Title of article :
Pervaporation of water–ethanol and methanol–MTBE mixtures using poly (vinyl alcohol)/cellulose acetate blended membranes
Author/Authors :
Ke Zhou، نويسنده , , Qiu Gen Zhang، نويسنده , , Guang Lu Han، نويسنده , , Ai Mei Zhu، نويسنده , , Qing Lin Liu، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
9
From page :
93
To page :
101
Abstract :
Poly (vinyl alcohol) (PVA) and cellulose acetate (CA) are widely used as membrane materials. Here PVA/CA blended membranes were prepared over a range of 0–100 wt% CA loading, and applied to separate water–ethanol and methanol–methyl tert-butyl ether (MTBE) mixtures by pervaporation. They were characterized by tensile strength testing, contact angle metering and wide angle X-ray diffraction (XRD), scanning electron microscopy (SEM) and positron annihilation lifetime spectroscopy (PALS). Phase separation was observed from the membrane cross-section. As the CA loading increases, the radius of free volume cavity and fractional free volume of the blended membranes increase simultaneously. The as-prepared blended membranes exhibit good separation performance in pervaporation of water (15 wt%)–ethanol and methanol (15 wt%)–MTBE mixtures. Blending has improved permeability of the PVA membrane and selectivity of the CA membrane. The total flux greatly increases whereas separation factor falls with increasing CA loading. The permeances of water and methanol are higher than 8000 gpu and continually increase with CA loading. The results will provide guidance and reference for designing high efficient polymer blended membranes.
Keywords :
Pervaporation , Water–ethanol mixture , Methanol–MTBE mixture , Poly (vinyl alcohol) , Cellulose acetate
Journal title :
Journal of Membrane Science
Serial Year :
2013
Journal title :
Journal of Membrane Science
Record number :
1360111
Link To Document :
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