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    PROCESS FOR SCRUBBING DINITROTOLUENE
    1.
    发明申请
    PROCESS FOR SCRUBBING DINITROTOLUENE 有权
    用于洗涤DINTROOLUENE的方法

    公开(公告)号：US20140039227A1

    公开(公告)日：2014-02-06

    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: C07C205/06

    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。

    A PROCESS FOR PREPARING AT LEAST ONE AROMATIC ISOCYANATE
    2.
    发明申请
    A PROCESS FOR PREPARING AT LEAST ONE AROMATIC ISOCYANATE 有权

    公开(公告)号：US20240383822A1

    公开(公告)日：2024-11-21

    申请号：US18692911

    申请日：2022-09-19

    Applicant: BASF SE

    Inventor： Jonas MATTERN ,  Johannes BUETTNER ,  Ruediger FRITZ ,  Maximilian KOELLER ,  Jan Pablo JOSCH

    IPC: C07B43/10 ,  B01J19/24

    Abstract: A chemical process for preparing at least one aromatic isocyanate, said process comprising n chemical sub-processes sp(i), wherein a sub-process sp(i) is carried out in a chemical processing sub-unit U(i), i=1 . . . n, n≥1, wherein during a regular operating mode of a sub-unit U(i), the sub-process sp(i) being carried out in said sub-unit U(i) comprises feeding an educt composition E(i) comprising at least one aromatic compound ZjE(i), j≥(i), into said sub-unit U(i), processing said composition E(i) in said sub-unit U(i) and obtaining a product composition P(i) comprising at least one aromatic compound Zkp(i), k≥1, wherein the chemical process comprises starting up said sub-process sp(i) in said sub-unit U(i), wherein said starting-up comprises processing a chemical start-up composition S(i) in said sub-unit U(i), wherein said S(i) #E(i) and wherein said S(i) comprises at least one of the aromatic compounds Zkp(i).

    CHEMICAL PRODUCTION ASSEMBLY FOR ISOCYANATES
    3.
    发明申请
    CHEMICAL PRODUCTION ASSEMBLY FOR ISOCYANATES 有权

    公开(公告)号：US20240376043A1

    公开(公告)日：2024-11-14

    申请号：US18692963

    申请日：2022-09-19

    Applicant: BASF SE

    Inventor： Maximilian KOELLER ,  Johannes BUETTNER ,  Ruediger FRITZ ,  Jonas MATTERN ,  Jan Pablo JOSCH

    IPC: C07C263/10 ,  B01J19/00

    Abstract: A chemical production assembly for producing an isocyanate. comprising n serially arranged units U (i), i=1 . . . n, n≥2. wherein a unit U(i) is for preparing a chemical product cp(i) at a preparation rate PR(i) by using, as starting material. a chemical product cp(i+1) preprared in the unit U(i+1) ar—ranged upstream of said unit U(i), wherein said unit U(i) comprises an inlet means for receiving said chemical product cp(i+1) at an input rate IR(i). said unit U(i) being characterized by a nominal preparation rate PRN(i) and a nominal input rate IRN(i); and a unit U(i+1), i=1 . . . n-1, is for preparing the chemical product cp(i+1) and for supplying said chemical product cp(i+1) to the inlet means of the unit U(i) arranged downstream of said unit U(i+1) at a supply rate SR(i+1) with SR(i+1)=IR(i).

    PROCESS FOR CONCENTRATING DILUTED SULFURIC ACID
    4.
    发明公开
    PROCESS FOR CONCENTRATING DILUTED SULFURIC ACID 审中-公开

    公开(公告)号：US20230406704A1

    公开(公告)日：2023-12-21

    申请号：US18035946

    申请日：2021-11-11

    Applicant: BASF SE

    Inventor： Maximilian KOELLER ,  Johannes BUETTNER ,  Ruediger FRITZ ,  Jonas MATTERN

    IPC: C01B17/90 ,  C01B17/88 ,  C07C201/06

    CPC classification number: C01B17/905 ,  C01B17/88 ,  C07C201/06 ,  B01D1/0094

    Abstract: The invention relates to a process for concentrating diluted sulfuric acid (10) which may comprise at least one nitroaromatic compound and/or nitric acid as impurities, comprising: (a) feeding the diluted sulfuric acid (10) into a first stage (1) in which low boilers are removed by evaporation and/or stripping to obtain a first concentrated sulfuric acid (12); (b) optionally feeding the first concentrated sulfuric acid (12) into a second evaporation stage (2) to obtain a second concentrated sulfuric acid (14); (c) feeding the second concentrated sulfuric (14) acid into a third evaporation stage (3) if step (b) is carried out, or feeding the first concentrated sulfuric acid (12) into the third evaporation stage (3) if step (b) is not carried out, to obtain concentrated sulfuric acid (16) as product, wherein an oxidizing agent (17) and/or a precursor of an oxidizing agent is fed into the third evaporation stage (3).

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