1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ANTHRACENE (from the Greek a»0pa£, coal), C,4H,0, a hydrocarbon obtained from the fraction of the coal-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 machine, the low melting-point impurities are removed by means of hot water, and the residue is finally hot-pressed. The crude anthracene cake is purified by treatment with the higher pyridine bases, the operation being carried out in larg…
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- Vol. 2, pp. 105-105