Abstract: 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.

Abstract: A method for modifying an electronic device (10) using authenticated data from a data host (12) comprises the steps of the a signing service (13) digitally signing the data with a digital signature using a signature private key of a signature key pair and providing the signed data to the data host (12), the electronic device (10) retrieving the signed data from the data host (12), the electronic device (10) confirming a signature public key of the signature key pair using a certificate of a certificate authority (14), the electronic device (10) checking whether the certificate is valid, and the electronic device (10) confirming the digital signature and thus authenticity of the data using the signature public key. The certificate includes an iteration number, and the electronic device (10) checks whether the certificate is valid based on the iteration number.

Abstract: A computer-implemented method for controlling and/or monitoring equipment (110) of a chemical plant is proposed.

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).

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).

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).

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).