PROCESS FOR PURIFYING 4,4'-DICHLORODIPHENYL SULFOXIDE

    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

    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).

    A PROCESS FOR OBTAINING 4,4'-DICHLORODIPHENYL SULFOXIDE

    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

    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).

    PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFOXIDE

    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

    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.

Patent Agency Ranking