Liquid purification or separation – Casing divided by membrane into sections having inlet – Each section having inlet
Patent
1990-09-19
1992-03-17
Sever, Frank
Liquid purification or separation
Casing divided by membrane into sections having inlet
Each section having inlet
21032183, 2104971, B01D 6310
Patent
active
050965840
ABSTRACT:
The present invention relates to a spiral-wound membrane module having a semi-permeable membrane which has a central high pressure premeatae region flanked on opposite sides by two lower pressure edge portions. The edge portions facilitate the dispersion of and the collection of the feed fluid being treated and assist in obtaining a more uniform flow of the feed fluid through the high pressure region of the membrane. In one embodiment, the module has entrance and exit flow means for a counter-current flow of a sweep fluid through the permeate. Preferably, the high pressure permeate region is a high density porous spacer flanked on two sides with low density porous spacers. In one embodiment, the higher pressure permeate region and flanking low pressure drop permeate regions are obtained by specifically positioned lines of adhesive or glue spots (or lines) having a specific size and spacing. Generally the spots (or lines) are positioned in a generally axial configuration to the central pipe. Generally, the glue spots or lines are positioned in the permeate passageway in a pattern to obtain controlled flow of the countercurrent, cocurrent, or crosscurrent sweep fluid.
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Denslow Keith
Reddy Damoder
Sever Frank
The Dow Chemical Company
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