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A thermally regenerable novel ion-exchanger fabric for water desalination

Chanda, M and Modak, JM (2004) A thermally regenerable novel ion-exchanger fabric for water desalination. In: Journal of Polymer Materials, 21 (1). pp. 31-38.

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A fabric made of 100% acrylic fiber "Cashmilon" has been partially hydrolyzed to convert a fraction of its nitrile (-CN) groups to carboxylic acid (-COOH) groups and then gel-coated with 80% ethoxylated polyethyleneimine (EPEI) resin and cross-linked with glutaraldehyde to produce a novel sorbent in fabric form, containing weakly acidic and weakly basic groups in close proximity, that has been found to adsorb sodium chloride from brine water at ambient temperatures and desorb the salt completely at 80 degrees C, thus simulating the well-known Sirotherm (TM) resins used for desalination of waste water. Besides solution temperature, two other important factors affecting the magnitude of salt adsorption are the salt concentration and pH of the solution. In 0.5M sodium chloride solution at 30 degrees C and neutral pH, the maximum sorption is 76 mg NaCl per gram (dry) of the fabric-coated resin, which compares favorably with the capacity of commercial Sirotherm resins available in bead form.

Item Type: Journal Article
Publication: Journal of Polymer Materials
Publisher: Oxford & IBH Publication Co Pvt Ltd
Additional Information: Copyright for this article belongs to Oxford & IBH Publication Co Pvt Ltd.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 12 Dec 2005
Last Modified: 29 Jul 2016 06:22
URI: http://eprints.iisc.ac.in/id/eprint/4431

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