Allen's Commercial Organic Analysis; A Treatise on the Properties, Modes of Assaying, and Proximate Analytical Examination of the Various Organic Chemicals and Products Employed in the Arts, Manufactures, Medicine, Etc., with Volume 2

Allen's Commercial Organic Analysis; A Treatise on the Properties, Modes of Assaying, and Proximate Analytical Examination of the Various Organic Chemicals and Products Employed in the Arts, Manufactures, Medicine, Etc., with Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...are melted in a porcelain basin and intimately mixed, by stirring, with an equal weight of finely powdered caustic potash. The saponified mass, when cold, is powdered in a mortar, and intimately mixed with 3 grm. of a mixture (1 part potassium hydroxide, 2 parts lime) for every grm. of wax taken, it is then transferred to a thick-walled, pear-shaped bulb-tube, which is heated to 2500 for 2 hours. An apparatus for conducting this operation is shown in the sketch. A is an iron vessel with a lid fastened down by screws and filled with mercury. The flask R is connected, gas-tight, with a Hofmann's burette, H, for measuring the hydrogen evolved. T is a thermometer and V a temperature regulator. K is a condensing tube for mercury vapour. It is advisable that the heating at 2500 be con tinued for three hours to secure completion of the reaction, after which the flask is allowed to cool, and is broken up to liberate the residual mass, which is then powdered and extracted with petroleum spirit in a Soxhlet apparatus. The residue left on evaporation of the petroleum spirit F1g. 8. 1 Chem. Zei1., 19oo, 24, 967. 1 Bull. Soc. Chim., 1890. 3, 3. 567. 2 Chem. Zeit., 1891. 15, 799. is dried at 11o0 and weighed. The following are some results obtained by A. and P. Buisine1 in the examination of beeswax and adulterants: 1 Bull. Soc. Chim.. 1891, 3, 5, 654. If a measurement of the hydrogen is not required, the powdered mixture of saponified wax and alkali lime may be transferred to a simple boiling tube, which is closed by a rubber stopper and a short piece of bent glass tube, supported vertically in a bath of oil or melted carnauba wax, and heated to 2500 until no more gas is evolved; the temperature is then raised for a short time to 2900. Evolution of...show more

Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236783352
  • 9781236783356