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Titre :
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Pervaporation dehydration of C2–C4 alcohols by 6FDA-ODA-NDA/Ultem® dual-layer hollow fiber membranes with enhanced separation performance and swelling resistance (2010)
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Auteurs :
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Natalia Widjojo, Auteur ;
Tai-Shung Chung, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Chemical engineering journal (Vol. 155 N° 3, Decembre 2009)
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Article en page(s) :
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pp. 736-743
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Note générale :
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Génie Chimique
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Langues :
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Anglais
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Index. décimale :
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660
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Tags :
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Dual-layer hollow fiber membranes Pervaporation Alcohol dehydration Separation factor Flux
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Résumé :
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A novel copoly(4,4′-diphenyleneoxide/1,5-napthalene-2,2′-bis (3,4-dicarboxyl phenyl) hexa fluoro propane diimide) 6FDA-ODA-NDA/Ultem® 1010 dual-layer hollow fiber membrane for pervaporation dehydration has been fabricated via co-extrusion process. Not only can it achieve impressive alcohol dehydration performance without any post-treatment but also it particularly minimizes the membrane's swelling behavior towards aqueous alcohol solution. For isopropanol, n-butanol and t-butanol dehydrations of 85/15 (alcohol/water) wt.% feed solutions, the 6FDA-ODA-NDA/Ultem® 1010 dual-layer hollow fiber membrane can successfully attain permeate containing more than 99.7 wt.% water with considerably high flux which implies to a distinctive separation factor of the respective alcohol system. The outstanding dehydration performance of 6FDA-ODA-NDA/Ultem® 1010 dual-layer hollow fiber membranes on various aqueous alcohol feeds can be attributed to: (1) a precise formulation of the outer- and inner-layer dope compositions; (2) the size of d-space created in the outer-layer is a good match for size exclusion mechanism in the alcohol dehydration systems; (3) a relatively low water uptake and less swelling characteristics of the Ultem® 1010 polyimide as a supporting layer. By adjusting spinning parameters, i.e. outer-layer dope flow rate and air gap distance, the separation performance of 6FDA-ODA-NDA/Ultem® 1010 dual-layer hollow fiber membranes can be further improved.
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DEWEY :
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660
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ISSN :
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1385-8947
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En ligne :
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http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X7GMP2-4&_user=6909337&_coverDate=12%2F15%2F2009&_rdoc=24&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235228%232009%23998449996%231562277%23FLA%23display%23Volume%29&_cdi=5228&_sort=d&_doc
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