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Spiral-wound membrane with improved permeate carrier
| Details |
Inventors: Lien, Larry A.;
Assignee: Desalination Systems, Inc. (Escondido, CA)
Primary Examiner: Spear; Frank
Assistant Examiner:
Attorney, Agent or Firm: Fitch, Even, Tabin & Flannery
Disclosed are spiral-wound membrane cartridge constructions for use in ultrafiltration and reverse-osmosis separation equipment. The membrane constructions include a membrane layer directly bonded to a permeate carrier layer characterized by a channel material having a plurality of parallel ribs extending in a transverse permeate-carrying direction, interconnected by a relatively thin matrix of smaller fibrils. It advantageously reduces resistance to permeate flow to a central collection point, and can be employed to separate both liquid and gaseous fluids. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a filtration module constructed from a minimum number of layers of different materials, and exhibiting improved side pressure loss, and more particularly having side pressure losses lower than those commonly experienced with systems using a Tricot carrier material.
Another object of the present invention is to provide a filtration module of the above-described type which is spirally wound into a compact, generally cylindrical package.
These and other objects of the present invention which will become apparent from studying the appended description and accompanying drawings are provided in a membrane cartridge for separating a first component from a fluid mixture of the first component and a second component.
As used herein, the term "fluid" refers to gases as well as liquids.
The cartridge consists of a porous, sheet-like membrane having pores sized to allow passage of the first fluid component in a generally transverse direction, while rejecting passage of the second fluid component therethrough.
A permeate carrier layer of structured, non-random, non-woven channel material having a plurality of generally parallel ribs on its surface, forms permeate-carrying channels extending in a preselected direction of exit flow.
The carrier further includes conduit means for conducting the exit flow of the first component permeate away from the channels.
In one embodiment, the permeate carrier layer is characterized by an ordered structure consisting of plurality of spaced, generally parallel ribs of preselected size forming the channels between adjacent pairs thereof, the ribs being interconnected by a web-like matrix of much smaller fibrils.
In one embodiment, a leaf formed of the membrane and permeate carrier layer is joined to and wound spirally about the conduit means, together with a sheet of porous supply material.
The leaf comprises a composite layer of the membrane adhering to the permeate carrier layer and folded at an outer edge remote from the conduit means, so as to create a sandwich of two layers of the permeate carrier in contact with each other between two outer sheets of membrane
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Liquid Purification 
