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    PROCESS FOR PREPARING METHYLENEDIPHENYL DIISOCYANATES
    8.
    发明申请
    PROCESS FOR PREPARING METHYLENEDIPHENYL DIISOCYANATES 有权
    制备亚甲基二苯甲酸酯的方法

    公开(公告)号：US20090240076A1

    公开(公告)日：2009-09-24

    申请号：US12394149

    申请日：2009-02-27

    申请人： Fritz Pohl ,  Andreas Bulan ,  Rainer Weber ,  Richard Adamson ,  Matthias Bohm ,  Christian Six

    发明人： Fritz Pohl ,  Andreas Bulan ,  Rainer Weber ,  Richard Adamson ,  Matthias Bohm ,  Christian Six

    IPC分类号： C07C263/10 ,  C25B1/34

    CPC分类号： C25B15/08 ,  C07C209/78 ,  C07C263/10 ,  C25B1/26 ,  C07C211/50 ,  C07C265/14

    摘要： The invention relates to a process for preparing methylenediphenyl diisocyanates which comprises at least the steps: A) reaction of aniline with formaldehyde in the presence of hydrochloric acid as catalyst to give a mixture of diamines and polyamines of the diphenylmethane series (MDA) and subsequent at least partial neutralization of the hydrochloric acid by means of alkali metal hydroxide, B) reaction of the mixture of diamines and polyamines of the diphenylmethane series obtained in step A) with phosgene to give a mixture of diisocyanates and polyisocyanates of the diphenylmethane series (MDI) and hydrogen chloride, wherein C) the hydrochloric acid which has been neutralized in step A) is separated off in the form of a solution containing alkali metal chloride and is subsequently at least partly fed to an electrochemical oxidation to form chlorine, alkali metal hydroxide and optionally hydrogen and D) at least part of the chlorine produced in step C) is used for preparing the phosgene used in step B).

    摘要翻译： 本发明涉及一种制备亚甲基二苯基二异氰酸酯的方法，其至少包括以下步骤：A）在盐酸作为催化剂存在下苯胺与甲醛的反应，得到二苯基甲烷系列（MDA）的二胺和多胺的混合物， 通过碱金属氢氧化物最小程度地中和盐酸，B）将步骤A）中得到的二苯基甲烷系列的二胺和多胺的混合物与光气反应，得到二苯基甲烷系列（MDI）的二异氰酸酯和多异氰酸酯的混合物， 和氯化氢，其中C）在步骤A）中已中和的盐酸以含有碱金属氯化物的溶液的形式分离，随后至少部分地进料至电化学氧化以形成氯，碱金属氢氧化物和 任选地氢和D）步骤C）中产生的至少一部分氯用于制备磷 在步骤B）中使用的烯。

    Process for preparing methylenediphenyl diisocyanates
    10.
    发明授权
    Process for preparing methylenediphenyl diisocyanates 有权
    亚甲基二苯基二异氰酸酯的制备方法

    公开(公告)号：US08318971B2

    公开(公告)日：2012-11-27

    申请号：US12394149

    申请日：2009-02-27

    申请人： Fritz Pohl ,  Andreas Bulan ,  Rainer Weber ,  Richard Adamson ,  Matthias Böhm ,  Christian Six

    发明人： Fritz Pohl ,  Andreas Bulan ,  Rainer Weber ,  Richard Adamson ,  Matthias Böhm ,  Christian Six

    IPC分类号： C07C249/00

    CPC分类号： C25B15/08 ,  C07C209/78 ,  C07C263/10 ,  C25B1/26 ,  C07C211/50 ,  C07C265/14

    摘要： The invention relates to a process for preparing methylenediphenyl diisocyanates which comprises at least the steps: A) reaction of aniline with formaldehyde in the presence of hydrochloric acid as catalyst to give a mixture of diamines and polyamines of the diphenylmethane series (MDA) and subsequent at least partial neutralization of the hydrochloric acid by means of alkali metal hydroxide, B) reaction of the mixture of diamines and polyamines of the diphenylmethane series obtained in step A) with phosgene to give a mixture of diisocyanates and polyisocyanates of the diphenylmethane series (MDI) and hydrogen chloride, wherein C) the hydrochloric acid which has been neutralized in step A) is separated off in the form of a solution containing alkali metal chloride and is subsequently at least partly fed to an electrochemical oxidation to form chlorine, alkali metal hydroxide and optionally hydrogen and D) at least part of the chlorine produced in step C) is used for preparing the phosgene used in step B).

    摘要翻译： 本发明涉及一种制备亚甲基二苯基二异氰酸酯的方法，其至少包括以下步骤：A）在盐酸作为催化剂存在下苯胺与甲醛的反应，得到二苯基甲烷系列（MDA）的二胺和多胺的混合物， 通过碱金属氢氧化物最小程度地中和盐酸，B）将步骤A）中得到的二苯基甲烷系列的二胺和多胺的混合物与光气反应，得到二苯基甲烷系列（MDI）的二异氰酸酯和多异氰酸酯的混合物， 和氯化氢，其中C）在步骤A）中已中和的盐酸以含有碱金属氯化物的溶液的形式分离，随后至少部分地进料至电化学氧化以形成氯，碱金属氢氧化物和 任选地氢和D）步骤C）中产生的至少一部分氯用于制备磷 在步骤B）中使用的烯。