Basf Aktiengesellschaft

Stephan Scholl

Heinz Auer

Siegfried Kruger

Axel Werner Polt

Johann-Peter Melder

Eckhard Stroefer

Hans Hasse

Andreas Woelfert

Herbert Helfert

Theodor Weber

Hans-Juergen Pallasch

Martin Schmidt-Radde

Bernd Bessling

Martin Sohn

Jurgen Mohr

Stephan H&uuml;ffer

Gerhard Laqua

Frans Vansant

Eckhard Str&ouml;fer

Christoph Übler

Ulrich Eiden

Bernd Diebold

Axel Franke

Winfried Terjung

Peter Dillmann

Hartmut Staatz

Thomas Mayer

Lutz Hilprecht

Rubens Ballenweg

Gunter Spiegel

Ulrich Loffler

Jurgen Pluckhan

Sebastian Zeck

Jan Peter Bredehoeft

Qi Zhao

Hans Mueller-Steinhagen

Klaus Gieselberg

Gerhard Brudi

Isocyanates are prepared by reacting primary amines with phosgene in a reactor by a process in which a reaction discharge is present in the form of a suspension which contains the isocyanate to be prepared, as a liquid, and carbamyl chlorides as a solid, and the suspension is worked up in a film evaporator, and this process is carried out in a production plant.

Reprocessing of reaction material discharged from phosgenation reactors

A process for working up residues from the preparation of pyrrolidone and/or N-vinylpyrrolidone comprises subjecting the residues to a thermolysis.

Method for processing pyrollidone and n-vinyl pyrollidone residues

A method of reacting a solution comprising a mixture of chemical compounds which are in chemical equilibrium with one another with at least one further chemical compound ( ) is provided. The method comprises the following steps: fractionation of the solution by means of a separation method to give at least two fractions ( ) which are enriched in different chemical compounds of the mixture; and reaction of a fraction ( ) with the further chemical compound or compounds ( ). The fractionation is advantageously carried out using a film evaporator ( ). Unreacted fractions ( ) can be recirculated via a residence time vessel ( ) back to the fractionation step. The method is particularly suitable for reactions of an aqueous formaldehyde solution in which various components of the solution (formaldehyde, methylene glycol, polyoxymethylene glycols) react in different ways.

Reaction of a solution comprising a mixture

The invention relates to a process for the production of a heat transfer device, which comprises electroless chemical deposition of a metal/polymer dispersion layer, in which the polymer is halogenated, on a heat transfer surface. The invention furthermore relates to a process for the production of a heat transfer device, wherein a metal/phosphorus layer with a thickness of from 1 to 15 &mgr;m is applied by electroless chemical deposition before application of the metal/polymer dispersion layer. The invention furthermore relates to a heat transfer device which can be produced by a process according to the invention, and to the use of a coating, produced by electroless chemical deposition of a metal/polymer dispersion layer, in which the polymer is halogenated, for reducing the tendency of the coated surfaces to accumulate solids from fluids, causing fouling.

Heat exchanger with a reduced tendency to produce deposits and method for producing same

Process for distilling ethylene oxide

Method and vaporizer for vaporizing oxidation-sensitive compounds

Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, wherein

Isolation of neopentyl glycol hydroxypivalate (NGH)

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Bad Dürkheim, Germany

Stephan Scholl