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    A PROCESS FOR PREPARING AT LEAST ONE AROMATIC ISOCYANATE
    1.
    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
    2.
    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
    3.
    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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