公开(公告)号：US4008275A

公开(公告)日：1977-02-15

申请号：US605752

申请日：1975-08-18

申请人： Adnan A. R. Sayigh ,  Kwok K. Sun ,  Henri Ulrich

发明人： Adnan A. R. Sayigh ,  Kwok K. Sun ,  Henri Ulrich

IPC分类号： C07C85/26

CPC分类号： C07C209/78

摘要： 2,2'- AND 2,4'-DIAMINODIPHENYLMETHANE ARE SELECTIVELY REMOVED FROM ADMIXTURES THEREOF WITH THE 4,4'-ISOMER BY HEATING THE ISOMER MIXTURE AT 30.degree. TO 100.degree. C in the presence of styrene, .alpha.-alkylstyrenes, or the mono- or diamino nuclear substituted derivatives thereof and a catalyst (mineral acid, clays, diatomaceous earth, zeolites). The styrene or .alpha.-alkylstyrene can be employed as such or generated in situ from a precursor therefor. The process is particularly useful in facilitating the isolation of substantially pure 4,4'-diaminodiphenylmethane from the polyamine mixture obtained by condensation of aniline and formaldehyde.

摘要翻译： 通过在苯乙烯，α-烷基苯乙烯存在下，在30℃至100℃下加热异构体混合物，可以从4,4'-异构体的形式中选择性地除去2,2'-和2,4'-二氨基二苯基甲烷。 单 - 或二氨基核取代衍生物和催化剂（无机酸，粘土，硅藻土，沸石）。 苯乙烯或α-烷基苯乙烯可以原样使用或从其前体原位产生。 该方法特别有助于从通过苯胺和甲醛的缩合得到的多胺混合物中分离出基本上纯的4,4'-二氨基二苯基甲烷。