Online Encyclopedia

C14H802 ANTHRAQUINONE

Online Encyclopedia
Originally appearing in Volume V02, Page 106 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!
C14H802 ANTHRAQUINONE, an important derivative of anthracene, first prepared in x834 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. After this treatment, the mixture is run into lead-lined vats and treated with sulphuric acid, steam is blown through the mixture in order to bring it to the boil, and the anthracene is rapidly oxidized to anthraquinone. When the oxidation is complete. the anthraquinone is separated in a filterpress, washed and heated to r 20° C. with commercial oil of vitriol, using about 22 parts of vitriol to r of anthraquinone. It is then removed to lead-lined tanks and again washed with water and dried; the product obtained contains about 95 % of anthraquinone. It may be purified by sublimation. Various synthetic processes have been used for the preparation of anthraquinone. A. Behr and W. A. v. Dorp (Ber.,1874,7,p.578) obtained orthobenzoyl benzoic acid by heating phthalic anhydride with benzene in the presence of aluminium chloride. This compound on heating with phosphoric anhydride loses water and yields anthraquinone, C6H4O ,CiH4`000Hj5~C6H4. End of Article: C14H802 ANTHRAQUINONE
[back]
ANTHRACOTHERIUM (” coal-animal,” so called from...
[next]
ANTHRAX (the Greek for " coal,” or " carbuncle," ...

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.