Process for recovering a polymer from a solution

Details Process for recovering a polymer from a solution Process for recovering a polymer from a solution

C - Chemistry, Metallurgy

08

F

C08F 6/12 (2006.01) C08J 3/14 (2006.01) C08J 11/08 (2006.01)

Patent

CA 2699589

Process for recovering a polymer by injection of steam, and optionally liquid water, into a solution of this polymer comprising a polar aprotic organic solvent (PAOS) that has an azeotrope with water and an apolar organic compound that is miscible with the PAOS and immiscible with water and that acts as a phase separation agent (PSA), the boiling point of which is below that of the water/PAOS azeotrope, the amount of steam injected being sufficient to give rise to the substantial removal of the PSA via stripping and that of the PAOS via azeotropic distillation, and the total amount of water being sufficient to give rise to the precip-itation of the polymer, this process being characterized in that the polymer solution also comprises an alcohol, at least during the precipitation of the polymer.

L'invention concerne un processus pour extraire un polymère par injection de vapeur, et éventuellement d'eau liquide, d'une solution contenant le polymère et comprenant un solvant organique aprotique polaire (PAOS) qui présente un azéotrope d'eau et d'un composé organique apolaire miscible au PAOS et qui ne peut pas être mélangé avec de l'eau, qui agit comme agent de séparation de phase (PSA), son point de fusion étant inférieur à celui de l'azéotrope eau/PAOS, la quantité de vapeur injectée étant suffisante pour augmenter l'élimination substantielle de l'agent de séparation de phase par désorption, et celle du PAOS par distillation azéotropique, la quantité totale d'eau étant suffisante pour augmenter la précipitation du polymère. Le processus est caractérisé en ce que la solution polymère comprend également un alcool, au moins durant la précipitation du polymère.

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