Process for preparing isocyanates

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 263/04 (2006.01)

Patent

CA 2178750

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 carbarnate 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.

L'invention concerne un procédé de préparation d'isocyanates consistant à mettre en contact du gaz carbonique avec une amine primaire en présence d'un solvant organique aprotique et d'une base choisie dans le groupe des composés du type phosphazène, une base organique azotée ou un mélange de telles bases, la base organique azotée étant choisie dans le groupe constitué par les composés de la guanidine, les composés de l'amidine, les amines tertiaires et leurs mélanges. On obtient ainsi le sel carbamate d'ammonium correspondant que l'on fait réagir avec un anhydride servant d'agent de déshydratation pour obtenir un produit contenant l'isocyanate correspondant, le solvant organique aprotique et le sel dérivé de la base et de l'anhydride. On sépare du mélange de produits le sel de la base, on récupère la base et on la recycle, et on régénère et on recycle l'anhydride servant d'agent de déshydratation.

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