Abstract
Highly permeable porous alumina (Al2O3) hollow fiber membranes have been developed by a combined phase inversion and sintering technique. Ethanol substituting for water was used as the external coagulant in order to prepare Al2O3 hollow fiber membranes with low trans-membrane resistance. The prepared Al2O3 membranes show a special asymmetric structure with an outer skin layer, highly porous inner surface and sub-layer composed of long and large finger-like pores. The influences of sintering temperature on the average pore size, N2 permeability and bending strength were investigated. Results show that Al2O3 hollow fiber membranes with higher permeability can be prepared using ethanol as the external coagulant. The prepared Al2O3 hollow fiber membranes show a N2 permeability of 871.5 m3·m-2·h-1·bar-1 and a bending strength of 91.4 MPa when sintered at 1550°C for 5h.
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