Low pressure reverse osmosis and nanofiltration membranes...

B - Operations – Transporting – 01 – D

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B01D 67/00 (2006.01) B01D 69/12 (2006.01) B01D 71/56 (2006.01) C08G 69/48 (2006.01)

Patent

CA 2430036

Novel low pressure reverse osmosis and nanofiltration membranes and a process for their preparation are disclosed. Polyamide reverse osmosis membranes are contacted with organic sulfonic acid solutions without the need for additional treatment by a rejection enhancing agent. These membranes provide sodium chlordie rejections of greater than 20 percent and water fluxes greater than 15 gallons per square foot per day at a test pressure of 75 psi. Optimally treated membranes when tested similarly on 0.2 percent magnesium sulfate provide rejections greater than 95 percent with water fluxes greater than 15 gallons per square foot per day.

La présente invention concerne des membranes de nanofiltration et d'osmose inverse à basse pression et une méthode permettant de les préparer. Des membranes d'osmose inverse en polyamide sont mises au contact de solutions d'acide sulfonique organique sans qu'un traitement supplémentaire au moyen d'un agent facilitant le rejet soit nécessaire. Ces membranes permettent des rejets de chlorure de sodium supérieurs à 20 pour cent et des flux d'eau supérieurs à 15 gallons par mètre carré par jour à une pression d'épreuve de 75 psi. Des membranes traitées de manière optimale lorsque testées de façon similaire avec 0,2 pour cent de sulfate de magnésium permettent des rejets supérieurs à 95 pour cent avec des flux d'eau supérieurs à 15 gallons par mètre carré par jour.

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