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    A PROCESS FOR PURIFYING 4,4'-DICHLORODIPHENYL SULFONE
    2.
    发明申请
    A PROCESS FOR PURIFYING 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220340519A1

    公开(公告)日：2022-10-27

    申请号：US17635529

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Jessica Nadine HAMANN ,  Oliver BEY ,  Petra DECKERT ,  Andreas MELZER ,  Christian SCHUETZ ,  Stefan BLEI ,  Frauke THRUN

    IPC: C07C315/06 ,  C08G75/23

    Abstract: The invention relates to a process for purifying 4,4′-dichlorodiphenyl sulfone comprising: (a) providing a suspension comprising particulate 4,4′-dichlorodiphenyl sulfone in carboxylic acid, (b) carrying out a solid-liquid separation of the suspension to obtain residual moisture containing 4,4′-dichlorodiphenyl sulfone and a carboxylic acid comprising filtrate, (c) washing the residual moisture containing 4,4′-dichlorodiphenyl sulfone with an aqueous base and then with water, (d) mixing the aqueous base after being used for washing with a strong acid, or mixing the aqueous base after being used for washing, the carboxylic acid comprising filtrate and a strong acid, (e) carrying out a phase separation in which an aqueous phase and an organic phase comprising the carboxylic acid are obtained.

    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE
    5.
    发明申请
    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220267261A1

    公开(公告)日：2022-08-25

    申请号：US17635580

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Jun GAO ,  Frauke THRUN ,  Indre THIEL ,  Jessica Nadine HAMANN ,  Christian SCHUETZ ,  Stefan BLEI

    IPC: C07C315/02 ,  C07C315/06

    Abstract: The invention relates to a process for producing 4,4′-dichlorodiphenyl sulfone, comprising: (I) reacting thionyl chloride, chlorobenzene and aluminum chloride forming an intermediate reaction product and hydrogen chloride; (II) mixing aqueous hydrochloric acid and the intermediate reaction product to obtain an organic phase comprising 4,4′-dichlorodiphenyl sulfoxide and an aqueous phase; (III) cooling the organic phase to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfoxide to obtain a suspension; (IV) solid-liquid-separation of the suspension to obtain crystallized 4,4′-dichlorodiphenyl sulfoxide, and mother liquor; (V) washing the crystallized 4,4′-dichlorodiphenyl sulfoxide with a carboxylic acid to obtain carboxylic acid-wet 4,4′-dichlorodiphenyl sulfoxide; (VI) reacting the washed 4,4′-dichlorodiphenyl sulfoxide and an oxidizing agent in a carboxylic acid as solvent to obtain a reaction mixture comprising 4,4′-dichlorodiphenyl sulfone and carboxylic acid; (VII) separating the reaction mixture comprising 4,4′-dichlorodiphenyl sulfone and carboxylic acid into a residual moisture comprising 4,4′-dichlorodiphenyl sulfone as crude product and a liquid phase comprising carboxylic acid.

    A PROCESS FOR PURIFYING CRUDE 4,4'-DICHLORODIPHENYL SULFONE
    9.
    发明申请
    A PROCESS FOR PURIFYING CRUDE 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220356152A1

    公开(公告)日：2022-11-10

    申请号：US17636932

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Stefan BLEI ,  Jessica Nadine HAMANN ,  Lukas Karl METZGER ,  Christian SCHUETZ ,  Jun GAO ,  Frauke THRUN ,  Andreas MELZER ,  Michael Klemens MUELLER

    IPC: C07C315/06

    Abstract: The invention relates to a process for purifying crude 4,4′-dichlorodiphenyl sulfone comprising: (a) dissolving the crude 4,4′-dichlorodiphenyl sulfone which may contain water in an organic solvent in which 4,4′-dichlorodiphenyl sulfone has a solubility of 0.5 to 20% at 20° C. and optionally adding water to obtain a solution which comprises 4,4′-dichlorodiphenyl sulfone, the organic solvent and 1 to 30 wt % water based on the amount of 4,4′-dichlorodiphenyl sulfone and water; (b) cooling the solution to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfone to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfone; (c) carrying out a solid-liquid separation to obtain residual moisture containing 4,4′-dichlorodiphenyl sulfone and a mother liquor; (d) washing the residual moisture containing 4,4′-dichlorodiphenyl sulfone with an organic solvent in which 4,4′-dichlorodiphenyl sulfone has a solubility of 0.5 to 20% at 20° C.; (e) optionally repeating steps (b) to (d); (f) drying the 4,4′-dichlorodiphenyl sulfone.

    A PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE
    10.
    发明申请
    A PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220289674A1

    公开(公告)日：2022-09-15

    申请号：US17635033

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Frauke THRUN ,  Jessica Nadine HAMANN ,  Christian SCHUETZ ,  Oliver BEY ,  Stefan BLEI

    IPC: C07C315/02 ,  C07C315/06

    Abstract: The invention relates to a process for producing 4,4′-dichlorodiphenyl sulfone, comprising: (a) reacting 4,4′-dichlorodiphenyl sulfoxide and an oxidizing agent in at least one carboxylic acid as solvent to obtain a reaction mixture comprising 4,4′-dichlorodiphenyl sulfone and carboxylic acid; (b) separating the reaction mixture into a first stream comprising 4,4′-dichlorodiphenyl sulfone and a second stream comprising carboxylic acid; (c) purifying the second stream comprising carboxylic acid by distilling a part of the second stream comprising carboxylic acid stripping low boilers from at least a part of the second stream comprising carboxylic acid (d) recycling the purified carboxylic acid into the reaction (a).

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