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    Preparation of phenol and its derivatives
    7.
    发明授权
    Preparation of phenol and its derivatives 失效
    苯酚及其衍生物的制备

    公开(公告)号：US06414197B1

    公开(公告)日：2002-07-02

    申请号：US09078253

    申请日：1998-05-13

    申请人： Leonid Modestovich Kustov ,  Viktor Ignatyevich Bogdan ,  Vladimir Borisovich Kazansky

    发明人： Leonid Modestovich Kustov ,  Viktor Ignatyevich Bogdan ,  Vladimir Borisovich Kazansky

    IPC分类号： C07C3902

    CPC分类号： C07C37/60 ,  B01J29/40 ,  B01J2229/26 ,  B01J2229/36 ,  B01J2229/42 ,  Y02P20/52 ,  C07C39/04 ,  C07C39/27 ,  C07C39/07 ,  C07C39/06

    摘要： A method and a catalyst are described for selective oxidation of aromatic compounds (e.g., benzene and its derivatives) into hydroxylated aromatic compounds (e.g., corresponding phenols). For example, benzene can be converted into phenol with a yield of at least 30-40%, and a selectivity on the basis of benzene of at least 95-97%. The selectivity for this reaction based on N2O is at least 90-95%. Therefore, no substantial N2O decomposition or consumption for complete benzene oxidation to CO+CO2 or other side products occurs. Similar results are obtained with benzene derivatives (e.g., fluorobenzene, difluorobenzene, phenol), although the selectivity is somewhat lower in the case of derivatives (e.g., about 80-85% in the case of fluorosubstituted benzenes). A preferred catalyst for this process is a composition containing a high-silica pentasil-type zeolite (e.g, an HZSM-5 type zeolite) which contains no purposefully introduced additives such as transition or noble metals. The catalytic effect is achieved by performing a specific zeolite modification with strong Lewis acid-base centers of a specific nature. This modification can be achieved by a pretreatment comprising two steps: a first conventional calcination step at 300-600° C., and a second high-temperature calcination step at 600-950° C.

    摘要翻译： 描述了将芳族化合物（例如苯及其衍生物）选择性氧化成羟基化芳族化合物（例如相应的酚）的方法和催化剂。 例如，苯可以转化成苯酚，产率至少为30-40％，苯的选择性至少为95-97％。 基于N2O的该反应的选择性为至少90-95％。 因此，不会发生完全苯氧化成CO + CO2或其他副产物的大量N2O分解或消耗。 尽管在衍生物的情况下选择性略低（例如在氟取代的苯的情况下为约80-85％），但苯衍生物（例如，氟苯，二氟苯，苯酚）也可得到类似的结果。 用于该方法的优选催化剂是含有不需要有目的地引入的添加剂如过渡金属或贵金属的高二氧化硅pentasil型沸石（例如，HZSM-5型沸石）的组合物。 通过用特定性质的强路易斯酸碱中心进行具体的沸石改性来实现催化效果。 该改性可以通过包括两个步骤的预处理来实现：在300-600℃下进行第一常规煅烧步骤，在600-950℃进行第二高温煅烧步骤。