Production of polysuccinimide

C - Chemistry – Metallurgy – 08 – G

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C08G 73/10 (2006.01)

Patent

CA 2189231

Polysuccinimide is prepared by reacting ammonia gas with liquid maleic anhydride. The reaction is initially carried out at a temperature which is above the melting point of the maleic anhydride, but below the boiling point of liquid maleic anhydride for a time period sufficient for the liquid maleic anhydride to react with the ammonia gas to form a reaction product thereof. The reaction product is subsequently polymerized to polysuccinimide. The present method avoids the prior art problems of water removal and minimizes the need for ammonia handling equipment. The polysuccinimide product can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.

On prépare du polysuccinimide en faisant réagir de l'ammoniac gazeux avec un anhydride maléique liquide. La réaction s'effectue initialement à une température qui est au-dessus du point de fusion de l'anhydride maléique, mais au-dessous du point d'ébullition de l'anhydride maléique liquide, pendant une durée suffisante pour permettre à l'anhydride maléique liquide de réagir avec l'ammoniac gazeux pour former un produit de réaction. Ce dernier est ensuite transformé en polysuccinimide par polymérisation. Ce procédé résout les problèmes de l'extraction d'eau et minimise le besoin d'utiliser un équipement de traitement d'ammoniac. Si on le désire, le polysuccinimide ainsi produit peut être aisément hydrolysé afin d'obtenir de l'acide polyaspartique ou un sel de cet acide.

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