| 摘要 |
Integrated epoxide prodn. comprises: (a) contacting a liq. aliphatic sec. alcohol, pref. isopropanol or sec.-butanol, with O2 at 50-200[deg]C to form an oxidant mixt. contg. 40-90 wt.% aliphatic sec. alcohol, 5-35 wt.% corresp. aliphatic ketone, 1-20 wt.% H2O2 and 0-35 wt.% water; (b) sepg. the ketone from the oxidant mixt. to provide an H2O2-contg. stream also contg. sec. alcohol, 1 wt.% ketone and 0.5 wt.% aliphatic ketone peroxides; (c) reacting the sepd. ketone with H2 over a heterogeneous hydrogenation catalyst comprising a transition metal comprising Pd, Pt, Ru, Cr, Rh or Ni, at 20-175[deg]C and an H2 pressure of 0.5-100 atmos. to convert the ketone to the sec. alcohol and recycling at least a part of the sec. alcohol for use in step (a); (d) contacting the H2O2-contg. stream with an ethylenically unsatd. substrate and a Ti-silicate catalyst at 40-120[deg]C using a molar ratio of substrate:H2O2 of 1-10:2-1, to form an epoxidation reaction mixt., contg. aliphatic sec. alcohol, epoxide and water, and (e) sepg. the sec. alcohol from the epoxidation mixt. and recycling at least a part of it for use in step (a). Also claimed is an integrated process for prodn. of propylene oxide. The ethylenically unsatd. substrate is pref. a 2-10C olefin and the aliphatic sec. olefin is pref. isopropanol. The process is pref. continuous and the Ti-silicate is pref. in the form of a fixed bed or slurry. The T silicate has an MFL, MEL, or zeolite beta topology and is of formula xTiO2:(1-x)SiO2 (I), where x = 0.01-0.125. |
