Basf Se Corporation

Sick Ag

Karlsruher Institut Fur Technologie

Lukas Metzger

Stefan Blei

Indre Thiel

Jun Gao

Christian Schuetz

Oliver Bey

Jessica Nadine Hamann

Sebastian Fandrich

Ricco Kügler

Matthias Kind

Kai-Jannick Fritsch

The invention relates to a process for producing 4,4'-dichlorodiphenyl sulfoxide comprising: (I) 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; (II) mixing aqueous hydrochloric acid and the intermediate reaction product at a temperature in the range from 70 to 110° C. to obtain an organic phase comprising 4,4′-dichlorodiphenyl sulfoxide and an aqueous phase; (III) cooling the organic phase comprising the 4,4′-dichlorodiphenyl sulfoxide to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfoxide to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfoxide; (IV) solid-liquid-separation of the suspension to obtain a residual moisture containing solid 4,4′-dichlorodiphenyl sulfoxide comprising crystallized 4,4′-dichlorodiphenyl sulfoxide and mother liquor.

Process for producing 4,4'-dichlorodiphenyl sulfoxide

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).

Crystal composition (CC) comprising 4,4#-dichlorodiphenylsulfoxide crystals (C)

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Ludwigshafen, Germany

Lukas Metzger