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In order to improve the large membrane resistance of symmetric conventional porous glass membrane in microfiltration, new asymmetric type of porous glass membrane was prepared by use of two kinds of NaO-CaO-Al2O3-B2O3ZrO2-SiO2 glass with different growth rate of phase separation, and was characterized for separative membrane. Growth rate of separated phase from the primary glass composition decreased with increasing content of Al2O3. Therefore, Al2O3-rich glass and Al2O3-poor glass were laminated in two layers to be formed into a tube. The primary glass tube was thermal-treated to cause the phase separation, and the separated phase was leached out with an acid. Both skin layer and support layer of the asymmetric porous glass membrane had the uniformly controlled pore size. Skin layer with 15 i m in thickness was formed inside the membrane. The pure water flux through the asymmetric porous glass membrane were much higher about 10 times of that through conventional symmetric porous glass membrane, because of decreasing of membrane resistance. The flux in crossflow microfiltration of acrylic resin suspension were much higher about 2 times of those through symmetric membrane. High permeability of the asymmetric porous glass membrane was confirmed through these measurements.

Preparation of new asymmetric type of porous glass membrane and effect of its structure on microfiltration.