Basf Aktiengesellschaft

Basf Se Corporation

Jürgen Ciprian

Johann-Peter Melder

Alexander Weck

Georg Sieder

Heiner Schelling

Matthias Frauenkron

Günter Scherr

Lothar Franz

Frank-Friedrich Pape

Wolfgang Franzischka

Ulrich-Dieter Pessel

Stephan Maurer

Heinz Auer

Stefan Hirsch

Wulfrich Friedemann Beer

Klaus Beiser

Gabriele Iffland

Volkmar Menger

Axel Paul

Martin Sesing

Martin Karches

Olga Schubert

Hermann Ascherl

Martin Reif

Roland Bou Chedid

Filip Deberdt

Andreas Eichfelder

Werner Weinle

Christof Palm

Thomas Holtmann

York Alexander Beste

Jörg Schneider

Rainer Ehrhardt

A method for depleting halide ions from liquid ammonia, which comprises bringing the liquid ammonia into contact with a strongly basic ion exchanger, where the basic structure of the strongly basic ion exchanger is a covalently crosslinked polymer matrix and the content of ammonia in the liquid ammonia is more than 98% by weight.

Method for removing halogen from liquid ammonia

Process for the work-up of a mixture comprising ionic liquids and a further substance, wherein the substance present is separated off by means of adsorptive separation processes.

Purification or work-up on ionic liquids by means of adsorptive separation processes

The present invention relates to a process for preparing TEDA solutions comprising a solvent selected from the group consisting of polyhydric alcohols and ethers of polyhydric alcohols. The process comprises passing gaseous TEDA into the solvent and subsequently treating the solutions with one or more suitable adsorbents. This gives solutions which have only low color numbers and are color-stable on storage. The solutions can be used as such in preferred applications of TEDA, preferably polyurethane production.

Decoloration and color stabilization of TEDA solution

In a process for preparing polytetrahydrofuran having terminal OH groups (PTHF) from the corresponding polytetramethylene ether having acyloxy end groups by transesterification with alcohols in the presence of a sodium-containing catalyst followed by passing the alcoholic PTHF solution in the presence of a catalytic amount of water directly through at least one ion exchanger to remove the sodium ions, the removal of the sodium ions is carried out in a fully continuous ion exchange unit which comprises:

Method of producing an alcoholic solutions of polyetrahydrofurane that comprises terminal OH groups

The 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 a sodium-containing catalyst. In this process the polytetrahydrofuiran solution is passed in the presence of a catalytic amount of water directly through at least one ion exchanger following the transesterification in order to remove the sodium cations. The novel process makes it possible to remove the sodium cations from the sodium-containing catalyst in an economic manner and with little complexity. The residual sodium content can be reduced to values of less than 0.5 ppm.

Preparation of polytetrahydrofuran with terminal hydroxyl groups using

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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Ludwigshafen, Germany

Jürgen Ciprian