Process for preparing isocyanates

Details Process for preparing isocyanates Process for preparing isocyanates

C - Chemistry, Metallurgy

07

C

C07C 263/04 (2006.01) C07C 265/00 (2006.01) C07C 269/00 (2006.01)

Patent

CA 2091666

A process for preparing isocyanates comprising (a) contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and an organic, nitrogenous base to produce the corresponding ammonium carbamate salt, and (b) reacting the ammonium carbamate salt with an electrophilic or oxophilic dehydrating agent to produce the corresponding isocyanate. A second embodiment comprises recovering the ammonium carbamate salt of step (a) prior to reacting the ammonium carbamate salt with an electrophilic or oxophilic dehydrating agent in the presence of an aprotic organic solvent and an organic, nitrogenous base.

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