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    Process for the two-step production of dinitrotoluene
    1.
    发明授权
    Process for the two-step production of dinitrotoluene 有权
    两步生产二硝基甲苯的方法

    公开(公告)号：US06984762B2

    公开(公告)日：2006-01-10

    申请号：US10780266

    申请日：2004-02-17

    申请人： Erwin Dieterich ,  Anke Hielscher ,  Berthold Keggenhoff ,  Manfred Keller-Killewald ,  Jürgen Münnig ,  Dietmar Wastian

    发明人： Erwin Dieterich ,  Anke Hielscher ,  Berthold Keggenhoff ,  Manfred Keller-Killewald ,  Jürgen Münnig ,  Dietmar Wastian

    IPC分类号： C07C205/00

    CPC分类号： C07C201/16 ,  C07C201/08 ,  C07C205/06

    摘要： The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene. In the first stage of this process, toluene was reacted adiabatically with nitrating acid so that at least 90% of the toluene was reacted off and no more than 70% of the toluene formed dinitrotoluene. The resulting organic phase containing mononitrotoluene and the aqueous acid phase containing sulfuric acid were separated, and the aqueous acid phase containing sulfuric acid was concentrated by flash evaporation. The resulting concentrated sulfuric acid was recycled into the reaction in the first stage, and/or into the reaction in the second stage, and/or into the concentration in the second stage.In the second stage, the organic phase containing mononitrotoluene from the first stage was completely reacted isothermally with nitrating acid. The organic phase and the aqueous acid phase containing sulfuric acid were then separated, and the aqueous acid phase containing sulfuric acid was concentrated by vacuum evaporation. The resulting concentrated sulfuric acid was recycled into the reaction in the first stage and/or the second stage.

    摘要翻译： 本发明涉及通过甲苯二段硝化生产二硝基甲苯的方法。 在该方法的第一阶段，将甲苯与硝酸进行绝热反应，使得甲苯的至少90％反应，并且不超过70％的甲苯形成二硝基甲苯。 分离含有单硝基甲苯和含硫酸水相的所得有机相，通过闪蒸浓缩含硫酸水相。 将所得浓硫酸在第一阶段循环进入反应，和/或在第二阶段进入反应，和/或在第二阶段中浓缩。 在第二阶段，含有来自第一阶段的一硝基甲苯的有机相与硝酸一起等温共同反应。 然后分离含有硫酸的有机相和含水酸相，真空蒸发浓缩含硫酸的酸水溶液。 所得浓硫酸在第一阶段和/或第二阶段循环进入反应。

    Enhanced process for the purification of anhydrous hydrogen chloride gas
    2.
    发明申请
    Enhanced process for the purification of anhydrous hydrogen chloride gas 审中-公开
    用于纯化无水氯化氢气体的增强方法

    公开(公告)号：US20070261437A1

    公开(公告)日：2007-11-15

    申请号：US11433809

    申请日：2006-05-12

    申请人： Eric Boonstra ,  John Teepe ,  Renae Vandekamp ,  Anke Hielscher ,  Kaspar Hallenberger

    发明人： Eric Boonstra ,  John Teepe ,  Renae Vandekamp ,  Anke Hielscher ,  Kaspar Hallenberger

    IPC分类号： F25J3/00

    CPC分类号： C01B7/0712

    摘要： The present invention relates to a process for purifying anhydrous hydrogen chloride gas (“aHCl”), and preferably the anhydrous hydrogen chloride gas recovered from an isocyanate production process. In the process of the present invention, the content of chlorinated organics may be reduced from up to 1000 ppm by volume to below 10 ppb by volume levels. Generally, the process of the invention allows for chlorinated organic levels to be reduced to from 1 to 100 ppb, rendering the treated hydrogen chloride gas usable in a catalytic oxychlorination process or a Deacon process. The treated gas is also suitable for absorption in water or dilute hydrochloric acid.

    摘要翻译： 本发明涉及一种净化无水氯化氢气体（“aHCl”）的方法，优选从异氰酸酯生产方法回收的无水氯化氢气体。 在本发明的方法中，氯化有机物的含量可以从高达1000ppm到低于10ppb的体积水平降低。 通常，本发明的方法允许将氯化有机水平降低至1至100ppb，使经处理的氯化氢气体可用于催化氧氯化过程或Deacon过程。 经处理的气体也适用于在水或稀盐酸中的吸收。