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Hans H Schuster

Juergen Hambrecht

Hermann Dreher

Herbert Naarmann

Adolf Echte

Franz Brandstetter

Gerald Neubauer

Rudi W Reffert

David Agar

Paul-Michael Bever

James R Ryffel

Chih-Peng Wen

Peter Zehner

Wolfgang K Martin

The preparation of cyclohexene oxide, cyclohexanol and cyclohexanone involves

Cyclic preparation of cyclohexene oxide, cyclohexanol and cyclohexanone

A process for tempering unextracted polycaprolactam is disclosed which results in polycaprolactam having suitable physical and chemical properties for melt extrusion and spinning, without the need for conventional solvent/water extraction and drying of crude granules.

Continuous process for the hydrolytic production of polycaprolactam by

A coherent explosive gas phase in a gas/liquid reactor comprising a tubular body which is closed at the top and into which one or more jets of liquid which are fed from a liquid circulation and are directed downward, emerge from one or more nozzles located at the highest point of the reactor, and entrain a gas phase which is to be dispersed, introduce it into the liquid and finally produce complete dispersion of the gas, is avoided by a method wherein, before start-up of the liquid circulation, the inactive reactor is charged with an amount of liquid reactant such that a gas space corresponding to the subsequent gas hold-up of dispersed bubbles under operating conditions remains at the top of the reactor, this gas space is filled with a gas, at a pressure p.sub.1, which is inert under the reaction conditions, and the gaseous reactant is fed to the reactor only when, under the action of the liquid jet or jets, the inert gas has been dispersed into a hold-up of dispersed bubbles so that a coherent gas phase no longer exists.

Avoiding an explosive gas phase in gas/liquid reactions

In the preparation of a high molecular weight polyphenylene ether from a monohydric phenol by an oxidative coupling reaction with oxygen in the presence of a catalyst complex obtained from a metal salt and an organic amine and in the presence of a solvent, and isolation of the metal ion component of the catalyst from the polyphenylene ether solution by means of a complex-forming or chelate-forming compound, the catalyst is removed by a method wherein complex formation and isolation of the metal ion component of the catalyst are carried out in an aqueous medium in the presence of from 0.1 to 5,000 mg of an anionic or non-ionic surfactant.

Removal of the catalyst from polyphenylene ethers

Thermosplastic molding materials which contain styrene polymers and polyphenylene ethers whose phenolic hydroxyl groups have been reacted with reactive copolymers.

Thermoplastic molding materials containing polymers with polyphenylene

An apparatus for thoroughly mixing components of fluid material and, more particularly, for combining and homogenizing streams of gaseous, liquid and/or granular material by passage through a tube-like conduit which contains a plurality of consecutive mixing elements comprising a set of stationary, angularly disposed flow-deflecting baffles of particular form and configuration which cause a repeated dividing, displacement and recombining of the fluid stream and thereby provide improved radial mixing and approximation of ideal plug flow.

Growing community of inventors

Erpolzheim, Germany

Hans H Schuster