Cross-linked polyimide membranes

Details Cross-linked polyimide membranes Cross-linked polyimide membranes

B - Operations, Transporting

01

D

B01D 71/62 (2006.01) B01D 53/22 (2006.01) B01D 61/02 (2006.01) B01D 67/00 (2006.01)

Patent

CA 2687382

The present invention provides a method for improving the performance of polyimide membranes as used in solvent-resistant nanofiltration. More specifically the method of the present invention allows to imrove the solvent stability of the polyimide membranes to solvents or solvent mixtures that would dissolve polyimide under the conditions applied during the filtration, such as dimethylforrnamide (DMF), N-methylpyrrolidinone (NMP), dimethylacetamide (DMAC), tetrahydrofuran (THF), y-butyrolacton (GBL), dimethylsulphoxide (DMSO) and chlorinated solvents.

La présente invention concerne un procédé permettant d'améliorer la performance des membranes en polyimide utilisées dans la nanofiltration résistante au solvant. De manière plus spécifique, le procédé de la présente invention permet d'améliorer la stabilité solvant des membranes en polyimide vis-à-vis des solvants ou des mélanges de solvants susceptibles de dissoudre le polyimide dans les conditions appliquées au cours de la filtration, tels que le diméthylformamide (DMF), la N-méthylpyrrolidinone (NMP), le diméthylacétamide (DMAC), le tétrahydrofurane (THF), la .gamma.-butyrolactone (GBL), le diméthylsulfoxyde (DMSO) et les solvants chlorés.

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