Eposidation process providing low olefin oligomer by-...

Details Eposidation process providing low olefin oligomer by-... Eposidation process providing low olefin oligomer by-...

C - Chemistry, Metallurgy

07

D

260/372.3

C07D 301/19 (2006.01) C07D 303/04 (2006.01)

Patent

CA 1266052

IMPROVED EPOXIDATION PROCESS PROVIDING LOW OLEFIN OLIGOMER BY-PRODUCT FORMATION (D#80,314-F) ABSTRACT OF THE DISCLOSURE A method of preparing an epoxide compound by re- acting an olefinically unsaturated compound with an organic hydroperoxide in the presence of a molybdenum catalyst is described. The amount of alkylene oligomer by-products in the crude reactor effluent is routinely 10 ppm or less. In the case where propylene oxide is made, this translates to about 40 ppm or less on a "pure propylene oxide" basis. The very small amount of alkylene oligomer by-product can be left in the alkylene oxide product thus avoiding a costly dis- tillation step. The reaction should be conducted at a temp- erature between about 90 and 140°C, preferably 100 to 130°C. Preferably, the mole ratio of olefinically unsaturated com- pound to organic hydroperoxide is 0.9:1 to 3.0:1. It was surprisingly discovered that the method of this invention works much better with t-butyl hydroperoxide as the organic hydroperoxide than with other hydroperoxides such as cumene hydroperoxide.

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