METHOD OF PREPARING MOLYBDENUM-CONTAINING CATALYST FOR EPOXIDATION OF OLEFINS Russian patent published in 2005 - IPC

FIELD: organic synthesis catalysts.

SUBSTANCE: invention, in particular, concerns preparation of catalyst soluble in reaction medium, which is efficient in reactions of epoxidation of olefins by organic hydroperoxides. Preparation of catalyst comprises providing water-ammonia solution of ammonium molybdate, bringing it into reaction with C₂-C₈-alkanediol, and distilling away aqueous ammonia and excess diol followed by modifying resulting catalyst with nitrogen-containing organic compound, which is introduced into catalyst in aliphatic C₃-C₄-alcohol solution at molar ratio of nitrogen-containing organic compound to molybdenum compound (1-10):1. Nitrogen-containing organic compound is selected from diamines of general formula R¹NHR²NHR³, where R¹ is phenyl, C₆-cycloalkyl, naphthyl, or diphenylamine, R² is C₁-C₂-alkylene, C₆-C₈-arylene, or -C(=NH)-, and R³ is isopropyl, phenyl, naphthyl or diphenylamine; aminophenols of general formula R⁴R⁵R⁶N, where R⁴ is hydroxynaphthyl or 4-hydroxy-3,5-di-tert-butylbenzyl, R⁵ is hydrogen, C¹-C²-alkyl, or phenyl, and R⁶ is methyl or 4-hydroxy-3,5-di-tert-butylbenzyl; and stable nitroxyl radical 2,2,6,6-tetramethylpyperidine-1-oxyl. Method allows: preparation of molybdenum-containing catalyst showing high activity and selectivity in reaction of hydroperoxide epoxidation of olefins, including low-reactive ones, e.g. propylene; simplification of technology due to use of commercially available organic nitrogen-containing compounds, so that additional synthesis stages can be avoided; and use of ammonium molybdate obtained during regeneration of molybdenum-containing epoxidation catalyst.

EFFECT: increased catalyst preparation efficiency and increased activity and selectivity of catalyst.

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