发明申请
- 专利标题: PROCESS FOR PREPARING MDA VIA THE STAGE OF THE AMINAL
- 专利标题(中): 通过氨基酸制备MDA的方法
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申请号: US13265271申请日: 2010-04-19
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公开(公告)号: US20120035396A1公开(公告)日: 2012-02-09
- 发明人: Eckhard Stroefer , Kai Thiele , Michael Zoellinger , Johnny Moors , Jon S. Speier
- 申请人: Eckhard Stroefer , Kai Thiele , Michael Zoellinger , Johnny Moors , Jon S. Speier
- 申请人地址: DE Ludwigshafen
- 专利权人: BASF SE
- 当前专利权人: BASF SE
- 当前专利权人地址: DE Ludwigshafen
- 优先权: EP09158207.2 20090420
- 国际申请: PCT/EP2010/055126 WO 20100419
- 主分类号: C07C209/78
- IPC分类号: C07C209/78 ; C07C211/55
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.
公开/授权文献
- US08710267B2 Process for preparing MDA via the stage of the aminal 公开/授权日:2014-04-29