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    SEPARATION METHOD FOR DINITROTOLUENE AND MIXED ACID IN A TOLUENE TO DINITROTOLUENE PROCESS
    2.
    发明公开
    SEPARATION METHOD FOR DINITROTOLUENE AND MIXED ACID IN A TOLUENE TO DINITROTOLUENE PROCESS 有权
    分离及二硝基甲苯和混合酸的甲苯到二硝基甲苯过程

    公开(公告)号：EP2935200A1

    公开(公告)日：2015-10-28

    申请号：EP13802958.2

    申请日：2013-12-10

    Applicant: BASF SE ,  Shanghai Basf Polyurethane Company Ltd.

    Inventor： DAI, Yuanshen ,  LI, Da Peng ,  JIA, Pei Shi ,  CAI, Zhan ,  NETO, Samuel

    IPC: C07C201/08

    CPC classification number: C07C201/08 ,  B01D17/0217 ,  C07C201/16 ,  C07C205/06

    Abstract: Proposed is a separation method in a toluene to dinitrotoluene process, wherein said method with a first process step comprising feeding a toluene comprising first stream (1) and a nitric acid comprising second stream (2) into a first reactor (R1), reacting of the toluene comprising first stream (1) and the nitric acid comprising second stream (2) within the first reactor (R1) to a first reaction mixture (3), said first reaction mixture (3) comprising a first liquid/liquid mixed phase of an acid phase and an organic phase comprising mononitrotoluene, feeding the first reaction mixture (3) into a first separation device (S1), separating the first reaction mixture (3) within the first separation device (S1) into a first forward stream (4) having a flow direction to a second process step and a first backward stream (5) having a flow direction back to the first reactor (R1), said method having a second process step comprising feeding the first forward stream (4) into a second reactor (R2), feeding a nitric acid comprising third stream (6) and a sulfuric acid comprising fourth stream (7) into the second reactor (R2), reacting of the first forward stream (4), the nitric acid comprising third stream (6) and the sulfuric acid comprising fourth stream (7) within the second reactor (R2) to a second reaction mixture (8), said second reaction mixture (8) comprising a second liquid/liquid mixed acid phase and an organic phase comprising mononitrotoluene and dinitrotoluene, feeding the second reaction mixture (8) into a second separation device (S2), separating the second reaction mixture (8) within the second separation device (S2) into a second forward stream (9) having a flow direction to a process output and a second backward stream (10) having a flow direction back to the first reactor (R1), wherein fine separating of at least one of the streams (4, 5, 9,10) after the first separation step (S1) and/or the second separation step (S2) in a coalescer is carried out.

    VERFAHREN ZUR HERSTELLUNG VON TOLUYLENDIAMIN DURCH HYDRIERUNG VON DINITROTOLUOL
    6.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON TOLUYLENDIAMIN DURCH HYDRIERUNG VON DINITROTOLUOL 有权
    受理并氢化二硝基甲苯二胺PRODUCING

    公开(公告)号：EP2382181A1

    公开(公告)日：2011-11-02

    申请号：EP09799345.5

    申请日：2009-12-21

    Applicant: BASF SE

    Inventor： COELHO TSOU, Joana ,  OEHLENSCHLÄGER, Steffen ,  SCHWAB, Ekkehard ,  MACKENROTH, Wolfgang ,  VOß, Hartwig ,  MAIXNER, Stefan ,  NETO, Samuel ,  BÖHMEKE, Sven ,  VAN LAAR, Frederik

    IPC: C07C209/36 ,  C07C211/50

    CPC classification number: C07C209/36 ,  C07C211/50

    Abstract: The invention relates to a method for producing toluylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst in a vertically upright reactor (1), at the upper end of which a propulsion jet nozzle (2) is arranged, through which the reaction mixture drawn from the reactor sump is injected into the upper area of the reactor (1) through an external loop, the reaction mixture then flowing into a central insertion pipe (4), which is arranged in the longitudinal direction of the reactor, flowing through said insertion pipe from top to bottom and flowing upward again in an internal loop movement outside of the insertion pipe (4), having a heat exchanger (6) in the interior space of the reactor (1), through which cooling water flows, and in the process absorbs part of the reaction heat, the dinitrotoluene being fed at the upper end of the reactor (1) and the hydrogen being fed at the lower end of the reactor (1), and in addition to the heat exchanger (6) arranged in the interior space of the reactor (1), another heat exchanger (W) being inserted in the external loop, water absorbing the remaining reaction heat through indirect heat exchange with the reaction mixture, characterized in that the reaction heat is used to produce steam at an overpressure of at least 4 bar in that the hydrogenation of dinitrotoluene into toluylenediamine is performed at a temperature > 180°C.

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