Process for recovering cellulose ethers from aqueous...

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B01D 61/00 (2006.01) B01D 61/14 (2006.01) B01D 61/16 (2006.01) B01D 63/16 (2006.01) C08B 11/20 (2006.01)

Patent

CA 2435007

The invention relates to a process for recovering cellulose ethers from aqueous solutions, particularly from the washing media obtained in the purification of crude cellulose ethers. The process comprises the following steps: (a) passing the aqueous solution through an ultrafiltration membrane apparatus creating enhanced shear at the surface of the ultrafiltration membrane at a temperature below the flocculation temperature of the cellulose ether; (b) diluting the retentate obtained in step (a) with a solvent in a volume ratio of solvent to retentate in the range of 1:1 to 40:1; and (c) passing the diluted retentate obtained in step (b) through an ultrafiltration membrane apparatus creating enhanced shear at the surface of the ultrafiltration membrane at a temperature below the flocculation temperature of the cellulose ether. The process of the invention provides a good retention of cellulose ether at high membrane fluxes.

La présente invention concerne un procédé de récupération d'éthers cellulosiques à partir de solutions aqueuses, en particulier à partir de milieux de lavage obtenus lors de la purification d'éthers cellulosiques bruts. Ce procédé consiste (a) à faire passer la solution aqueuse par un dispositif à membrane d'ultrafiltration produisant un effet de cisaillement important à la surface de la membrane d'ultrafiltration à une température inférieure à la température de floculation de l'éther cellulosique, (b) à diluer le retentat obtenu dans l'étape (a) avec un solvant dans un rapport volumétrique du solvant par rapport au retentat compris entre 1:1 et 40:1, et (c) à faire passer le retentat dilué obtenu dans l'étape (b) par un dispositif à membrane d'ultrafiltration produisant un effet de cisaillement important à la surface de la membrane d'ultrafiltration à une température inférieure à la température de floculation de l'éther cellulosique. Le procédé de la présente invention permet d'obtenir une bonne rétention de l'éther cellulosique à des débits membranaires importants.

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