Epoxidation using hydrogen peroxide and tungsten catalysts

Details Epoxidation using hydrogen peroxide and tungsten catalysts Epoxidation using hydrogen peroxide and tungsten catalysts

B - Operations, Transporting

01

J

B01J 27/188 (2006.01) B01J 23/30 (2006.01) B01J 31/06 (2006.01) B01J 31/34 (2006.01) C07D 301/12 (2006.01) C07D 303/04 (2006.01) C07J 71/00 (2006.01)

Patent

CA 2111696

2111696 9300338 PCTABS00019 Alkenes can be epoxidised with hydrogen peroxide using a homogeneous heavy metal catalyst, but discharge of spent reaction mixtures releases the heavy metal in the environment. The problem can be ameliorated by selecting a heterogeneous catalyst system comprising a tungsten-containing heteropolyacid supported on selected Group IIa, IIb, IIIb, IVa or IVb inorganic supports or on a strong basic resin, which catalyst has either been calcined after impregnation or in the impregnation stage an alcoholic solution of the heteropolyacid is employed and by employing a nitrilo or oxygenated polar solvent reaction medium. A number of preferred heteropolyacids satisfy the empirical formula M3/nPWwMO12-wO40 in which w represents an integer of at least 1, M represents a counterion and n its basicity. Preferred supports include activated alumina, calcined at 400 to 600· C and cross-linked quaternary ammonium-substituted polystyrene resins. The most preferred catalysts are made by impregnating an inorganic support with a methanol solution of the heteropolyacid to a desired loading of active material on the support and subsequently calcining the loaded support at 400 to 600· C. Preferred reaction media include acetonitrile and tertiary butanol.

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