Process for the production of n-methylcarbamates

Details Process for the production of n-methylcarbamates Process for the production of n-methylcarbamates

C - Chemistry, Metallurgy

07

D

260/469.2, 260/3

C07D 317/64 (2006.01) B01J 31/02 (2006.01) B01J 31/12 (2006.01) C07C 269/02 (2006.01) C07C 269/04 (2006.01) C07C 271/10 (2006.01) C07C 271/44 (2006.01) C07D 307/86 (2006.01) C07D 317/14 (2006.01) C07D 317/44 (2006.01) C07D 317/46 (2006.01) C07B 61/00 (2006.01) C07C 265/04 (2006.01)

Patent

CA 1249594

" PROCESS FOR THE PRODUCTION OF N-METHYLCARBAMATES" ABSTRACT OF THE DISCLOSURE Process for the production of N-methylcarbamates: Image (I) (wherein RO- is the radical of a substituted phenol or of a naphthol), wherein: in a first reaction step methylamine and diphenyl carbonate are reacted with each other, operating in the liquid phase and as a continuous process, in order to form phenol and phenyl-N-methylurethane; in a second reaction step phenyl-N-methylurethane, within the related reaction mixture outcoming from the first step, is thermally continuously decomposed, to yield a gaseous stream containing methyl isocyanate, from which the components different to methyl isocyanate are condensed off; in a third step the methyl isocyanate stream, outcoming from the second step, after a possible preliminary condensation, is continuously fed and contacted with a solution of a substituted phenol or of a naphthol in an inert organic solvent, containing a basic catalyst, to form N- methylcarbamate (I): N-methylcarbamate (I) is finally recoverred from the reaction mixture outcoming from the third step.

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