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    Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification
    5.
    发明授权
    Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification 有权
    用于纯化含有分隔壁蒸馏塔用于最终纯化的甲苯二异氰酸酯的方法

    公开(公告)号：US07108770B2

    公开(公告)日：2006-09-19

    申请号：US10687157

    申请日：2003-10-16

    申请人： Marcus Paul Grün ,  Bill Brady, Jr. ,  Berthold Keggenhoff ,  Kai Verkerk ,  Hans-Peter Schal

    发明人： Marcus Paul Grün ,  Bill Brady, Jr. ,  Berthold Keggenhoff ,  Kai Verkerk ,  Hans-Peter Schal

    IPC分类号： B01D3/14 ,  C07C263/10 ,  C07C263/20 ,  C07C265/10

    CPC分类号： C07C263/10 ,  C07C263/20 ,  Y10S203/11 ,  C07C265/14

    摘要： Toluene diisocyanate is recovered from a crude distillation feed containing less than 2% by weight of phosgene by(a) fractionating the crude distillation feed containing less than 2% by weight of phosgene to remove the solvent and optionally the reaction residues to produce a crude toluene diisocyanate feed containing less than 20% by weight of solvent and(b) separating the crude toluene diisocyanate feed containing less than 20% by weight of solvent in a divided-wall distillation column into four product fractions P1–P4. P1 is a vapor phase low-boiler and solvent-enriched gas stream, P2 is a low-boiler and solvent-enriched product, P3 is a high boiler-enriched bottoms product containing toluene diisocyanate and P4 is a toluene diisocyanate product stream lean in low-boilers, high-boilers and reaction residues.

    摘要翻译： 通过（a）将含有少于2重量％的光气的粗蒸馏进料分馏以除去溶剂和任选的反应残余物以产生粗甲苯，从含有小于2重量％的光气的粗蒸馏进料中回收甲苯二异氰酸酯 含有少于20重量％溶剂的二异氰酸酯进料和（b）在分壁蒸馏塔中将含有少于20重量％溶剂的粗甲苯二异氰酸酯进料分离成四个产物馏分P1-P4。 P1是蒸气相低沸点和富溶剂的气流，P2是低沸点和溶剂富含的产物，P3是含有甲苯二异氰酸酯的高富含塔底物的塔底产物，P4是低浓度的甲苯二异氰酸酯产物流 锅炉，高锅炉和反应残渣。

    Process for preparing isocyanates in the gas phase
    8.
    发明申请
    Process for preparing isocyanates in the gas phase 有权
    在气相中制备异氰酸酯的方法

    公开(公告)号：US20050113601A1

    公开(公告)日：2005-05-26

    申请号：US10969704

    申请日：2004-10-20

    申请人： Heiko Herold ,  Volker Michele ,  Werner Konig

    发明人： Heiko Herold ,  Volker Michele ,  Werner Konig

    IPC分类号： C07C263/10 ,  C07C265/04 ,  C07C265/10 ,  C07C265/12 ,  C07C265/14

    CPC分类号： C07C263/10 ,  C07C265/14

    摘要： A process for preparing isocyanates in the gas phase, in which the mixing of the reactants and thus the reaction conditions are significantly improved by means of hydrodynamic measures such as increasing the turbulence of the feed stream in the central nozzle. As a consequence, the necessary residence time in the reactor and thus the length of the reactor are reduced and the formation of polymeric by-products which lead to caking in the reactor and a shortening of the operating period of the reactors is avoided.

    摘要翻译： 在气相中制备异氰酸酯的方法，其中通过诸如增加中心喷嘴中的进料流的湍流的流体动力学测量，反应物的混合和因此反应条件的显着改善。 因此，在反应器中必需的停留时间以及因此反应器的长度减少，并且避免了导致在反应器中结块并使反应器的操作时间缩短的聚合副产物的形成。