Pervaporation separation of toluene/alcohol mixtures using silicalite zeolite embedded chitosan mixed matrix membranes

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• 作者：Mallikarjunagouda B. Patil ; Tejraj M. Aminabhavi
• 关键词：Pervaporation ; Mixed matrix membrane ; Silicalite ; Zeolite
• 刊名：Separation and Purification Technology
• 出版年：2008
• 出版时间：1 August 2008
• 年：2008
• 卷：62
• 期：1
• 页码：128-136
• 全文大小：826 K

文摘

Mixed matrix membranes (MMMs) of chitosan were prepared by incorporating silicalite zeolite particles in 5 and 10 wt. % with respect to weight of chitosan polymer to improve their pervaporation (PV) separation characteristics over that of pristine chitosan membrane for toluene/methanol and toluene/ethanol feeds in compositions of 10–40 wt. % of toluene at 30 °C. The membranes were crosslinked with glutaraldehyde (GA), which was confirmed by Fourier transform infrared spectroscopy (FTIR) and ion exchange capacity (IEC) measurements. X-ray diffraction (X-RD) and scanning electron microscopic (SEM) studies were performed to understand membrane morphology. Toluene permeated preferentially with a selectivity of 264 and fluxes of 0.019–0.027 kg/m² h for toluene/methanol mixture. Selectivity of 301 with fluxes ranging from 0.019 to 0.026 kg/m² h was observed for toluene/ethanol mixtures. Flux increased, while selectivity decreased with increasing toluene content of the feeds. An increase in silicalite content of the MMMs gave increased PV performances.