公开(公告)号：US20220135523A1

公开(公告)日：2022-05-05

申请号：US17429200

申请日：2020-02-06

Applicant: BASF SE

Inventor： Indre THIEL ,  Christian SCHUETZ ,  Andreas MELZER ,  Stefan BLEI

IPC: C07C315/06

Abstract: The invention relates to a process for purifying 4,4′-dichlorodiphenyl sulfoxide comprising: (a) providing a suspension comprising particulate 4,4′-dichlorodiphenyl sulfoxide in monochlorobenzene, (b) solid-liquid separation of the suspension to obtain residual moisture containing 4,4′-dichlorodiphenyl sulfoxide, (c) washing residual moisture containing 4,4′-dichlorodiphenyl sulfoxide with monochlorobenzene, (d) optionally repeating steps (a) to (c).

公开(公告)号：US20220135522A1

公开(公告)日：2022-05-05

申请号：US17429028

申请日：2020-02-06

Applicant: BASF SE

Inventor： Lukas METZGER ,  Christian SCHUETZ ,  Indre THIEL ,  Stefan BLEI

IPC: C07C315/06

Abstract: The invention relates to a process for obtaining 4,4′-dichlorodiphenyl sulfoxide from a liquid mixture comprising dichlorodiphenyl sulfoxide and a solvent, comprising: (a) cooling the liquid mixture to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfoxide in the solvent to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfoxide, (b) solid-liquid-separation of the suspension to obtain a residual moisture containing solid 4,4′-dichlorodiphenyl sulfoxide as a product and mother liquor, (c) concentrating the mother liquor, (d) recycling at least a part of the concentrated mother liquor into the cooling step (a).

公开(公告)号：US20220135521A1

公开(公告)日：2022-05-05

申请号：US17429035

申请日：2020-02-06

Applicant: BASF SE

Inventor： Indre THIEL ,  Oliver BEY ,  Christian SCHUETZ ,  Stefan BLEI

IPC: C07C315/02 ,  C07C315/06

Abstract: The invention relates to a process for producing 4,4′-dichlorodiphenyl sulfoxide comprising: (a) reacting thionyl chloride, chlorobenzene and aluminum chloride in a molar ratio of thionyl chloride:chlorobenzene:aluminum chloride of 1:(6 to 9):(1 to 1.5) at a temperature in the range from 0 to below 20° C., forming an intermediate reaction product and hydrogen chloride, (b) mixing aqueous hydrochloric acid and the intermediate reaction product at a temperature in the range from 70 to 110° C. to obtain a crude reaction product comprising 4,4′-dichlorodiphenyl sulfoxide, (c) separating the crude reaction product into an organic phase comprising the 4,4′-dichlorodiphenyl sulfoxide and an aqueous phase, (d) washing the organic phase with an extraction liquid.

公开(公告)号：US20220127221A1

公开(公告)日：2022-04-28

申请号：US17429043

申请日：2020-02-04

Applicant: BASF SE

Inventor： Indre THIEL ,  Christian SCHUETZ ,  Stefan BLEI ,  Jun GAO ,  Lukas METZGER

IPC: C07C315/06

Abstract: The invention relates to a crystal (C) consisting of at least 95% by weight of 4,4′-dichlorodiphenylsulfoxide, 0 to 2% by weight of impurities and 0 to 3% by weight of an organic solvent (os). Moreover, the present invention relates to a crystal composition (CC) comprising crystals (C) and a process for the production of the crystal composition (CC) and the crystal (C).