1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ANTHRAQUINONE, CuHsOi, an important derivative of anthracene, first prepared in 1834 by A. Laurent. It is prepared commercially from anthracene by stirring a sludge of anthracene and water in horizontal cylinders with a mixture of sodium bichromate and caustic soda. This suspension is then run through a conical mill in order to remove all grit, the cones of the mill fitting so tightly that water cannot pass through unless the mill is running; the speed of the mill when working is about 3000 revolutions per minute. …
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- Vol. 2, pp. 106-106