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ANTHRACENE (from the Greek avOpa, coal)

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Originally appearing in Volume V02, Page 105 of the 1911 Encyclopedia Britannica.
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ANTHRACENE (from the See also:Greek avOpa, See also:coal) , Cr4H1o, a See also:hydrocarbon obtained from the fraction of the coal-See also:tar distillate boiling between 270° and 400° C. This high boiling fraction is allowed to stand for some days, when it partially solidifies. It is then separated in a centrifugal See also:machine, the See also:low melting-point impurities are removed by means of hot See also:water, and the See also:residue is finally hot-pressed. The crude anthracene cake is purified by treatment with the higher See also:pyridine bases, the operation being carried out in large See also:steam-jacketed boilers. The whole See also:mass dissolves on See also:heating, and the anthracene crystallizes out on cooling. The crystallized anthracene is then removed by a centrifugal separator and the See also:process of See also:solution in the pyridine bases is repeated. Finally the anthracene is purified by sublimation. Many synthetical processes for the preparation of anthracene and its derivatives are known. It is formed by the condensation of See also:acetylene tetrabromide with See also:benzene in the presence of See also:aluminium chloride: Br•CH•Br See also:C6H6+ I +C6H6=4HBr+C6H4K. I 4H4, Br•CH•Br and similarly from methylene dibromide and benzene, and also when benzyl chloride is heated with aluminium chloride to 200° C. By condensing ortho-brombenzyl bromide with See also:sodium, C. L.

See also:

Jackson and J. F. See also:White (Ber., 1879, 12, p.

End of Article: ANTHRACENE (from the Greek avOpa, coal)

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