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    MONITORING OF THE STOICHIOMETRIC RATIO IN THE REACTION OF NITROAROMATICS WITH HYDROGEN
    2.
    发明申请
    MONITORING OF THE STOICHIOMETRIC RATIO IN THE REACTION OF NITROAROMATICS WITH HYDROGEN 有权
    在氢化反应中监测硝基比例的测定

    公开(公告)号：US20130211141A1

    公开(公告)日：2013-08-15

    申请号：US13759466

    申请日：2013-02-05

    申请人： Andreas RAICHLE ,  Stefanie Haase ,  Holgar Braunsberg ,  Johannes Buettner ,  Ulrich Penzel ,  Samuel Neto

    发明人： Andreas RAICHLE ,  Stefanie Haase ,  Holgar Braunsberg ,  Johannes Buettner ,  Ulrich Penzel ,  Samuel Neto

    IPC分类号： C07C209/36

    CPC分类号： C07C209/36 ,  C07C211/47 ,  C07C211/50

    摘要： The present invention relates to a continuous process for preparing at least one aromatic amine by hydrogenation of at least one nitroaromatic by means of hydrogen, where a liquid phase comprising at least the aromatic amine and a gas phase comprising at least hydrogen are present, in the presence of a catalyst suspended in the liquid phase at a temperature of from 50 to 250° C. and a pressure of from 5 to 50 bar, wherein the pressure in the reactor is kept essentially constant by continuous adaptation of the amount of hydrogen fed to the reactor, the total amount of hydrogen fed to the reactor is monitored and the introduction of the at least one nitroaromatic is interrupted if the hydrogen uptake in the reactor is not at least 50 mol % of the amount of hydrogen required for stoichiometric reaction of the at least one nitroaromatic to form the at least one aromatic amine.

    摘要翻译： 本发明涉及通过氢气至少一种硝基芳族化合物来制备至少一种芳族胺的连续方法，其中至少包含芳族胺的液相和至少包含氢的气相存在于 在50至250℃的温度和5至50巴的压力下悬浮在液相中的催化剂的存在，其中反应器中的压力通过连续适应供给到 监测反应器中进料到反应器中的氢气总量，如果反应器中的氢气吸收量不是化学计量反应所需的氢量的至少50摩尔％，则至少一种硝基芳族化合物的引入被中断 至少一种硝基芳族化合物以形成所述至少一种芳族胺。

    Method for producing dinitrotoluene
    4.
    发明授权
    Method for producing dinitrotoluene 有权
    二硝基甲苯生产方法

    公开(公告)号：US07851661B2

    公开(公告)日：2010-12-14

    申请号：US10586683

    申请日：2005-02-02

    申请人： Johannes Buettner ,  Wolfgang Mackenroth ,  Heinrich Hermann ,  Peter Konieczny ,  Juergen Gebauer

    发明人： Johannes Buettner ,  Wolfgang Mackenroth ,  Heinrich Hermann ,  Peter Konieczny ,  Juergen Gebauer

    IPC分类号： C07C205/00

    CPC分类号： C07C201/08 ,  C07C201/14 ,  C07C205/06

    摘要： The present invention provides a process for preparing dinitrotoluene, comprising the steps of a) reacting toluene with nitric acid in the presence of sulphuric acid to give mononitrotoluene, b) separating the reaction product from step a) into an organic phase comprising mononitrotoluene and an aqueous phase comprising sulfuric acid, c) reacting the organic phase comprising mononitrotoluene with nitric acid in the presence of sulphuric acid to give dinitrotoluene, d) separating the reaction product from step c) into an organic phase comprising dinitrotoluene and an aqueous phase comprising sulfuric acid, wherein the reaction product from step a) has a content of toluene of from 3.0 to 8% by weight, based on the organic phase, and a content of nitric acid of from 0.1 to 1.2% by weight, based on the aqueous phase, and the phase separation in step b) is effected in such a way that further reaction of the toluene with the nitric acid is prevented.

    摘要翻译： 本发明提供了制备二硝基甲苯的方法，包括以下步骤：a）在硫酸存在下使甲苯与硝酸反应得到一硝基甲苯，b）将步骤a）中的反应产物分离成包含单硝基甲苯和水 相，包括硫酸，c）在硫酸存在下使包含一硝基甲苯的有机相与硝酸反应，得到二硝基甲苯，d）将步骤c）中的反应产物分离成包含二硝基甲苯和含有硫酸的水相的有机相， 其中步骤a）的反应产物的甲苯含量为3.0-8重量％，基于有机相，硝酸含量为0.1-1.2重量％，基于水相，和 步骤b）中的相分离是以防止甲苯与硝酸进一步反应的方式进行的。