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    • 92. 发明授权
    • Integrated process for the preparation of phenol from benzene with recycling of the by-products
    • 从苯中制备苯酚的副产物回收综合工艺
    • US07038093B2
    • 2006-05-02
    • US10716460
    • 2003-11-20
    • Daniele BianchiRossella BortoloRoberto BuzzoniAlberto CesanaLeonardo DalloroRino D'Aloisio
    • Daniele BianchiRossella BortoloRoberto BuzzoniAlberto CesanaLeonardo DalloroRino D'Aloisio
    • C07C37/00
    • C07C37/60B01J29/89B01J2229/30Y02P20/125Y02P20/52C07C39/04
    • The invention relates to a process for the preparation of phenol comprising the following phases: 1) preparation in continuous of phenol by means of the direct oxidation of benzene with hydrogen peroxide operating with an H2O2/benzene ratio ranging from 10 to 70%, in a three-phase reaction system comprising a first liquid phase consisting of benzene and an organic solvent, a second liquid phase consisting of water, a solid phase consisting of an activated catalyst based on titanium silicalite TS-1; 2) separation of the phenol and non-reacted benzene from the reaction mixture of the oxidation section (1), by means of fractionated distillation; 3) separation of the solvent and by-products from the mixture coming from the distillation tail (2), by means of basic extraction; 4) transformation of the by-products obtain in section (3) to phenol by means of hydrodeoxygenation with hydrogen operating in continuous, in aqueous solution, at a temperature ranging from 250 to 500° C., at pressures of 1-100 bar and in the presence of a catalyst based on elements of group VIB or their mixtures or group VIII of the periodic table or their mixtures; 5) recycling of the phenol obtained in section (4) to the distillation section (2).
    • 本发明涉及一种制备苯酚的方法,包括以下阶段:1)通过苯与氧化氢的直接氧化制备苯酚连续操作,所述过氧化氢用H 2 O 2 在含有由苯和有机溶剂组成的第一液相的三相反应体系中,第二液相由水组成,固相由活化的 基于钛硅沸石TS-1的催化剂; 2)通过分级蒸馏从氧化段(1)的反应混合物中分离苯酚和未反应的苯; 3)通过碱性萃取法从蒸馏尾料(2)中分离出溶剂和副产物与混合物; 4)将第(3)部分获得的副产物转化为苯酚,通过加氢脱氧,氢气在连续的水溶液中,在250-500℃的温度,1-100巴的压力和 在基于元素周期表VIB族元素或它们的混合物或VIII族元素或其混合物的催化剂的存在下; 5)将第(4)节中得到的酚再循环至蒸馏段(2)。