Micro & ultrafiltration membranes: pore size characterization by liquid-liquid porometry and bubble point tester

K. Gupta*, Porous Materials Inc., USA

Filtration membranes are capable of acting as barriers to bacteria, viruses, spores, pollens, colloidal suspensions, high molecular weight solutes, pathogens and pesticides. Pore structure characterisation of these include through pore throat diameter, bubble point pore diameter, mean flow pore diameter, pore distribution and liquid permeability.

Liquid Liquid Porometery is used as a novel technique for measuring pores in the Ultrafiltration range without any damage or rupture to the membrane. Liquid Liquid Porometer uses two immiscible & saturated wetting liquids . Pores are filled with first liquid and second liquid is pressurized to displace the first liquid and flow through the pores. The amount of liquid flowing out is measured. Second liquid flow rate and differential pressure are measured. Pore distributions are computed like those in Capillary Flow Porometer

The limitation of measurement of bubble point in a liquid –liquid Porometer is overcome by using Liquid Expulsion technique for measurement of first flow to determine bubble point. The combination of Liquid Liquid Porometer and Bubble Point Tester provides an ideal tool for determining pore distribution of micro & ultrafiltration membranes.

Session: L10 - Short Oral + Poster Presentations
Day: 14 March 2018
Time: 14:45 - 16:45 h

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