Basf Se Corporation

Jun Gao

Joaquim Henrique Teles

Martin Weber

Klaus Hahn

Ulrich Müller

Andrei-Nicolae Parvulescu

Christian Maletzko

Stefan Blei

Indre Thiel

Klaus-Dieter Hungenberg

Lukas Metzger

Christian Schuetz

Oliver Bey

Juergen Schmidt-Thuemmes

Bernhard Schmied

Jan Holoch

Olaf Kriha

Wolfram Husemann

Michel Pepers

Jan Spielmann

Birgit Reinhard

Eckhard Neufeld

Pascal Hesse

Frauke Thrun

Renata Jovanovic

Wolfgang Kasten

Wilfried Vogel

Jessica Nadine Hamann

Wolfgang Ferstl

Rudolf Süttinger

Ping Zhang

Xiang-Ming Kong

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)

A process for preparing polyaryl ethers in which a polycondensation of the monomer building blocks is carried out using microwave irradiation leads to thermoplastic molding compositions having improved color properties.

Process for preparing an organic sulfone

The invention provides a process for preparing expandable styrene polymers which comprises the steps of:

Preparing expandable styrene polymers

The present invention provides a novel one-step process for preparing an aqueous polymer dispersion by the free radical aqueous emulsion polymerization comprising mixing at least water, a dispersant, and an oil-soluble initiator; raising a temperature from the starting to the end reaction temperature while metering at least ethylenically unsaturated monomers and a water-soluble initiator into a reaction vessel, conducting polymerization of the monomers in the presence of the water-soluble initiator at a temperature up to the end reaction temperature, and when the temperature has reached the end reaction temperature, conducting polymerization by the oil-soluble initiator. The oil-soluble initiator is inactive at the starting reaction temperature and becomes more active as a temperature approaches the end reaction temperature at which the oil-soluble initiator is fully active.

Free-radical polymerization process producing aqueous polymer dispersion with low residual monomer content utilizing oil and water soluble initiators

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Ludwigshafen, Germany

Jun Gao