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    • 5. 发明授权
    • Catalytic hydrogenation of crude methylene bridged polyphenylamines to
produce polycyclohexylamines
    • 粗亚甲基桥联聚苯胺的催化氢化生产聚环己胺
    • US5196587A
    • 1993-03-23
    • US699425
    • 1991-05-13
    • Gamini A. VedageWilliam W. HendersonBernard A. Toseland
    • Gamini A. VedageWilliam W. HendersonBernard A. Toseland
    • C07C209/72
    • C07C209/72C07C2101/14
    • This invention relates to an improved process for the catalytic hydrogenation of methylene bridged polyphenylamines using rhodium as th e catalyst to produce the methylene bridged polycyclohexylamine counterparts. The improvement for hydrogenating crude methylene bridged polyphenylamines containing polyphenylamine oligomers and trace amounts of impurities, such as the formamide of the methylene bridged polyphenylamines, comprises contacting the crude polyphenylamine feed with a hydrogenation catalyst, other than rhodium, and one which is not a catalyst poison to rhodium, under conditions sufficient to at least partially hydrogenate the polyphenylamine mixture and then effecting hydrogenation of the methylene bridged polyphenylamine to the polycyclohexylamine counterpart in the presence of a rhodium catalyst. The pretreatment of the crude methylene bridged polyphenylamine feed apparently destroys the formamide derivatives and possibly other trace impurities in the mixture and thereby prevents rapid deactivation of the rhodium catalyst during hydrogenation of the aromatic ring.
    • 本发明涉及使用铑作为催化剂催化氢化亚甲基桥连聚苯胺以制备亚甲基桥连的聚环己胺对应物的改进方法。 用于氢化含有聚苯胺低聚物和微量杂质的亚甲基桥联聚苯胺的改进,例如亚甲基桥接的聚苯胺的甲酰胺的改进包括使粗多胺进料与除铑之外的氢化催化剂和不是催化剂毒物 在足以使聚苯胺混合物至少部分氢化,然后在铑催化剂存在下将亚甲基桥接的聚苯胺氢化为多环己胺的对照物的条件下,加入铑。 粗亚甲基桥接的聚苯胺进料的预处理明显地破坏了混合物中的甲酰胺衍生物和可能的其它微量杂质,从而防止了芳族环加氢期间铑催化剂的快速失活。