Process for the preparation of isophorone diisocyanate from isophorone dicarbamyl esters using highly selective SnO2 or CuO catalysts

Process for the preparation of isophorone diisocyanate from isophorone dicarbamyl esters using highly selective SnO2 or CuO catalysts

Isophorone diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate (IPDI) is prepared by liquid phase thermolysis of the corresponding bis-carbamic acid ester into the corresponding isocyanate and alcohol, respectively, in the presence of a highly selective metal oxide catalyst (SnO2 an...

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Bibliographische Detailangaben
Hauptverfasser: LUH, YUHSHI, FORGIONE, PETER SALVATORE
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
APPARATUS THEREFOR
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
GENERAL METHODS OF ORGANIC CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:Isophorone diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate (IPDI) is prepared by liquid phase thermolysis of the corresponding bis-carbamic acid ester into the corresponding isocyanate and alcohol, respectively, in the presence of a highly selective metal oxide catalyst (SnO2 and/or CuO). Typically, the cracking reaction is carried out at a temperature from 225 DEG to 350 DEG C, at a pressure of from 20 to 50 mmHg. These catalysts give high IPDI yields with high conversions of the carbamic acid esters.