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mellitic acid
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Mellitic acid, also called graphitic acid or benzenehexacarboxylic acid, is an acid first discovered in 1799 by M. H. Klaproth in the mineral mellite (honeystone), which is the aluminium salt of the acid.
== Preparation ==
Mellitic acid may be prepared by warming mellite with ammonium carbonate, boiling off the excess of the ammonium salt, and adding ammonia to the 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 lead salt by precipitation with lead acetate, and the lead salt is then decomposed by hydrogen sulfide. The acid may also be prepared by the oxidation of pure carbon or hexamethyl benzene, by alkaline potassium permanganate in the cold, or by hot concentrated nitric acid.〔(WebElements.com )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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