Process for the preparation of isophorone diisocyanate from isop

Details Process for the preparation of isophorone diisocyanate from isop Process for the preparation of isophorone diisocyanate from isop

1986-04-04

1989-10-10

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C11900

Patent

active

048733652

ABSTRACT:
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 (SnO.sub.2 and/or CuO). Typically, the cracking reaction is carried out at a temperature from 225.degree. to 350.degree. C., at a pressure of from 20 to 50 mm Hg. These catalysts give high IPDI yields with high conversions of the carbamic acid esters.

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