Manufacture of membranes for desalination and filtration

Details Manufacture of membranes for desalination and filtration Manufacture of membranes for desalination and filtration

B - Operations, Transporting

01

D

B01D 69/06 (2006.01) B01D 63/10 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2602759

A spiral wound membrane is disclosed which comprises an elongate web of a material which allows water to pass through but inhibits the passage of solids and/or dissolved solids. The web has been folded to zig-zag form to produce a stack of layers (68.1 , 68.2 etc.) joined to one another by reverse bends (72, 74). A perforated tube (18) is provided, the ends of the web forming the stack being secured to the tube. The stack is wound around the tube and there are spacers (58, 62) between the layers, (68.1 , 68.2 etc.). The spacers hold the layers apart to form water flow passages (56, 60). Alternate water flow passages (60) have the ends thereof transverse to the bends (72, 74) sealed closed. These passages are also closed by reverse bends (74) at the radially outer ends thereof. Along their radially inner edges thereof these passages are in communication with the perforations (54) of the tube (20). Strengthening tapes (70) are provided inside the bends (72, 74).

L~invention concerne une membrane enroulée en spirale comprenant une bande allongée d~un matériau qui laisse passer l~eau, mais empêche le passage de solides et/ou de solides dissous. La bande a été pliée en forme de zig-zag afin d~obtenir une pile de couches (68.1, 68.2 etc.) reliées entre elles par des coudes inversés (72, 74). Un tube perforé (18) est prévu, les extrémités de la bande formant la pile étant fixées au tube. La pile est enroulée autour du tube et des espaceurs (58, 62) se trouvent entre les couches (68.1, 68.2 etc.). Les espaceurs maintiennent les couches séparées afin de créer des passages d~écoulement pour l~eau (56, 60). Les passages alternatifs d~écoulement pour l~eau (60) présentent des extrémités disposées de manière transversale aux coudes (72, 74) fermées hermétiquement. Ces passages sont également fermés par des coudes inversés (74) à leurs extrémités extérieures radiales. Ces passages communiquent le long de leurs bords intérieurs radiaux avec les perforations (54) du tube (20). Des bandes de renforcement (70) sont prévues à l~intérieur des coudes (72, 74).

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