Carbamate process

Details Carbamate process Carbamate process

C - Chemistry, Metallurgy

07

C

260/468.8

C07C 271/06 (2006.01)

Patent

CA 1159074

ABSTRACT OF THE DISCLOSURE In the process of producing an aromatic polyiso- cyanate from a methylated benzene compound having the se- quential steps of ammoxidation, hydrolysis, conversion of amide to carbamate, condensation and conversion of poly- carbamate ester to polyisocyannte, the improvement of con- verting said amide to said carbamate in a one-step reaction wherein said amide is reacted with an N-halogenating agent in the presence of alcohol and in a reaction medium having a pH of from neutral to basic and a temperature greater than 40°C.

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