High flux semipermeable membranes

B - Operations – Transporting – 01 – D

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B01D 69/12 (2006.01)

Patent

CA 2063787

High flux semipermeable membranes which comprise a polymerized reaction product within and/or on a porous support may be prepared by contacting the porous support such as a polysulfone sheet with an aqueous solution of a polyamine, said aqueous solution containing a polar aprotic solvent not reactive with amines and optionally an acid acceptor. The surface of the coated support is dried to the touch and then contacted with an organic solution of a polycarboxylic acid halide for a period of time sufficient to form a polymerized reaction product within and/or on the surface of the support material. The resulting composite may be post treated by washing with an alkaline compound. The resultant membrane composite may be used in separation processes such as the desalination of brackish or seawater, or the softening of domestic hard water.

On peut préparer des membranes semi-perméables à flux élevé comprenant un produit de réaction polymérisé se trouvant à l'intérieur et/ou sur un support poreux, par mise en contact du support poreux tel qu'une feuille de polysulfone avec une solution aqueuse d'une polyamine, ladite solution aqueuse contenant un solvant aprotique polaire ne réagissant pas avec les amines, et facultativement un accepteur d'acide. On sèche la surface du support revêtu, puis on la met en contact avec une solution organique d'un halogénure d'acide polycarboxylique pendant une période suffisante pour former un produit de réaction polymérisé dans et/ou sur la surface de la matière de support. On peut post-traiter le composite obtenu par lavage à l'aide d'un composé alcalin. On peut utiliser le composite de la membrane obtenue dans des procédés de séparation tels que la dessalinisation d'eau saumâtre ou d'eau de mer, ou l'adoucissement d'eau domestique dure.

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