Ultrafiltration membranes: Pore structure characterization by liquid-liquid porometry

V. Davey*, K. Gupta, PMI Porous Materials, Inc., USA

Ultrafiltration membranes are currently being used in a wide variety of industries including drinking water, disinfection, food, beverage, pharmaceutical, waste water treatment, detoxification, health care, blood treatment and protein concentration. Pores of ultrafiltration membranes are about 40 to 20 nm in diameter. Such membranes are capable of acting as barriers to bacteria, viruses, spores, pollens, colloidal suspensions, high molecular weight solutes, pathogens and pesticides. Pore structure characteristics relevant for such applications include through pore throat diameter, bubble point pore diameter, mean flowpore diameter, pore distribution and liquid permeability. Capillary flow porometry (CFP), which is widely used for measurement of such pore structure characteristics requires very high test pressures. High test pressures tend to distort the pore structure and damage or rupture membranes. A new technique, Liquid-Liquid Porometry (LLP) can measure the required pore structure characteristics without damaging membranes. PMI has mastered LLP over the last 2 decades. This paper explains and provides insight on the theory and working of a PMI Liquid-Liquid Porometer.

Session: L11 / F1- Short Oral + Poster Presentations
Day: 12 October 2016
Time: 14:45 - 16:45 h

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