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    PROCESS FOR SEPARATING AN ISOCYANATE PREPARED BY PHOSGENATION OF A PRIMARY AMINE IN THE GAS PHASE FROM THE GASEOUS CRUDE PRODUCT OF THE PHOSGENATION
    1.
    发明申请
    PROCESS FOR SEPARATING AN ISOCYANATE PREPARED BY PHOSGENATION OF A PRIMARY AMINE IN THE GAS PHASE FROM THE GASEOUS CRUDE PRODUCT OF THE PHOSGENATION 有权
    用于分离由PHOSGENATION的气体原料产生的气相中主要胺类化合物制备的异氰酸酯的方法

    公开(公告)号：US20150368190A1

    公开(公告)日：2015-12-24

    申请号：US14765870

    申请日：2014-02-05

    Applicant: BAYER MATERIALSCIENCE AG

    Inventor： Friedhelm STEFFENS ,  Bastian Mahr

    IPC: C07C263/20 ,  B01D3/00

    CPC classification number: C07C263/20 ,  B01D3/009 ,  C07C253/00 ,  C07C263/18 ,  C07C265/14

    Abstract: The present invention relates to a process for separating an isocyanate prepared by reaction of a primary amine with an excess of phosgene in the gas phase from the gaseous crude product obtained in the reaction, wherein (i) the gaseous crude product is partially liquefied by contacting with a quenching liquid, (ii) the gas phase obtained in step (i) is partially condensed, (iii) the condensate obtained in step (ii) is used as the quenching liquid in step (i), (iv) the portions of the gas phase that were not condensed in step (ii) are at least partially liquefied, (v) the liquid phase obtained in step (iv) is likewise used as the quenching liquid in step (i), and (vi) the liquid phase obtained in step (i) is worked up to the pure isocyanate without previously being used as quenching liquid.

    Abstract translation: 本发明涉及通过在气相中由伯胺与过量的光气反应制备的异氰酸酯的方法，该方法是从反应中得到的气态粗产物中分离，其中（i）气态粗产物通过接触部分液化 使用骤冷液体，（ii）步骤（i）中获得的气相部分冷凝，（iii）将步骤（ii）中得到的冷凝物用作步骤（i），（iv）中的骤冷液， 在步骤（ii）中未冷凝的气相至少部分液化，（v）步骤（iv）中获得的液相同样用作步骤（i）中的骤冷液，和（vi）液相 将步骤（i）中得到的物质除去预先用作骤冷液的方式处理至纯异氰酸酯。

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