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    Process for scrubbing dinitrotoluene
    1.
    发明授权
    Process for scrubbing dinitrotoluene 有权
    洗涤二硝基甲苯的方法

    公开(公告)号：US09249083B2

    公开(公告)日：2016-02-02

    申请号：US13870506

    申请日：2013-04-25

    Applicant: BASF SE

    Inventor： Samuel Neto ,  Ruediger Fritz ,  Renate Hempel ,  Holger Allardt ,  Barbara Becker ,  Julia Leschinski ,  Sebastian Ahrens ,  Heinrich Hermann ,  Mirko Haendel ,  Juergen Poehlmann

    IPC: C07C205/00 ,  C07C201/00 ,  C07C205/06 ,  C07C201/06

    CPC classification number: C07C205/06 ,  C07C201/06

    Abstract: The invention relates to a process for scrubbing a crude mixture comprising dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid obtained in the nitration of toluene after the nitrating acid has been separated off, which comprises two scrubbing steps (SS-I) and (SS-II), wherein i) in a first scrubbing step (SS-I), the crude mixture is extracted with a scrubbing acid I comprising nitric acid, nitrogen oxides and sulfuric acid in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (SS-I-1) of the first scrubbing step (SS-I) has a total acid content of from 20 to 40% by weight and a prescrubbed crude mixture is obtained, ii) in a second scrubbing step (SS-II), the prescrubbed crude mixture comprising dinitrotoluene is extracted with a scrubbing acid II in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (SS-II-1) of the second scrubbing step (SS-II) has a pH of less than or equal to 4 and a mixture comprising dinitrotoluene which is essentially free of nitric acid, sulfuric acid and nitrogen oxides is obtained.

    Abstract translation: 本发明涉及一种在分离出硝化酸后，除去包含二硝基甲苯，硝酸，氮氧化物和硫酸在硝化硝酸中得到的粗混合物的方法，该方法包括两个洗涤步骤（SS-I）和（SS -II），其中i）在第一洗涤步骤（SS-1）中，粗制混合物用包含硝酸，氮氧化物和硫酸的洗涤酸I在包含至少一个萃取阶段的洗涤中萃取，其中洗涤 从第一洗涤步骤（SS-I）的第一提取阶段（SS-I-1）排出的酸的总酸含量为20至40重量％，得到预混合的粗混合物，ii）在第二次 洗涤步骤（SS-II），包含二硝基甲苯的预先混合的粗混合物在洗涤中用擦洗酸II萃取，其包含至少一个提取阶段，其中从第一提取阶段（SS-II-1）排出的洗涤酸 第二洗涤步骤（SS- II）具有小于或等于4的pH，并且获得基本上不含硝酸，硫酸和氮氧化物的二硝基甲苯的混合物。

    Process for preparing isocyanates and/or polyisocyanates
    3.
    发明授权
    Process for preparing isocyanates and/or polyisocyanates 有权
    制备异氰酸酯和/或多异氰酸酯的方法

    公开(公告)号：US08686182B2

    公开(公告)日：2014-04-01

    申请号：US13661652

    申请日：2012-10-26

    Applicant: BASF SE

    Inventor： Julia Leschinski ,  Torsten Mattke ,  Gerrit Waters ,  Eckhard Stroefer

    IPC: C07C263/00

    CPC classification number: C07C263/10 ,  C07C265/14

    Abstract: The invention relates to a process for preparing isocyanates and/or polyisocyanates by reacting the corresponding amines with phosgene, optionally in the presence of an inert medium, in a reactor (1), a first reactant stream comprising the amine being supplied to the reactor (1) in liquid form, and a second reactant stream comprising the phosgene being supplied to the reactor in gaseous form. The reactor is a centrifugal reactor (1) having a packing (9) which rotates about a central axis (7) in a housing (13), the first reactant stream and the second reactant stream being supplied to the rotating packing (9) such that the reactant streams are mixed due to the centrifugal force in the rotating packing (9) and are transported outward, the mixing in the rotating packing (9) resulting in reaction of the phosgene with the amine to give the corresponding isocyanate or polyisocyanate.

    Abstract translation: 本发明涉及一种制备异氰酸酯和/或多异氰酸酯的方法，该方法通过使反应器（1）中任选在存在惰性介质的情况下使相应的胺与光气反应，将包含胺的第一反应物流供应至反应器 1），并且包含以气体形式供应到反应器的光气的第二反应物流。 反应器是具有在壳体（13）中围绕中心轴线（7）旋转的填料（9）的离心反应器（1），第一反应物流和第二反应物流被供应到旋转填料（9） 由于旋转填料（9）中的离心力将反应物流混合并向外输送，在旋转填料（9）中的混合导致光气与胺的反应，得到相应的异氰酸酯或多异氰酸酯。

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