A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . r than 180° or 190. If the benzole is wantedabsolutely free from its accompanying hydrocarbons, it must be purified by freezing. Forthis purpose the rectified benzole is to be placed in a thin glass or metal vessel, and sur-rounded with snow or pounded ice mixed with salt. The whole apparatus is to be surround-ed with sawdust and covered with woollen cloths to prevent access of heat. As soon as thebenzole is frozen, it is to be placed in a funnel and allowed to
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . r than 180° or 190. If the benzole is wantedabsolutely free from its accompanying hydrocarbons, it must be purified by freezing. Forthis purpose the rectified benzole is to be placed in a thin glass or metal vessel, and sur-rounded with snow or pounded ice mixed with salt. The whole apparatus is to be surround-ed with sawdust and covered with woollen cloths to prevent access of heat. As soon as thebenzole is frozen, it is to be placed in a funnel and allowed to drain. The solid mass whenthawed is pure benzole. By this mode of proceeding, a considerable quantity of fluid isalways accumulated which refuses to freeze and yet boils at the proper temperature forbenzole. I have found it to contain a small quantity of the C!! series of hydrocarbons(homologous with olefiant gas). Mr. Church states it to contain benzole in a peculiar con-dition ; he calls it parabenzole. The presence of the C!! series may always be proved bythe readiness with which the fluid decolorizes bromine water. 464 465.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
