| 摘要 |
A process for preparing an alkylene oxide, which process comprises: (i) oxidizing an alkylbenzene to obtain a stream comprising alkylbenzene hydroperoxide, (ii) contacting at least part of the alkylbenzene hydroperoxide obtained in step (i) with an olefin to obtain a product stream comprising an alkylene oxide (iii) separating alkylene oxide compound from the product stream of step (ii) to obtain (a) a residual product stream comprising alkylphenyl alcohol, and (b) alkylene oxide, (iv) feeding at least a part of the residual product stream comprising alkylphenyl alcohol to a reactor having a catalytic distillation zone, and concurrently in the reactor, (a) contacting the residual product stream comprising alkylphenyl alcohol with hydrogen in the catalytic distillation zone to convert the alkylphenyl alcohol in the residual product stream to alkylbenzene and form a reaction mixture, and (b) separating alkylbenzene from the reaction mixture by fractional distillation, (v) withdrawing a stream comprising alkylbenzene and having a reduced concentration of alkylphenyl alcohol than the feed stream from the reactor at a position upper from the catalytic reaction zone; (vi) withdrawing from the reactor at a position lower than the catalytic distillation zone a bottom stream comprising dimer(s) of alkylbenzene; (vii) converting the dimer(s) of alkylbenzene in the bottom stream from (vi) to alkylbenzene; and (viii) recycle at least a part of the alkylbenzene produced from (iv)(b) and/or (vi) to step (i). |
