Huels Aktiengesellschaft

Huls Aktiengesellschaft

Huels Aktiengesellschaft - Pb 15

Alfred Oberholz

John Kahsnitz

Friedrich-Wilhelm Kupper

Stefan Schmidt

Franz Nierlich

Wolfgang H Muller

Bernd Nowitzki

Frank Steding

Bernhard Stutzel

Michael Zolffel

Alfred Wieland

Udo Knippenberg

John Kashnitz

Carrying out a chemical reaction in a reaction distillation column on an inorganic catalyst in the form of a column packing material which is maintained above the column bottom permits the use of high reaction temperatures and the easy removal or replacement of inactivated catalyst.

Method of carrying out chemical reactions in reaction distillation

C.sub.8-18 alkylpolyglycosides are prepared by reacting a C.sub.1-6 alkyl glycoside with a C.sub.8-18 alcohol in a reaction column.

Process for the preparation of alkyl polyglycosides

Alkyl glycosides and alkyl oligoglycosides of low iodine color number can be prepared

Process for the preparation of alkyl glycosides and alkyl oligoglycosides

Alcohols and acids are esterified by means of liquid-phase equilibrium reactions on ion exchangers in an apparatus comprising a prereactor and a rectifying column with external reactors. The process is characterized by the fact that a portion of one of the starting compounds is fed directly to the external reactors.

Process for the preparation of esters

For producing 2,6-di-tert-butylphenol and products therefrom, utilizing small quantities of aluminum tris-(2-tert-butylphenolate as a catalyst by reaction of 2-tert-butylphenol with isobutene in the liquid phase, the reaction is performed in the presence of diluents such as liquid saturated aliphatic or cycloaliphatic hydrocarbons, C.sub.5 -C.sub.16 alkenes of formula R.sub.1 --CH.dbd.CH.sub.2 or R.sub.2 --CH.dbd.CH--R.sub.3, C.sub.5 to C.sub.12 cycloalkenes, which contain no branching on the C.dbd.C-bond, excess isobutene or mixtures thereof, at temperatures of 0.degree. C. to 80.degree. C., pressures of 0.1 to 11 bars and catalyst amounts of 0.005 to 5 mol %, based on 2-tert-butylphenol. High conversions are obtained with few undesirable trialkylated products.

Process for the production of 2,6-di-tert-butylphenol

Molding compositions based on polyvinyl chloride contain as the component imparting impact resistance homo- and copolymeric acrylic acid esters of oxethylates of phenol or of substituted phenols, wherein the difference of the indices of refraction n.sub.D.sup.20 (at least 20.degree. C., measured with the Na D line) between the basic polymer and the component imparting impact resistance at most is .+-.0.01; optionally copolymers with other acrylic acid esters can also be used in the molding compositions. The latter are inexpensive to manufacture and, besides transparency and weatherability, also have impact resistance.

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Marl, Germany

Alfred Oberholz