Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Patent
1993-12-27
1995-09-19
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
560352, C07C26304
Patent
active
054516978
ABSTRACT:
A process for preparing isocyanates comprising contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous base and mixtures thereof, wherein the organic, nitrogenous base selected from the group consisting of guanidine compounds, amidine compounds, tertiary amines and mixtures thereof to produce the corresponding ammonium carbamate salt, reacting the ammonium carbamate salt with an anhydride dehydrating agent to produce a product stream comprising the corresponding isocyanate, the aprotic organic solvent and the base salt derived from the anhydride, separating the base salt from the product stream, recovering and recycling the base, and regenerating and recycling the anhydride dehydrating agent.
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McGhee William D.
Paster Mark D.
Riley Dennis P.
Ruettimann Kenneth W.
Solodar A. John
Bolding James C.
Dees Jos,e G.
Goetz Kenneth D.
Monsanto Company
Passley Paul L.
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