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Preparation and characterization of high-performance dehydrating pervaporation alginate membranes

✍ Scribed by Yanqiao Shi; Xinwei Wang; Guanwen Chen; Giovanni Golemme; Shimin Zhang; Enrico Drioli

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
188 KB
Volume
68
Category
Article
ISSN
0021-8995

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✦ Synopsis

In a previous work, sodium alginate dense membranes demonstrated a good combination of selectivity and permeation flux for dehydrating organic solvents by pervaporation. In this article, the pervaporation performances of alginate composite membranes has been investigated to find out the best condition of membrane formation and the optimum operating conditions. Some ultrafiltration membranes made of poly-(vinylidene fluoride), polyacrylonitrile, and hydrolyzed polyacrylonitrile-either commercially available or prepared in our laboratories-were used as supports for the composite membranes. Sodium alginate dense membranes, modified through ion exchange of sodium with multivalent metal ions (such as Al 3/ , Cr 3/ , Fe 3/ , and Mg 2/ ) have also been prepared, and their permselectivities have been tested for the waterethanol mixture. An interesting stability of the modified membranes in long-term operation is expected.

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