Membrane module for hyperfiltration or ultrafiltration of containating liquid flows
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United States of America Patent
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Oct 10, 1989
Grant Date -
N/A
app pub date -
Sep 9, 1988
filing date -
Sep 9, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A membrane module for hyperfiltration or ultra filtration of liquid flows comprises a membrane envelope (1) spirally wound around a tube (4) provided with openings and the membrane layers of which are alternately kept at a distance from each other by retentate spacers and permeate spacers (2), which retentate spacers comprise relatively rigid rods or wires (3) extending parallel to the center line of the module. In order to obtain a very constant and defined geometry of the retentate flow channels and a favorable ratio between membrane surface and module volume, the width dimension of the rods measured perpendicular to the membrane layers is 0.5 to 2.5 mm and the distance between the rods is 4 to 12 times said width dimension. Said width dimension of the rods measured perpendicular to the membrane layers should be at least three times the diameter of the largest particles in the liquid flow to be filtered.
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