Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1994-01-28
1995-10-17
Noland, Thomas P.
Measuring and testing
With fluid pressure
Porosity or permeability
73 6455, G01N 1508
Patent
active
054579864
ABSTRACT:
A process is provided for rapidly and non-destructively evaluating the solute retention characteristics of porous membranes using a novel liquid-porosimetric technique. A ratio of two membrane permeabilities is measured at preselected operating conditions using a pair of mutually immiscible fluids, one of which is employed as a membrane wetting agent and the other used as an intrusion fluid. At the first operating condition, a particular transmembrane pressure is chosen so as to intrude nearly all of the pores present in the membrane sample. At the second operating condition, a particular membrane permeability is chosen so as to achieve a specified permeability ratio. The resulting transmembrane pressure corresponding to this particular membrane permeability is compared to a previously established standard curve which permits identifying the solute retention characteristics of the porous membrane.
REFERENCES:
patent: 4701861 (1987-10-01), Kauke
patent: 4872974 (1989-10-01), Hirayama et al.
patent: 4881176 (1989-11-01), Kononov
patent: 5064529 (1991-11-01), Hirayama et al.
Dileo Anthony J.
Phillips Michael W.
Cook Paul J.
Karnakis Andrew T.
Millipore Corporation
Noland Thomas P.
Wiggins J. David
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