Basf Aktiengesellschaft

Basf Se Corporation

Volker Krase

Andreas Johann Schmidt

Matthias Kloetzer

Eckhard Stroefer

Peter Pfab

Michael Ochse

Gerhard Schulz

Joachim Pfeffinger

Eckhard Ströfer

Heinrich-Josef Blankertz

Gerhard Laqua

Andreas Otterbach

Gunter Georgi

Imbridt Murrar

Matthias Klötzer

Dieter Starosta

Matthias Kl&ouml;tzer

Peter Scherbel

Andreas Warzecha

Gisbert Franzke

Andreas Schmidt

The invention provides a multistage process for continuously preparing organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to low molecular mass monomeric polyurethanes, and thermally cleaving said polyurethanes, in which at defined reaction stages the polyisocyanates prepared and unusable residues are separated off, and reusable by products and intermediates are recycled to upstream stages.

Process for the preparation of isocyanates

The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized.

Method for producing isocyanates

A reactor for the thermal cleavage of monofunctional and/or polyfunctional carbamic esters into the corresponding isocyanate and hydroxyl components in the liquid phase having devices for introduction of heat into the reactor, where the devices are heat exchanger plates through which a heat transfer medium flows and have a geometry defined by the ratio of the degassing area to the volume and arrangement of the heating surfaces which makes it possible for the cleavage to be carried out in a two-phase mixture which has a gas content of over 50% by volume.

Reactor for thermally cracking monofunctional and polyfunctional carbamates

A process for the preparation of isocyanates from carbamic esters.

The present invention relates to a process for the dissociation of allophanates, in which a thermal dissociation is carried out in a reaction vessel and the gaseous dissociation products obtained are removed from the reaction vessel using an inert carrier gas or the vapor of a liquid as stripping medium and are condensed.

Thermal dissociation of allophanates

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Lauchhammer, Germany

Volker Krase