Patent ID: 7691266

Claim:
A separation device comprising: a cylindrical separation pack including an axis and a porous medium spirally wound around the axis, wherein the porous medium has a feed side and a permeate side; a feed channel extending axially within the separation pack and including a shear region which extends axially along the feed side of the spirally wound porous medium; a plurality of permeate passages operatively associated with the shear region of the feed channel, the plurality of permeate passages extending along the permeate side of the porous medium opposite the shear region, wherein the porous medium is positioned between the shear region of the feed channel and the permeate passages and wherein the permeate passages are axially spaced and isolated from one another within the windings of the separation pack; a feed inlet fluidly communicating with the feed channel at one end; a retentate outlet fluidly communicating with the feed channel at another end; and a plurality of permeate outlets, each permeate outlet fluidly communicating with a permeate passage.