Process for preparing isocyanates by thermally cleaving carbamates

摘要

A process is proposed for preparing isocyanates by thermally cleaving carbamates to obtain a carbamate cleavage gas comprising the corresponding isocyanate and the corresponding alcohol, which comprises quenching the carbamate cleavage gas in the presence of an ether which functions as an inhibitor for the reverse reaction of the isocyanate with the alcohol.

主权项

1. A process for preparing an isocyanate, comprising:
thermally cleaving a carbamate to obtain a carbamate cleavage gas comprising an isocyanate and an alcohol, and quenching the carbamate cleavage gas in the presence of an ether, wherein the ether inhibits a reverse reaction of the isocyanate with the alcohol, wherein the ether is a polyalkylene glycol dialkyl ether, a polyalkylene glycol diaryl ether, or both.