Patent ID: 6368505
Filing Date: 2002-04-09
Classification: B01D

Abstract:
In a cross-flow filter cassette comprising a multiplicity of adjacent filter cells wherein each cell consists of the elements (a) at least one retentate spacer forming a longitudinal flow channel for a fluid to be filtered, (b) a first membrane, (c) at least one permeate spacer forming a longitudinal permeate-collection channel, and (d) a second membrane wherein elements (a)-(d) have aligned holes forming three types of flow channels selected from (i) fluid feed channels, (ii) retentate discharge channels and (iii) permeate discharge channels, the improvement comprising the inclusion of at least one variable access retentate spacer wherein access to said aligned holes forming one type of flow channel is greater than the access to said aligned holes forming another type of flow channels.