METHOD OF 2-METHYL-1,4-NAPTHOQUINONE OBTAINING Russian patent published in 2009 - IPC C07C50/12 C07C46/04 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining 2-ethyl-1,4-napthoquinone (menadione, vitamin K₃), which is widely applied in medical practice and livestock breeding, especially in poultry breeding, as preparation for improvement of blood clotting. Method consists in oxidation of 2-methylnapthtaline with hexavalent chrome compounds in acid medium at heating. As compounds of hexavalent chrome applied is chrome-containing waste electrolyte with content of hexavalent chrome 150-500 g/l in terms of CrO₃, which in form of mixture with sulfuric or acetous acid is slowly added to preliminarily heated to 35-40°C 2-methylnaphtholine, and then temperature of reaction mass is increased to 70-90°C.

EFFECT: obtaining target product with high conversion and higher output when using production wastes.

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