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MELLITIC ACID (benzene hexacarboxylic...

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Originally appearing in Volume V18, Page 96 of the 1911 Encyclopedia Britannica.

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MELLITIC See also:

ACID (from the Lat. root ac-, sharp; acere, to be sour)

ACID (See also:
BENZENE, C6H6
benzene hexacarboxylic acid), C6(000H)6 , was first discovered in 1799 by M. H. See also:

Klaproth in the See also:

MINERAL

mineral honeystone, which is the See also:

ALUMINIUM (symbol Al; atomic weight 27.0)

aluminium See also:

salt of the acid. The acid may be prepared by warming honeystone with ammonium carbonate, boiling off the excess of the ammonium salt and adding See also:

AMMONIA (NH3)

ammonia to the See also:

SOLUTION (from Lat. solvere, to loosen, dissolve)

solution. The precipitated alumina is filtered off, the filtrate evaporated and the ammonium salt of the acid purified by recrystallization. The ammonium salt is then converted into the See also:

lead salt by precipitation with lead acetate and the lead salt decomposed by sulphuretted See also:

HYDROGEN [symbol H, atomic weight x-oo8 (0=16)]

hydrogen. The acid may also be prepared by the oxidation of pure See also:

CARBON (symbol C, atomic weight 12)

carbon, or of hexamethyl benzene, in the See also:

COLD (in O. Eng. cald and ceald, a word coming ultimately from a root cognate with the Lat. gelu, gelidus, and common in the Teutonic languages, which usually have two distinct forms for the substantive and the adjective, cf. Ger. Kolte, kalt, Dutch koude

cold, by alkaline See also:

POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium permanganate (F. Schulze, Ber., 1871, 4, p. 802 ; C. See also:

FRIEDEL, CHARLES (1832-1899)

Friedel and J. M. Crafts, See also:

Ann. chim. ph s., 1884 [6], t, p.

470). It crystallizes in See also:

FINE

fine silky needles and is soluble in See also:

WATER

water and See also:

ALCOHOL

alcohol. It is a very See also:

STABLE

stable See also:

compound, See also:

CHLORINE (symbol Cl, atomic weight 35`46 (0=16)

chlorine, concentrated nitric acid and hydriodic acid having no See also:

ACTION

action upon it. It is decomposed, on dry See also:

DISTILLATION (from the Lat. distillare, more correctly destillare, to drop or trickle down)

distillation, into carbon dioxide and pyromellitic acid, C10H6O3; when distilled with See also:

lime it gives carbon dioxide and benzene. See also:

Long digestion of the acid with excess of See also:

PHOSPHORUS (Gr. 4ws, light, sPEpety, to bear)

phosphorus pentachloride results in the formation of the acid chloride, C6(000I)6, which crystallizes in needles, melting at 19o° C. By See also:

HEATING

heating the ammonium salt of the acid to 150-16o° C. as long as ammonia is evolved, a mixture of Paramide (mellimide), C6 (co > NH) 3, and ammonium euchroate is obtained. The mixture may be separated by dissolving out the ammonium euchroate with water. Paramide is a See also:

white amorphous See also:

POWDER (through O. Fr. puldre, modern poudre, from Lat. pulvis, pulveris, dust)

powder, insoluble in water and alcohol.

End of Article: MELLITIC ACID (benzene hexacarboxylic acid), C6(000H)6

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