PROCESS FOR PREPARING MDA VIA THE STAGE OF THE AMINAL
    3.
    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

    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.

    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 methylenedi(phenyl isocyanate)
    6.
    发明授权
    Process for preparing methylenedi(phenyl isocyanate) 有权
    亚甲基二(异氰酸苯酯)

    公开(公告)号:US08907124B2

    公开(公告)日:2014-12-09

    申请号:US13299039

    申请日:2011-11-17

    摘要: The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c).

    摘要翻译: 本发明涉及一种制备亚甲基二(苯基异氰酸酯)的方法,其包括(a)双环和/或多种亚甲基二苯胺(苯胺)的光气化,(b)将得到的粗亚甲基二(苯基异氰酸酯) (c)纯化和/或分馏得到的亚甲基二异氰酸酯(苯基异氰酸酯)的双环异构体的混合物和(d)在步骤(c)或步骤(c)中获得的混合物的储存 b),其中部分储存的混合物通过在步骤(b)或(c)中的至少一个中的循环再利用。

    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

    IPC分类号: C07C211/00 C09B11/02

    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。

    PROCESS FOR PREPARING METHYLENEDI(PHENYL ISOCYANATE)
    9.
    发明申请
    PROCESS FOR PREPARING METHYLENEDI(PHENYL ISOCYANATE) 有权
    制备亚甲基(异氰酸苯酯)的方法

    公开(公告)号:US20120123151A1

    公开(公告)日:2012-05-17

    申请号:US13299039

    申请日:2011-11-17

    IPC分类号: C07C263/10

    摘要: The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c).

    摘要翻译: 本发明涉及一种制备亚甲基二(苯基异氰酸酯)的方法,其包括(a)双环和/或多种亚甲基二苯胺(苯胺)的光气化,(b)将得到的粗亚甲基二(苯基异氰酸酯) (c)纯化和/或分馏得到的亚甲基二异氰酸酯(苯基异氰酸酯)的双环异构体的混合物和(d)将步骤(c)中获得的混合物或步骤( b),其中部分储存的混合物通过在步骤(b)或(c)中的至少一个中的循环再利用。