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Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation / May May Teoh in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14046–14054 Titre : Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation Type de document : texte imprimé Auteurs : May May Teoh, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2012 Article en page(s) : pp. 14046–14054 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Multichannel  Rectangular  Membranes Résumé : In this study, poly(vinylidene fluoride) (PVDF) multichannel rectangular membranes were spun through the non-solvent-induced phase separation method with the aid of a specially designed spinneret. This unique spinneret has an outer rectangular slit and seven inner needles arranged in series. The newly designed membranes have the combined advantages offered by (1) hollow fiber (i.e., high membrane area per volume ratio and easy assembly into membrane modules); (2) flat sheet membranes (i.e., greater mechanical durability and compressibility); and (3) woven or nonwoven spacers used in flat sheet modules (as mechanical supports). Microscopic views and scanning electron microscopy (SEM) microphotographs show an irregular inner contour align symmetrically in the hydrophobic PVDF membrane. Multichannel rectangular membranes with a grooved pattern have the following advantages: (1) easy handling, (2) can be acted as spacers to discrete membrane from attaching together, and (3) creating eddies flow at the membrane outer selective layer. Attempts are also made to understand the deformation of grooved outer surface and irregular inner contour. Apart from interesting membrane geometry, this study also explores the prospect of utilizing aforementioned membranes for seawater desalination via direct contact membrane distillation (DCMD). A promising distillated flux of 54.7 kg m–2 s–1, using a hot feed brine solution of 80 °C, is obtained through these newly spun multichannel rectangular membranes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201292j [article] Development of Novel Multichannel Rectangular Membranes with Grooved Outer Selective Surface for Membrane Distillation [texte imprimé] / May May Teoh, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur . - 2012 . - pp. 14046–14054. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14046–14054 Mots-clés : Multichannel  Rectangular  Membranes Résumé : In this study, poly(vinylidene fluoride) (PVDF) multichannel rectangular membranes were spun through the non-solvent-induced phase separation method with the aid of a specially designed spinneret. This unique spinneret has an outer rectangular slit and seven inner needles arranged in series. The newly designed membranes have the combined advantages offered by (1) hollow fiber (i.e., high membrane area per volume ratio and easy assembly into membrane modules); (2) flat sheet membranes (i.e., greater mechanical durability and compressibility); and (3) woven or nonwoven spacers used in flat sheet modules (as mechanical supports). Microscopic views and scanning electron microscopy (SEM) microphotographs show an irregular inner contour align symmetrically in the hydrophobic PVDF membrane. Multichannel rectangular membranes with a grooved pattern have the following advantages: (1) easy handling, (2) can be acted as spacers to discrete membrane from attaching together, and (3) creating eddies flow at the membrane outer selective layer. Attempts are also made to understand the deformation of grooved outer surface and irregular inner contour. Apart from interesting membrane geometry, this study also explores the prospect of utilizing aforementioned membranes for seawater desalination via direct contact membrane distillation (DCMD). A promising distillated flux of 54.7 kg m–2 s–1, using a hot feed brine solution of 80 °C, is obtained through these newly spun multichannel rectangular membranes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201292j

Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent / Ding Yu Xing in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8761–8769 Titre : Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent Type de document : texte imprimé Auteurs : Ding Yu Xing, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2010 Article en page(s) : pp. 8761–8769 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic  liquid Résumé : Ionic liquids have gained worldwide attention as green solvents in the past decade. This study explores, for the first time, the fundamental science and engineering of using ionic liquids as a new generation of solvents to replace traditional organic solvents for the fabrication of flat sheet membranes and hollow fiber membranes. The fundamentals and characteristics of membrane formation of cellulose acetate (CA) membranes have been investigated using 1-butyl-3-methylimidazolium thiocyanate ([BMIM]SCN) as the solvent via phase inversion in water. For elucidation, other solvents, i.e., N-methyl-2-pyrrolidinone (NMP) and acetone, were also studied. It is found that [BMIM]SCN has distinctive effects on phase inversion process and membrane morphology compared to NMP and acetone because of its unique nature of high viscosity and the high ratio of [BMIM]SCN outflow to water inflow. Membranes cast or spun from CA/[BMIM]SCN have a macrovoid-free dense structure full of nodules, implying the paths of phase inversion are mainly nucleation growth and gelation, followed possibly by spinodal decomposition. The recovery and reuse of [BMIM]SCN have also been demonstrated and achieved. The derived flat sheet membranes made from the recovered [BMIM]SCN show morphological and performance characteristics similar to those from the fresh [BMIM]SCN. It is believed that this study could enrich the understanding of membrane formation using environmentally benign ionic liquids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007085 [article] Formation of cellulose acetate membranes via phase inversion using ionic liquid, [BMIM]SCN, as the solvent [texte imprimé] / Ding Yu Xing, Auteur ; Na Peng, Auteur ; Tai-Shung Chung, Auteur . - 2010 . - pp. 8761–8769. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8761–8769 Mots-clés : Ionic  liquid Résumé : Ionic liquids have gained worldwide attention as green solvents in the past decade. This study explores, for the first time, the fundamental science and engineering of using ionic liquids as a new generation of solvents to replace traditional organic solvents for the fabrication of flat sheet membranes and hollow fiber membranes. The fundamentals and characteristics of membrane formation of cellulose acetate (CA) membranes have been investigated using 1-butyl-3-methylimidazolium thiocyanate ([BMIM]SCN) as the solvent via phase inversion in water. For elucidation, other solvents, i.e., N-methyl-2-pyrrolidinone (NMP) and acetone, were also studied. It is found that [BMIM]SCN has distinctive effects on phase inversion process and membrane morphology compared to NMP and acetone because of its unique nature of high viscosity and the high ratio of [BMIM]SCN outflow to water inflow. Membranes cast or spun from CA/[BMIM]SCN have a macrovoid-free dense structure full of nodules, implying the paths of phase inversion are mainly nucleation growth and gelation, followed possibly by spinodal decomposition. The recovery and reuse of [BMIM]SCN have also been demonstrated and achieved. The derived flat sheet membranes made from the recovered [BMIM]SCN show morphological and performance characteristics similar to those from the fresh [BMIM]SCN. It is believed that this study could enrich the understanding of membrane formation using environmentally benign ionic liquids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007085