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US 5,538,642 AGranted
Spiral wound membrane element
AssigneeThe Dow Chemical Company
InventorGregory D. Solie
Life of this patent
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Abstract
Spiral wound membrane elements have permeate flow channels attached to a porous polymeric mandrel in a regular and closely spaced array. The permeate flow channels are attached to the mandrel by means of ultrasonic welding. The attaching means permits the attachment of a high density of permeate flow channels.
Claims11
A spiral wound semi-permeable membrane element for axial feed fluid path comprising:
- a. a porous hollow core mandrel,
- b. a plurality of discontinuous permeate sheet spacer channels affixed to the hollow core mandrel at a rate of at least 0.7 sheet spacer channels per centimeter of mandrel circumference by ultrasonic welding,
- c. semi-permeable membrane sheet substantially coextensive with the major surfaces of each permeate fluid spacer sealed at the axial edges, radially proximal edge and radially distal edge, so as to enclose each major surface, the axial edges and the radially distal edge of each permeate sheet spacer channel within a membrane envelope,
- d. a plurality of discontinuous feed fluid spacers interspersed between membrane envelopes for axial flow of feed fluid.
1 more element
Dependencies are inferred from the claim text.