Spiral wound element for separations

Details Spiral wound element for separations Spiral wound element for separations

B - Operations, Transporting

01

D

B01D 63/10 (2006.01) B01D 61/18 (2006.01) B01D 61/36 (2006.01)

Patent

CA 2097632

An improved spiral wound element for separations is disclosed wherein the improvement comprises using as the feed/retentate space one or more layers of a material having an open cross-sectional area in the range 30 to 70% and as the permeate spacer material at least three layers of material two of which are fine and have an open cross-sectional area of about 10 to 50% surrounding a coarse layer having an open cross-sectional area of about 50 to 90%. Elements of this configuration exhibit element separation performance nearly equivalent to that obtained using only the membrane. Such elements are useful in reverse osmosis, ultrafiltration, pervaporation and other separation processes in which a pressure gradient is maintained across the membrane into a permeate zone.

Cette invention concerne un élément spiralé amélioré de séparation dont l'amélioration consiste à utiliser comme espaceur pour l'alimentation/rétention une ou plusieurs couches de matériau dont la section ouverte représente entre 30 et 70 % de la section totale et comme espaceur pour le perméat au moins trois couches de matériau dont les deux premiers sont fins et affichent une section ouverte d'environ 10 à 50 % de la section totale et qui entourent une couche grossière dont la section ouverte représente environ 50 à 90 % de la section totale. Les éléments de cette configuration affichent un rendement de séparation quasi équivalent à celui obtenu au moyen de membranes seules. Les éléments objets de l'invention sont utiles en osmose inverse, ultrafiltration, perméation gazeuse et autres techniques séparatives où le gradient de pression est maintenu à travers la membrane jusque dans la zone du perméat.

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