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Modification of crosslinked chitosan membrane using NaY zeolite for pervaporation separation of water-isopropanol mixtures

Premakshi, HG and Ramesh, K and Kariduraganavar, MY (2015) Modification of crosslinked chitosan membrane using NaY zeolite for pervaporation separation of water-isopropanol mixtures. In: CHEMICAL ENGINEERING RESEARCH & DESIGN, 94 . pp. 32-43. (Submitted)

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Official URL: http://dx.doi.org/10.1016/j.cherd.2014.11.014

Abstract

The blocked diisocyanate crosslinked chitosan membrane was modified by incorporating different mass% of NaY zeolite. The physico-chemical properties of resulting composite membranes were studied using Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The mechanical properties of the membranes were studied using universal testing machine (UTM). After measuring the equilibrium swelling, membranes were subjected to pervaporation for separation of water-isopropanol mixtures. Both flux and selectivity were increased with increasing NaY zeolite content in the membranes. The membrane containing 40 mass% of NaY zeolite exhibited the highest separation selectivity of 11,241 with a flux of 11.37 x 10(-2) kg/m(2) h for 10 mass% of water in the feed. The total flux and flux of water are almost overlapping each other, suggesting that these membranes could be effectively used to break the azeotropic point of water-isopropanol mixture. From the temperature dependent diffusion and permeation values, the Arrhenius activation parameters were estimated. All the composite membranes exhibited lower activation energy compared to crosslinked membrane, indicating that the permeants require less energy during the process because of molecular sieving action attributed to the presence of sodalite and super cages in the framework of Nay zeolite. The Henry's mode of sorption dominates the process, giving an endothermic contribution. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: CHEMICAL ENGINEERING RESEARCH & DESIGN
Publisher: INST CHEMICAL ENGINEERS
Additional Information: Copy right for this article belongs to the INST CHEMICAL ENGINEERS, 165-189 RAILWAY TERRACE, DAVIS BLDG, RUGBY CV21 3HQ, ENGLAND
Keywords: MIXED MATRIX MEMBRANES; POLY(VINYL ALCOHOL); SODIUM ALGINATE; ACETIC-ACID; DEHYDRATION; PERMEATION; LINKING
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 24 Apr 2015 06:02
Last Modified: 24 Apr 2015 06:02
URI: http://eprints.iisc.ac.in/id/eprint/51389

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