A Novel Approach to Gas Separations Using Composite Hollow Fiber Membranes

Henis, J. M. S.; Tripodi, Mary K.

doi:10.1080/01496398008076287

Cited by 182 publications

(80 citation statements)

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“…1,19,20 In view of its good thermostability, excellent mechanical and fiber spinning properties, and chemical resistance, it was the first commercially available polymer to be used for the fabrication of commercial hollow fiber gas separation membranes for H 2 /N 2 and O 2 /N 2 separation. 21 Some relevant previous work to the present work has been done whereby parallel families of polysulfones with † NRCC No. 46459.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

Dai¹,

Guiver²,

Robertson³

et al. 2004

Macromolecules

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/npsi/ctrl?action=rtdoc&an=8906267&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8906267&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1021/ma035739i Macromolecules, 37, 4, pp. 1403Macromolecules, 37, 4, pp. -1410Macromolecules, 37, 4, pp. , 2004 Preparation and characterization of polysulfones containing both hexafluoroisopropylidene and trimethylsilyl groups as gas separation membrane materials Dai, Y.; Guiver, Michael; Robertson, Gilles; Kang, Y.; Lee, Kunchan; Jho, J. Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea; and Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, Seoul 151-744, Korea Received November 19, 2003; Revised Manuscript Received December 16, 2003 ABSTRACT: Trimethylsilylated derivatives of hexafluoropolysulfone (6FPSf) and tetramethylhexafluoropolysulfone (TM6FPSf) were prepared by reaction of lithiated polymer intermediates with halotrimethylsilane electrophiles for a membrane gas separation study to compare improvements in gas permeabilities with those of unmodified polymers. Ortho sulfone substituted 6FPSf and TM6FPSf having pendant trimethylsilyl (TMS) groups were obtained by a two-step process involving first direct lithiation of 6FPSf and TM6FPSf solutions with n-butyllithium to afford ortho sulfone dilithiated intermediates, followed by reaction with a TMS electrophile. The corresponding ortho ether 6FPSf derivative was obtained by lithiation of dibrominated 6FPSf at the bromine sites, followed by reaction with a TMS electrophile. The degree of substitution (DS) of the TMS groups was g2.0 and was dependent on the molar ratio of n-butyllithium and electrophile quantity, electrophile reactivity, and reaction conditions. Detailed structural characterization and DS of the modified polymers were obtained by nuclear magnetic resonance spectroscopy. The glass transition temperatures and thermal stabilities were determined by differential scanning calorimetry and thermogravimetric analysis, respectively. Polymer chain d-spacing was investigated using wide-angle X-ray diffraction. Polymer free volume was calculated from the polymer density and specific van der Waals volume. The polymer gas permeability coefficients (P) were measured for He, CO 2,O 2, and N2. Both CO2 and O2 permeabilities of modified 6FPSf increased by 8-9-fold (P(CO2) ) 110 barre...

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

Dai¹,

Guiver²,

Robertson³

et al. 2004

Macromolecules

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“…Since the first commercial polymeric membrane system was developed for hydrogen recovery by Monsanto in the 1980s [67], the applications of the polymeric membrane system have been extended to many hydrogen separation plants, including gas ratio adjustment for syngas and hydrogen recovery from refinery gases, and they are expected to be utilized for proton-exchange membrane (PEM) fuel cells, biomass processing, etc., in the future [35]. Table 3 provides information on the first commercial polymeric membranes for hydrogen separation.…”

Section: Current Utilization Status and Future Perspectives For Biomamentioning

confidence: 99%

A Review on the Production and Purification of Biomass-Derived Hydrogen Using Emerging Membrane Technologies

Yin

Yip

2017

Catalysts

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Abstract:Hydrogen energy systems are recognized as a promising solution for the energy shortage and environmental pollution crises. To meet the increasing demand for hydrogen, various possible systems have been investigated for the production of hydrogen by efficient and economical processes. Because of its advantages of being renewable and environmentally friendly, biomass processing has the potential to become the major hydrogen production route in the future. Membrane technology provides an efficient and cost-effective solution for hydrogen separation and greenhouse gas capture in biomass processing. In this review, the future prospects of using gas separation membranes for hydrogen production in biomass processing are extensively addressed from two perspectives: (1) the current development status of hydrogen separation membranes made of different materials and (2) the feasibility of using these membranes for practical applications in biomass-derived hydrogen production. Different types of hydrogen separation membranes, including polymeric membranes, dense metal membranes, microporous membranes (zeolite, metal-organic frameworks (MOFs), silica, etc.) are systematically discussed in terms of their fabrication methods, gas permeation performance, structure stability properties, etc. In addition, the application feasibility of these membranes in biomass processing is assessed from both practical and economic perspectives. The benefits and possibilities of using membrane reactors for hydrogen production in biomass processing are also discussed. Lastly, we summarize the limitations of the currently available hydrogen membranes as well as the gaps between research achievements and industrial application. We also propose expected research directions for the future development of hydrogen gas membrane technology.

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“…It was the first commercial polymer used for fabricating gas separation membranes in the form of hollow fibers for the separation of H 2 and the production of N 2 because of its overall combination of adequate gas permeabilities and relatively high permselectivities to various gas pairs as well as its good mechanical properties for fiber spinning. 5 The previous work most relevant to the present work was by Koros and Paul whereby parallel families of polysulfones with systematic structural modifications were correlated with their gas separation properties. [6][7][8][9][10] Both tetramethylpolysulfone (TMPSf) and hexafluoropolysulfone (6FPSf) are more permeable than PSf but maintain comparable permselectivity for many gas pairs 9,10 because tetramethyl and hexafluoroisopropylidene groups sterically hinder both bond rotation and intersegmental packing.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in the Gas Permeabilities of Novel Polysulfones with Pendant 4-Trimethylsilyl-α-hydroxylbenzyl Substituents

et al. 2003

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A series of modified polymers with 4-trimethylsilyl-R-hydroxylbenzyl (HBTMS) substituents were made as new materials for membrane gas separation. HBTMS was introduced onto polysulfone (PSf), tetramethylpolysulfone (TMPSf), and hexafluoropolysulfone (6FPSf) by forming lithiated polymer intermediates followed by treatment with an electrophile, p-trimethylsilylbenzaldehyde. The resulting side substituent contains the bulky trimethylsilyl (TMS) groups separated from the polymer chain by an aromatic ring. The polymer structures were characterized by NMR spectroscopy, and thermal properties were investigated by differential scanning calorimetry and thermogravimetry. The permeability coefficients of the resulting polymers PSf-HBTMS, TMPSf-HBTMS, and 6FPSf-HBTMS showed considerable increases over the unmodified polymers. TMPSf-HBTMS showed the greatest improvements in gas transport properties with large increases in both CO 2 and O2 permeabilities of ∼3-fold (72 and 18 Barrers, respectively) compared with TMPSf. In the case of the CO2/N2 gas pair, there was an absence of the typical accompanying tradeoff shown by decreases in permselectivity with increasing permeability. Comparisons of this series of polymers containing the new HBTMS substituent were made with those having other TMS pendant groups.

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A Novel Approach to Gas Separations Using Composite Hollow Fiber Membranes

Cited by 182 publications

References 3 publications

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

A Review on the Production and Purification of Biomass-Derived Hydrogen Using Emerging Membrane Technologies

Enhancement in the Gas Permeabilities of Novel Polysulfones with Pendant 4-Trimethylsilyl-α-hydroxylbenzyl Substituents

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