Basf Aktiengesellschaft

Basf Se Corporation

Basf Coatings Ag

Werner Weinle

Peter Zehner

Lothar Franz

Heinz Auer

Wolfgang Franzischka

Toni Dockner

Alexander Weck

Gerd Haderlein

Michael Bartsch

Jens Scheidel

Oliver Bey

Joachim Woltering

Thomas Ostrowski

Achim Loeffler

Gabriele Iffland

Regina Benfer

Maximilian Bendix

Stefan Birnbach

Tobias Aechtner

Dirk Meckelnburg

Jarren Peters

Klaus Borho

Ulrich Kalck

J&uuml;rgen Mohr

Walter Bieg

Ulrich-Dieter Pessel

Renata Jovanovic

J&uuml;rgen Ciprian

Klaus Beiser

Bernd Ruge

Thorsten Hofrichter

Heike Schuchmann

Michael Schiessl

Sven R&uuml;ck

Markus Antonietti

Christian Dienes

Stephan Herwig

Alexander Tempel

Alexandre Tempel

A process for preparing biphenols of the general formula I  

Method for producing biphenols from monophenols

The invention provides a process for continuously preparing polyether alcohols using DMC catalysts, which comprises, in a first step, in a continuous reactor, adding alkylene oxides onto H-functional starter substances and transferring the output of this reactor to a second step in a reactor which is divided by closed trays into mutually separate sections, known as compartments, which are connected to one another by external pipelines, in which the output of the reactor from the first step of the reaction passes through the compartments in succession.

Method for producing polyether alcohols

A reactor () for gas/liquid or gas/liquid/solid reactions having a vertical longitudinal axis and an inlet () for a liquid or liquid/solid feed stream in the upper region of the reactor and an inlet () for a gaseous stream in the lower region of the reactor (), wherein the gaseous stream () is conveyed through a gas distributor module () which is made up exclusively of straight tube sections ().

Reactor for gas/liquid or gas/liquid/solid reactions

The present invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols in the presence of an alkali metal- or alkaline earth metal-containing catalyst, which entails the appropriate acyloxy-containing polymer being introduced together with the alcohol and the catalyst into a first prereactor (I) and converted therein at least partly to the hydroxyl-containing polymer, and the reaction solution being fed into the upper zone (IIa) of a distillation column (II) into whose lower zone (IIb) alcohol in vapor phase is additionally fed. This involves a phase exchange at the coherent and the disperse phase at the transition from the prereactor to the distillation column. Preferably, in addition to the first prereactor, a further 3 prereactors are used which serve as holdup reactors.

Production of polytetrahydrofuran with terminal hydroxyl groups by changing the continuous and dispersed phase

The invention relates to a process for preparing an aqueous powder coating dispersion, which comprises introducing a liquid melt comprising binders and crosslinking agents and also, if desired, catalysts, auxiliaries and further additives such as devolatilizers, UV absorbers, free-radical scavengers and/or antioxidants into an emulsifying apparatus, preferably with the addition of water and stabilizers, and cooling and filtering the resultant emulsion.

Aqueous powder-paint dispersion

A process for the continuous production of 1,3-dioxolan-2-ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in the liquid phase in the presence of a catalyst comprises conducting the reaction in a two-part reactor in whose first part the reaction is taken with backmixing to a conversion of not less than 80% of the oxirane II and in whose second part the reaction is completed under nonbackmixing conditions, and passing the carbon dioxide in countercurrent to the oxirane II in the entire reactor.

Method for the continuous production of 1,3-dioxolan-2-ones

A process for preparing hydroxyl-containing polymers and, in particular, a process for preparing polytetrahydrofuran with terminal hydroxyl groups from the corresponding acyloxy-containing polymers by transesterification with alcohols is carried out continuously in at least one stirred vessel, with the foam produced in the transesterification being fed tangentially to a cylindrical container, preferably a cyclone separator, at an adequate velocity to destroy the foam. The liquid phase which separates out is recycled through a line to the at least one stirred vessel. This continuous process is preferably carried out in a cascade of stirred vessels, in which each stirred vessel or a subunit of at least two stirred vessels can in each case be coupled to a cylindrical container, preferably in the form of a cyclone separator.

Continuous preparation of polytetrahydrofuran by a transesterification

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Bad Friedrichshall, Germany

Werner Weinle