Abstract
Thermal crosslinking sequential method applied for DN-PVAs generation efficiently. The swelling measurements investigated that the hydrophilicity of the membrane decreases because of the collaboration of the second thermal crosslinked PVA matrix. The dehydration performance of ethanol solution showed improved using the thermal crosslinked double network PVA membrane. The pervaporation dehydration of the water-ethanol mixture was investigated at different conditions. The separation selectivity showed a significant improvement, while the permeation flux declines due to the incorporation of the second PVA network under 95 % ethanol and at 40 °C. Increasing the feed temperature enhanced the permeability of the membrane, while decreasing the water content in the feed resulted in an increase in the selectivity. The overall results showed that, at high operating temperature and high ethanol concentration in the feed, the prepared membranes are highly selective towards the water with reasonable fluxes values. The influence of temperature permeation parameter and diffusion coefficient of the feed component is also discussed. The negative heat of sorption ( ∆Hs ) values calculated on the basis of the estimated Arrhenius activation energy values indicates that the sorption process is controlled by Langmuir's mode.
Highlights
It is well known that bio-fuels including bio-ethanol have several environmental benefits
The separation selectivity showed a significant improvement, while the permeation flux declines due to the incorporation of the second Poly(vinyl alcohol) (PVA) network under 95 % ethanol and at 40 °C
That's why, 4 Conclusions In this work, thermal crosslinking is applied for DN-PVAs generation efficiently
Summary
It is well known that bio-fuels including bio-ethanol have several environmental benefits. Absolute ethanol containing 99.5 % (by mass) or more ethanol is in the greatest demand [1]. Ethanol was used to be dehydrated by the distillation separation process. High costs, low productivity are recognized as challenging problems leading to a crucial disadvantage and result in increasing the costs of the process essentially the industrial production of highly concentrated bioethanol [2, 3]. Pervaporation technology (PV) has received much attention due to its potential in energy efficiency, simplicity, economically friendly and high efficiency of separation [4,5,6]. The mechanism of the pervaporation is usually explained with the so-called solution-diffusion model. When the feed mixture is in direct contact with the membrane surface, one component of the liquid mixture is selectively adsorbed/
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