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    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE
    15.
    发明申请
    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220324795A1

    公开(公告)日：2022-10-13

    申请号：US17635142

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Jessica Nadine HAMANN ,  Stefan BLEI ,  Oliver BEY

    IPC: C07C315/02 ,  C07C317/14

    Abstract: The invention relates to a process for producing 4,4′-dichlorodiphenyl sulfone comprising reacting a solution comprising 4,4′-dichlorodiphenyl sulfoxide and at least one linear C6-C10 carboxylic acid as solvent with an oxidizing agent to obtain a crude reaction product comprising 4,4′-dichlorodiphenyl sulfone, wherein the concentration of water in the reaction mixture is kept below 5 wt %, the process comprising: (a) adding 0.9 to 1.05 mol oxidizing agent per mol 4,4′-dichlorodiphenyl sulfoxide uniformly distributed to the solution at a temperature in the range from 80 to 105° C. over a period from 1.5 to 5 h in a first step to obtain the reaction mixture; (b) agitating the reaction mixture after completion of the first step at the temperature of the first step for 5 to 30 min without adding oxidizing agent; (c) adding 0.05 to 0.2 mol oxidizing agent per mol 4,4′-dichlorodiphenyl sulfoxide to the reaction mixture at a temperature in the range from 80 to 105° C. over a period of less than 40 min in a second step; (d) agitating the reaction mixture after completion of the second step at the temperature of the second step for 10 to 30 min without adding oxidizing agent, (e) heating the reaction mixture to a temperature in the range from 95 to 110° C. and hold this temperature for 10 to 90 min to obtain a crude reaction product comprising 4,4′-dichlorodiphenyl sulfone.

    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE
    16.
    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.

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