Method for producing 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 an...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BLANKERTZ HEINRICH-JOSEF, SCHULZ GERHARD, GEORGI GUNTER, WARZECHA ANDREAS, KRASE VOLKER, STROEFER ECKHARD, KLOETZER MATTHIAS
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung: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.