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    PROCESS FOR PREPARING MDA VIA THE STAGE OF THE AMINAL
    7.
    发明申请
    PROCESS FOR PREPARING MDA VIA THE STAGE OF THE AMINAL 失效
    通过氨基酸制备MDA的方法

    公开(公告)号：US20120035396A1

    公开(公告)日：2012-02-09

    申请号：US13265271

    申请日：2010-04-19

    申请人： Eckhard Stroefer ,  Kai Thiele ,  Michael Zoellinger ,  Johnny Moors ,  Jon S. Speier

    发明人： Eckhard Stroefer ,  Kai Thiele ,  Michael Zoellinger ,  Johnny Moors ,  Jon S. Speier

    IPC分类号： C07C209/78 ,  C07C211/55

    CPC分类号： C07C209/78 ,  C07C209/62 ,  C07C211/50

    摘要： The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c): a) converting formaldehyde and aniline to aminal b) removing water from the aminal obtained in step a) to establish a water content of 0 to 5% by weight based on the aminal, and c) adding an acidic catalyst to the aminal having a water content of 0 to 5% by weight, which comprises using formaldehyde in step a) in the form of highly concentrated formaldehyde with a CH2O content of >50% by weight and preparing the formaldehyde by oxidative dehydrogenation from methanol.

    摘要翻译： 本发明涉及一种制备亚甲基二苯基二胺（MDA）的方法，包括以下步骤a）至c）：a）将甲醛和苯胺转化成缩醛; b）从步骤a）中获得的阿米尔液中除去水，以确定含水量为0 至5重量％，以及c）向具有0-5重量％水含量的氨基酸中加入酸性催化剂，其包括在步骤a）中使用甲醛以高浓度甲醛与CH 2 O形式 含量> 50重量％，并通过甲醇氧化脱氢制备甲醛。

    Process for preparing MDA via the stage of the aminal
    8.
    发明授权
    Process for preparing MDA via the stage of the aminal 失效
    通过阿片剂制备MDA的方法

    公开(公告)号：US08710267B2

    公开(公告)日：2014-04-29

    申请号：US13265271

    申请日：2010-04-19

    申请人： Eckhard Stroefer ,  Kai Thiele ,  Michael Zoellinger ,  Johnny Moors ,  Jon S. Speier

    发明人： Eckhard Stroefer ,  Kai Thiele ,  Michael Zoellinger ,  Johnny Moors ,  Jon S. Speier

    IPC分类号： C07C211/00 ,  C09B11/02

    CPC分类号： C07C209/78 ,  C07C209/62 ,  C07C211/50

    摘要： The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c): a) converting formaldehyde and aniline to aminal b) removing water from the aminal obtained in step a) to establish a water content of 0 to 5% by weight based on the aminal, and c) adding an acidic catalyst to the aminal having a water content of 0 to 5% by weight, which comprises using formaldehyde in step a) in the form of highly concentrated formaldehyde with a CH2O content of >50% by weight and preparing the formaldehyde by oxidative dehydrogenation from methanol.

    摘要翻译： 本发明涉及一种制备亚甲基二苯基二胺（MDA）的方法，包括以下步骤a）至c）：a）将甲醛和苯胺转化为缩醛; b）从步骤a）中获得的阿米尔液中除去水，以确定含水量为0 至5重量％，以及c）向具有0-5重量％水含量的氨基酸中加入酸性催化剂，其包括在步骤a）中使用甲醛以高浓度甲醛与CH 2 O形式 含量> 50重量％，并通过甲醇氧化脱氢制备甲醛。