| 摘要 |
1,133,313. Coproduction of epoxides and styrenes. HALCON INTERNATIONAL Inc. 24 Nov., 1965 [30 Nov., 1964], No. 49907/65. Addition to 1,097,132. Heading C2C. [Also in Division C5] In a process for the co-production of an epoxide and a styrene, an alpha-aralkyl hydroperoxide, having at least one hydrogen atom attached to a carbon atom adjacent to the carbon atom of the hydroperoxy group, is reacted in the liquid phase with a C 2-30 olefinically unsaturated compound, which has a different carbon skeleton from that of the hydroperoxide, in the presence of a Ti, Ta, Se, Te, Nb, Cr, Zn, U or Re catalyst to produce an epoxide and an alpha-aralkyl alcohol corresponding to the hydroperoxide and said alcohol is separated and dehydrated to the corresponding alcohol. The aralkyl hydroperoxides may be obtained by oxidation of the appropriate aralkanes, e.g. cumene and ethylbenzene. Epoxidation may be effected at - 20‹ to 200‹ C. in the presence of an inert solvent using a catalyst which is soluble in the reaction medium. After epoxidation, the reaction mixture may be distilled to remove unreacted olefin and the residue hydrogenated to reduce unreacted hydroperoxide to alcohol and subsequently distilled to remove the epoxide product, the residue being dehydrated to produce a styrene (see Division C5). Examples relate to the preparation of propylene oxide and cyclohexene oxide. |
