Chemical process

Details Chemical process Chemical process

C - Chemistry, Metallurgy

08

G

C08G 73/02 (2006.01) B01D 11/02 (2006.01) C08F 6/00 (2006.01)

Patent

CA 2612134

The invention relates to a process for the production of a nitrogen containing epihalohydrin polymer involving reaction of a nitrogen-containing precursor selected from the group consisting of amines, poly-amines, polyaminoamides, polyurethanes and mixtures thereof with epihalohydrin to form of a solution of said epihalohydrin polymer, the process comprising a purification step to remove organic impurities from the formed solution of the epihalohydrin polymer, said purification step comprising contacting the solution of the epihalohydrin polymer with a fluid under liquid, supercritical or near supercritical conditions to effect extraction of organic impurities from the solution of the epihalohydrin polymer to the fluid, withdrawing fluid enriched in organic impurities from the solution of the epihalohydrin polymer, and separating extracted impurities from the withdrawn fluid, wherein the fluid comprises a substance that at atmospheric pressure and room temperature (about 25~C) is gaseous. The invention also relates to a process for purifying a solution of a nitrogen containing epihalohydrin polymer.

L'invention concerne un procédé de production d'un polymère d'épihalohydrine contenant de l'azote qui implique la réaction d'un précurseur contenant de l'azote choisi dans le groupe composé d'amines, de polyamines, de polyaminoamides, de polyuréthannes et de mélanges de ceux-ci avec l'épihalohydrine pour former une solution dudit polymère d'épihalohydrine, ledit procédé comprenant une étape de purification pour évacuer des impuretés organiques de ladite solution formée du polymère d'épihalohydrine. L'étape de purification consiste notamment à mettre la solution en contact avec un fluide dans des états liquides, supercritiques ou presque supercritiques aux fins de l'extraction d'impuretés organiques de la solution de polymère d'épihalohydrine vers le fluide, ce qui permet de retirer le fluide enrichi d'impuretés organiques de la solution du polymère d'épihalohydrine, et de séparer les impuretés extraites du fluide retiré, ledit fluide comprenant une substance qui, à la pression atmosphérique et à la température ambiante (environ 25°C), est gazeuse. L'invention concerne enfin un procédé de purification d'une solution de polymère d'épihalohydrine contenant de l'azote.

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