Process for preparation of aromatic isocyanates

Details Process for preparation of aromatic isocyanates Process for preparation of aromatic isocyanates

C - Chemistry, Metallurgy

07

C

260/455.7

C07C 265/12 (2006.01) B01J 31/02 (2006.01) B01J 31/16 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1082728

A PROCESS FOR PREPARATION OF AROMATIC ISOCYANATES ABSTRACT OF THE DISCLOSURE A process is described for preparing aromatic isocyanates by contacting an aromatic carbamate of the formula R(NHCO2R')n at 150-350°C under reduced pressure with one or more metal or metal compound catalysts dissolved in an inert solvent. In the formula R is a divalent aromatic, R' is a monovalent aliphatic, alicyclic or aromatic with at most 8 carbon atoms and n is 1 or 2. The metal is dissolved in a concentration of at least 1/1000% by weight of the solvent. The vapors of the resulting aromatic isocyanate and alcohol or phenol are fractionally condensed under reduced pressure and the aromatic isocyanate is separately collected.

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