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US 5,114,582 AGranted
Filter element and spiral-wound membrane cartridge containing same
AssigneeW. R. Grace & Co.-Conn.
InventorsEric L. Sandstrom, Alfred Prokop, William H. Young, II, Anthony M. D'Urso
Life of this patent
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Abstract
An improved spiral membrane cartridge is provided, comprising one or more filter elements, spirally wound on a cylindrical permeate transport tube. Each filter element comprises a heat-sealed membrane element and a feed spacer. The spiral membrane cartridge of the invention contains no adhesives, improving the reliability and durability of the cartridge. The invention further provides a method for making such an improved membrane cartridge, and the membrane elements used therein.
Claims12
A spiral wound membrane cartridge comprising:
- a) a cylindrical permeate transport tube having a plurality of axial apertures;
- b) at least one filter element spirally wound around said permeate transport tube, said filter element comprising:
- i) a feed spacer;
- and
- ii) a membrane element comprising a first membrane having a membrane surface and a heat-sealable backing surface with a permeate port heat sealed thereto, a second membrane having a membrane surface and a heat-sealable backing surface, and a permeate carrier layer interposed between the backing surfaces of the first and second membranes, wherein the membranes are heat sealed together around their entire periphery;
- wherein the filter element is wound around the permeate transport tube such that the permeate port sealingly engages one of the axial apertures therein in order that sealed fluid communication is established between the permeate carrier layer of the membrane element and the permeate transport tube.
3 more elements
Dependencies are inferred from the claim text.