中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

16 records (took 0.026 seconds)

    A PROCESS FOR OBTAINING 4,4'-DICHLORODIPHENYL SULFONE
    1.
    发明申请
    A PROCESS FOR OBTAINING 4,4'-DICHLORODIPHENYL SULFONE 有权

    公开(公告)号：US20220274923A1

    公开(公告)日：2022-09-01

    申请号：US17635031

    申请日：2020-08-20

    Applicant: BASF SE

    Inventor： Jessica Nadine HAMANN ,  Lukas Karl METZGER ,  Stefan BLEl

    IPC: C07C315/06

    Abstract: The invention relates to a process for obtaining 4,4′-dichlorodiphenyl sulfone from an organic mixture comprising 4,4′-dichlorodiphenyl sulfone and a linear C6 to C10 carboxylic acid as organic solvent, comprising: (a) cooling the organic mixture by (a1a) mixing the organic mixture with water in a crystallization vessel to obtain a liquid mixture; (a1b) cooling the liquid mixture obtained in (a1a) to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfone by (i) reducing the pressure in the crystallization vessel to a pressure at which the water starts to evaporate, (ii) condensing the evaporated water by cooling, (iii) mixing the condensed water into the liquid mixture in the crystallization vessel, to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfone; or by (a2) bringing the organic mixture into contact with at least one coolable surface and thereby reducing the temperature in the organic mixture with a cooling rate in the range from 5 to 50 K/h until a temperature in the range from 10 to 30° C. is reached, wherein the organic mixture and the at least one coolable surface have a temperature difference which is kept during the whole cooling process in the range from 1 to 30 K to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfone. (b) carrying out a solid-liquid-separation of the suspension obtained in (a1b) or in (a2) to obtain a residual moisture containing solid 4,4′-dichlorodiphenyl sulfone as product and mother liquor comprising the organic solvent and water.

    A PROCESS FOR PURIFYING CRUDE 4,4'-DICHLORODIPHENYL SULFONE
    3.
    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
    4.
    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).

    A PROCESS FOR PURIFYING 4,4'-DICHLORODIPHENYL SULFONE
    6.
    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 THE PREPARATION OF C3-5 SATURATED ALIPHATIC CARBOXYLIC ACIDS
    10.
    发明申请
    PROCESS FOR THE PREPARATION OF C3-5 SATURATED ALIPHATIC CARBOXYLIC ACIDS 有权

    公开(公告)号：US20230047974A1

    公开(公告)日：2023-02-16

    申请号：US17791542

    申请日：2020-12-29

    Applicant: BASF SE

    Inventor： Joaquim Henrique TELES ,  Jessica Nadine HAMANN ,  Jonathan Thomas LEFEBVRE ,  Wolf-Steffen WEISSKER ,  Shelue LIANG

    IPC: C07C51/235 ,  C07C51/44

    Abstract: A process for the preparation of a saturated aliphatic carboxylic acid with 3 to 5 carbon atoms by oxidation of the corresponding aldehyde with oxygen in which (a) the corresponding aldehyde is converted with oxygen at a temperature of 40 to 150° C. and an oxygen partial pressure of 0.001 to 1 MPa to obtain a mixture containing the saturated aliphatic carboxylic acid and ≤2 mol-% of the corresponding aldehyde with respect to the saturated aliphatic carboxylic acid, (b) the mixture obtained in step (a) is thermally treated in the liquid phase at a temperature of 80 to 250° C. and a pressure of 0.1 to 2 MPa abs for 0.25 to 100 hours, and (c) the mixture obtained in step (b) is distilled in a distillation apparatus to obtain a distillate containing ≥90 wt.-% of the saturated aliphatic carboxylic acid and having an active oxygen content of 0 to 25 wt.-ppm based on the distillate.

Patent Agency Ranking