Process for preparation of aromatic isocyanates

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

1976-08-05

1978-03-28

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C11800

Patent

active

040814726

ABSTRACT:
A process is described for preparing aromatic isocyanates by contacting an aromatic carbamate of the formula R(NHCO.sub.2 R')n at 150.degree.-350.degree. 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.

REFERENCES:
patent: 3919279 (1975-11-01), Rosenthal et al.
patent: 3962302 (1976-06-01), Rosenthal

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