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Pervaporation separation of xylene isomers by hybrid membranes of PAAS filled with silane - modified zeolite / Xin Y. Qu in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7504–7514 Titre : Pervaporation separation of xylene isomers by hybrid membranes of PAAS filled with silane - modified zeolite Type de document : texte imprimé Auteurs : Xin Y. Qu, Auteur ; Hang Dong, Auteur ; Zhi J. Zhou, Auteur Année de publication : 2010 Article en page(s) : pp. 7504–7514 Note générale : Industial chemistry Langues : Anglais (eng) Mots-clés : Hybrid  Membranes  Zeolite Résumé : Silicalite-1 zeolite was modified with 3-aminopropyltriethoxysilane (APTES) and then loaded into poly(acrylic acid) sodium (PAAS) to prepare PAAS/silicalite-1 hybrid pervaporation membranes for the separation of xylene isomer mixtures. Characterization by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopies confirmed that chemical modification on the zeolite surface had taken place. Based on sorption equilibrium experiments, the diffusion coefficients of permeates in the membrane were obtained, and the order of the diffusion coefficients of xylene isomers was found to be Do < Dm < Dp. An investigation of the effects of the original versus modified zeolite loading on the pervaporation performance was performed. With the original zeolite, the permeation flux of the binary xylene mixtures showed little change, whereas the selectivity of the hybrid membrane exhibited some enhancement. After modification of the zeolite surface, the selectivity of the hybrid membrane was clearly improved, the permeation flux of the membrane decreased slightly, and the maximum separation factors of the p-/o-xylyne (αp/o) and p-/m-xylene (αp/m) mixtures were determined to be 2.62 and 2.68, respectively. The experimental results revealed that the modification promoted the compatibility of the PAAS and silicalite-1 zeolite interface. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100256u [article] Pervaporation separation of xylene isomers by hybrid membranes of PAAS filled with silane - modified zeolite [texte imprimé] / Xin Y. Qu, Auteur ; Hang Dong, Auteur ; Zhi J. Zhou, Auteur . - 2010 . - pp. 7504–7514. Industial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7504–7514 Mots-clés : Hybrid  Membranes  Zeolite Résumé : Silicalite-1 zeolite was modified with 3-aminopropyltriethoxysilane (APTES) and then loaded into poly(acrylic acid) sodium (PAAS) to prepare PAAS/silicalite-1 hybrid pervaporation membranes for the separation of xylene isomer mixtures. Characterization by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopies confirmed that chemical modification on the zeolite surface had taken place. Based on sorption equilibrium experiments, the diffusion coefficients of permeates in the membrane were obtained, and the order of the diffusion coefficients of xylene isomers was found to be Do < Dm < Dp. An investigation of the effects of the original versus modified zeolite loading on the pervaporation performance was performed. With the original zeolite, the permeation flux of the binary xylene mixtures showed little change, whereas the selectivity of the hybrid membrane exhibited some enhancement. After modification of the zeolite surface, the selectivity of the hybrid membrane was clearly improved, the permeation flux of the membrane decreased slightly, and the maximum separation factors of the p-/o-xylyne (αp/o) and p-/m-xylene (αp/m) mixtures were determined to be 2.62 and 2.68, respectively. The experimental results revealed that the modification promoted the compatibility of the PAAS and silicalite-1 zeolite interface. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100256u

Recovery of petroleum ether from solanesol extracting solution through vacuum hydrophilic membrane distillation / Xin Y. Qu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9544–9551 Titre : Recovery of petroleum ether from solanesol extracting solution through vacuum hydrophilic membrane distillation Type de document : texte imprimé Auteurs : Xin Y. Qu, Auteur ; Lin Zhang, Auteur ; De S. Tang, Auteur Année de publication : 2009 Article en page(s) : p. 9544–9551 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Recovery  of  petroleum  ether  Solanesol  Membrane  distillation Résumé : The objective of this work is to study the feasibility of vacuum membrane distillation (VMD) by hydrophilic membranes to recover petroleum ether from the extracting solution of solanesol. Being different from the traditional membrane distillation (MD) process, hydrophilic membranes were used to avoid the membrane wetting for the nonaqueous solutions. The VMD performances of polyvinylidene fluoride (PVDF) membrane and two kinds of polyacrylonitrile (PAN) membranes with different structures were compared in the process of recovering petroleum ether. The results showed that good solvent flux (>15 kg/m2 h) and solanesol rejection (>98%) for the PAN membranes were obtained, indicating that PAN membranes had considerable potential use in this area, while the PVDF membrane was not appropriate for the nonaqueous solution system because of membrane wetting. The effects of operation conditions on VMD performances of the two PAN membranes were investigated, and it was found that high-feed temperatures, low-downstream pressures enhanced the permeate flux for both membranes, and the flux of PAN1 membrane decreased more obviously than that of PAN2 membrane under high-feed concentration because of its larger pore size. General models including Knudsen and viscous flows were proposed, and a good agreement between the experimental and the theoretical fluxes was obtained. Additionally, temperature and concentration polarizations were proved to have an obvious influence on mass transport of PAN1 membrane. It was advisable to work at the downstream pressure of 20 kPa, the feed temperature of 30 °C, and the feed flow rate of 27.5 mL/s to obtain favorable results for PAN2 membrane. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071499%2B [article] Recovery of petroleum ether from solanesol extracting solution through vacuum hydrophilic membrane distillation [texte imprimé] / Xin Y. Qu, Auteur ; Lin Zhang, Auteur ; De S. Tang, Auteur . - 2009 . - p. 9544–9551. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9544–9551 Mots-clés : Recovery  of  petroleum  ether  Solanesol  Membrane  distillation Résumé : The objective of this work is to study the feasibility of vacuum membrane distillation (VMD) by hydrophilic membranes to recover petroleum ether from the extracting solution of solanesol. Being different from the traditional membrane distillation (MD) process, hydrophilic membranes were used to avoid the membrane wetting for the nonaqueous solutions. The VMD performances of polyvinylidene fluoride (PVDF) membrane and two kinds of polyacrylonitrile (PAN) membranes with different structures were compared in the process of recovering petroleum ether. The results showed that good solvent flux (>15 kg/m2 h) and solanesol rejection (>98%) for the PAN membranes were obtained, indicating that PAN membranes had considerable potential use in this area, while the PVDF membrane was not appropriate for the nonaqueous solution system because of membrane wetting. The effects of operation conditions on VMD performances of the two PAN membranes were investigated, and it was found that high-feed temperatures, low-downstream pressures enhanced the permeate flux for both membranes, and the flux of PAN1 membrane decreased more obviously than that of PAN2 membrane under high-feed concentration because of its larger pore size. General models including Knudsen and viscous flows were proposed, and a good agreement between the experimental and the theoretical fluxes was obtained. Additionally, temperature and concentration polarizations were proved to have an obvious influence on mass transport of PAN1 membrane. It was advisable to work at the downstream pressure of 20 kPa, the feed temperature of 30 °C, and the feed flow rate of 27.5 mL/s to obtain favorable results for PAN2 membrane. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071499%2B