a rod passing through an opening in the door of the retort. As ammonium carbonate begins to sublime at about 50 C, the firing must be done with care and regularity. As soon as a charge is exhausted it is drawn from the retort and a fresh one introduced, and the sublimation proceeds for fourteen or fifteen days before the receivers are opened to remove the product. The condensed carbonate forms crusts, somewhat coloured by tarry matter, and rendered impure by small quantities of lime salts carried over by the current of gas. It is purified by a resublimation, conducted very slowly in cast-iron pots, 0-33 m. in diameter and 0-75 m. high, covered with leaden domes, and heated by the flue gases of the retort furnaces. These pots are sometimes replaced by large pans, 4 or 5 m. long, 0-75 m. wide, and 0-75 m. deep, covered with cast-iron plates luted on air-tight, and pierced with eight circular holes 0-33 m. in diameter, on which the leaden domes are adjusted. The crude salt from the chambers is placed in the tank with a certain quantity of water, and the leaden domes having been put in their places, the boiler is gently heated, the heat being controlled by observing a thermometer inserted into the dome the most distant from the fire. The operation lasts fourteen days, and the ammonium'carbonate is then found in the domes in the form of white, translucent, fibrous crusts, which only require the removal of the surface which has been in contact with the metal. The liquid remaining in the pan receives a new charge of the crude salt, and a fresh sublimation is commenced. Uses.--Pure ammonium carbonate is used in medicine...
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