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25 条记录 (耗时 0.056 秒)

    Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane series
    24.
    发明授权
    Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane series 失效
    通过二苯基甲烷系列的非中和多胺的光气化生产二苯基甲烷系列的多异氰酸酯的方法

    公开(公告)号：US07041776B2

    公开(公告)日：2006-05-09

    申请号：US10672440

    申请日：2003-09-26

    申请人： Daniel Koch ,  Hans-Georg Pirkl ,  Torsten Hagen ,  Stefan Wershofen

    发明人： Daniel Koch ,  Hans-Georg Pirkl ,  Torsten Hagen ,  Stefan Wershofen

    IPC分类号： C08G12/06

    CPC分类号： C08G18/7664 ,  C07C209/78 ,  C07C263/10 ,  C07C265/14

    摘要： The invention relates to a method of producing polyisocyanates of the diphenylmethane series including the steps of a) reacting aniline and formaldehyde in the presence of HCl to provide a product mixture containing polyamines of the diphenylmethane series, HCl, aniline and water; b) removing excess aniline and water by distillation to provide a product mixture comprising polyamines of the diphenylmethane series, HCl, no more than 10 wt. % aniline based on the polyamines, and no more than 5 wt. % water based on the polyamines; and c) phosgenating the product mixture in (b).

    摘要翻译： 本发明涉及一种生产二苯基甲烷系列的多异氰酸酯的方法，包括以下步骤：a）在HCl存在下使苯胺和甲醛反应，得到含有二苯基甲烷系列，HCl，苯胺和水的多胺的产物混合物; b）通过蒸馏除去过量的苯胺和水，以提供包含二苯基甲烷系列的多胺（HCl）的产物混合物，不超过10wt。 基于多胺的％苯胺，不超过5重量％ 基于多胺的％水; 和c）使（b）中的产物混合物光气化。

    Adiabatic process for producing dinitrotoluene
    25.
    发明授权
    Adiabatic process for producing dinitrotoluene 有权
    制备二硝基甲苯的绝热方法

    公开(公告)号：US06528690B2

    公开(公告)日：2003-03-04

    申请号：US09169087

    申请日：1998-10-10

    申请人： Uwe Klingler ,  Hans-Georg Pirkl ,  Thomas Schieb ,  Dietmar Wastian

    发明人： Uwe Klingler ,  Hans-Georg Pirkl ,  Thomas Schieb ,  Dietmar Wastian

    IPC分类号： C07C20500

    CPC分类号： C07C201/08 ,  C07C205/06

    摘要： Dinitrotoluene (DNT) is produced by the adiabatic nitration of toluene with nitric acid at a temperature of from about 60 to about 200° C. and at a molar ratio of toluene to nitric acid of from about 1:1.5 to about 1:3.0. The reaction mixture thus-obtained is concentrated to a water content of up to 30% by weight. The dinitrotoluene which is present in the reaction mixture is at least partially (if not completely) removed from the reaction mixture either before or after concentration of the reaction mixture. The DNT which is still present in the vapor generated during the concentration of the reaction mixture is kept liquid by the addition of a solvent to the vapors generated during concentration of the reaction mixture. The solvent added to vapor, together with any DNT present in the vapor is recovered. This solvent/DNT mixture may be recycled directly to the reaction vessel. The solvent/DNT mixture may also be separated. The separated solvent may be recycled to the solvent addition step. The separated DNT may be combined with the recovered DNT product or it may be recycled to the nitration reaction mixture.

    摘要翻译： 二硝基甲苯（DNT）通过甲苯与硝酸在约60至约200℃的温度和甲苯与硝酸的摩尔比为约1:1.5至约1:3.0的绝热硝化来制备。 将由此获得的反应混合物浓缩至至多30重量％的含水量。 存在于反应混合物中的二硝基甲苯在反应混合物浓缩之前或之后至少部分（如果不是完全）从反应混合物中除去。 仍然存在于反应混合物浓缩期间产生的蒸汽中的DNT通过向反应混合物浓缩期间产生的蒸气中加入溶剂而保持液体。 加入到蒸气中的溶剂与蒸气中存在的任何DNT一起被回收。 该溶剂/ DNT混合物可以直接再循环到反应容器中。 溶剂/ DNT混合物也可以分离。 分离的溶剂可以再循环到溶剂添加步骤中。 分离的DNT可以与回收的DNT产物组合，或者可以将其再循环到硝化反应混合物中。