Image from page 364 of "Practical methods of organic chemistry" (1901) (14748649966)

Identifier: practicalmethods00gatt

Title: Practical methods of organic chemistry

Year: 1901 (1900s)

Authors: Gattemann, Ludwig. [from old catalog]

Subjects:

Publisher: [n.p.]

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

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Fig. 84. Fig. 85. Hydrochloric acid gas may also be obtained by warming 10parts of sodium chloride with a cold mixture of 3 parts of waterand 18 parts of concentrated sulphuric acid. 3. HYDROBROMIC ACID (see Brombenzene) The hydrobromic acid obtained as a by-product in the bromina-tion reactions is purified by distilling it from a fractionating flask.Water first passes over until finally the temperature remains con-stant at 12 6°, when a 48 % acid goes over; this is collected. In order to prepare potassium bromide for use in the prepara-tion of ethyl bromide, the acid is diluted with some water andthen treated with dry potash until there is no further evolution ofcarbon dioxide and the liquid shows a neutral reaction. To1 part of hydrobromic acid 0.5 part potassium carbonate is used.The water solution of the potassium bromide is evaporated to dry-ness on a water-bath. The product thus obtained may be useddirectly for the preparation of ethyl bromide. 4. HYDRICDIC ACID To 44 grammes o

Praktische Methoden der organischen Chemie 1901 Buchillustrationen Bilder aus dem Internetarchiv Kongressbibliothek

1901

Library of Congress

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