Synthesis and evaluation of ceramic-supported chitosan-silica membranes for pervaporation ethanol dehydration
Paper ID : 1302-MST2015-FULL
Mahdi Nikbakht1, Sepideh Soroush2, Morteza Asghari3, Mohammad Mehdi Montazer Rahmati *4
1University of Tehran
2Iran University of Science and Technology
3Separation Processes Research Group (SPRG), Department of Engineering, University of Kashan, Kashan, Iran
4School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
In the present work, ceramic-supported chitosan hybrid membranes were prepared for pervaporation dehydration of ethanol. Also, chitosan-silica composite membranes were prepared using 3-Aminopropyltriethoxysilane (APTEOS) as precursor by in situ sol-gel method. Mullite and combined mullite-alumina tubular ceramic supports were fabricated, and their influence on membrane performance was compared to a commercial α-alumina support. The membrane preparation parameters were the concentration of chitosan solution (varying from 2wt% to 4wt%) and the mass ratio of APTEOS to chitosan (varying from 0 to 15%). The hybrid membranes were characterized by ATR-IR spectroscopy, scanning electron microscopy (FE-SEM) and contact angle measurement. The results show, with increasing chitosan concentration, permeability decreases and selectivity increases. Silica nano particles were well distributed in the chitosan matrix and with increasing APTEOS content to 10% both permeability and selectivity increases. It was also found that the separation factor decreases with increasing feed temperature and feed water content, while the permeation flux increases. The membrane that was coated on α-alumina support with a 4wt% chitosan concenteration and 10% APTEOS content exhibited the best pervaporation performance, leading to a permeation flux and separation factor of 265 gr.m-2.h-1 and 5991 for 90wt% ethanol in feed at 60 ºC, respectively.
Chitosan, Ceramic supports, APTEOS, Mullite, Hybrid membrane, Pervaporation
Status : Paper Accepted (Poster Presentation)