Enhanced Matrimid membranes for pervaporation by homogenous blends with polybenzimidazole (PBI)

Chung, Tai‐Shung; Guo, Wei; Liu, Ye

doi:10.1016/j.memsci.2005.07.042

Cited by 90 publications

(37 citation statements)

References 30 publications

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“…Indeed, as water has a very high critical temperature, it competes very strongly with other penetrants for absorption sites in the Langmuir voids of the polymer [21]. In addition, if the polymer is hydrophobic or weakly hydrophilic, polar species such as water may interact with each other, preferentially to the polymer, resulting in the formation of water clusters [27].…”

Section: Water Vapor In Polymeric Membranesmentioning

confidence: 99%

“…In particular, it is the first time that these permeabilities have been evaluated at the same time under elevated feed pressures in a laboratory scale flat sheet membrane system. Two polyimides, typical of those used in natural gas separation [21], are used to understand the effect upon membrane performance of exposure to humidified methane and wetted carbon dioxide and methane mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Water vapor permeation in polyimide membranes

Chen

Scholes

Qiao

et al. 2011

Journal of Membrane Science

147

102

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Section: Water Vapor In Polymeric Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water vapor permeation in polyimide membranes

Chen

Scholes

Qiao

et al. 2011

Journal of Membrane Science

147

102

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“…Su et al 11 blended polyimide with doped polyaniline and found considerable improvement of selectivity for water/acetic acid. Recently Chung and coworkers 12 successfully enhanced the hydrophilicity of Matrimid ® by blending Matrimid ® with a highly hydrophilic polymer: polybenzimidazole (PBI). The performance of the blended Matrimid ® /PBI membranes for the dehydration of tert-butanol was improved with the addition of a small amount of PBI.…”

Section: Introductionmentioning

confidence: 99%

Diamine modification of P84 polyimide membranes for pervaporation dehydration of isopropanol

Qiao¹,

Chung²

2006

AIChE Journal

Self Cite

142

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in Wiley InterScience (www.interscience.wiley.com). J, 52: 3462-3472, 2006 Keywords: P84 copolyimide membranes, crosslinking, pervaporation, dehydration, isopropanol The effectiveness of chemical crosslinking modification of P84 copolyimide membranes using diamine compounds for pervaporation dehydration has been investigated and the scheme to enhance separation performance of asymmetric polyimide membranes has been developed. Two diamine crosslinking agents, p-xylenediamine and ethylenediamine (EDA), were used in this study for both dense and asymmetric P84 membranes. Experimental results suggest that the crosslinking reaction induced by EDA is much faster than that by p-xylenediamine because the former has a smaller and linear structure than that of the latter. However, membranes crosslinked by p-xylenediamine are thermally more stable than those by EDA. Membranes modified by p-xylenediamine or EDA have increased hydrophilicity. An increase in the degree of crosslinking reaction initially results in an increase in separation factor with the compensation of lower flux for pervaporation dehydration of isopropanol (IPA). However, a further increase in the degree of crosslinking reaction may swell up the polymeric chains because of the hydrophilic nature of these diamine compounds, thus resulting in low separation performance. It is found that post treatment after crosslinking reaction can significantly enhance as well as tailor membrane performance because of the formation of charge transfer complexes (CTCs) and the enhanced degree of crosslinking reaction. A low-temperature heat treatment may develop pervaporation membranes with high flux and medium separation factor, whereas a high-temperature heat treatment may produce membranes with high separation factor with medium flux. © 2006 American Institute of Chemical Engineers AIChE IntroductionAn azeotrope of isopropanol (IPA) and water mixture can be effectively and economically separated by pervaporation. To develop high-performance pervaporation membranes for the dehydration of IPA, superior selectivity, permeability, and stability of the membrane are the most important criteria. According to the solution-diffusion mechanism in pervaporation, 1,2 high selectivity and permeability can be achieved if one component has more affinity to the membrane and can diffuse faster in the membrane than the others. As for pervaporation dehydration membranes, water is the component that is preferentially absorbed and transported through the membrane. Therefore, in the earlier stage of developing pervaporation dehydration membranes, significant attention has been given to highly hydrophilic materials that have superior water sorption. However, membranes made from highly hydrophilic materials such as polyacrylic acid (PAA), polyvinyl alcohol (PVA), agarose, alginate, and chitosan exhibited excessive swelling in water and showed poor stability. Through modifications such Correspondence concerning this article should be addressed to T.-S. Chung at chencts@nus.edu.sg. © 2006 Ameri...

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“…Polyamide, polyimide, polybenzimidazole, and modified copolyimide P84 have been used for separation water-alcohol mixtures such as water-ethanol, water-isopropanol, and water-buthanol. [14][15][16][17][18][19][20][21][22][23][24][25][26] Precursors of polybenzo[azinoneimides as a thin selective layer of composite membrane on porous polyphenylene oxide support have been studied in separation of aqueous solution of organic liquids (ethanol, isopropanol, acetone, and ethyl acetate) and organicorganic mixture (methanol-cyclohexane). 27 Nevertheless only the detailed investigation of structure peculiarity and individual properties of developed membranes promotes the foundation of materials with an optimal separation factor and flux for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Study on polybenzoxazinone membrane in pervaporation processes

Pulyalina

Polotskaya

Goĭkhman

et al. 2013

J of Applied Polymer Sci

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Poly(benz-3,1-oxazinone-4) was prepared by thermal cyclization of its hydrolytically stable precursor polyamic acid. Both polymer and its precursor were investigated as membrane materials. Thermogravimetric analysis and contact angle measurements were carried out for characterization of peculiarity of membrane compositions and analysis of membrane surface. Pervaporation of water-isopropanol mixture was studied in the wide range of feed composition. To interpret the pervaporation transport properties of the membranes, swelling experiments were performed, kinetic curves of sorption and desorption were plotted, and basic sorption and diffusion parameters were analyzed. It was established that poly(benz-3,1-oxazinone-4) membrane is extremely effective in dehydration of water-isopropanol mixture and shows high separation factor.

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Enhanced Matrimid membranes for pervaporation by homogenous blends with polybenzimidazole (PBI)

Cited by 90 publications

References 30 publications

Water vapor permeation in polyimide membranes

Water vapor permeation in polyimide membranes

Diamine modification of P84 polyimide membranes for pervaporation dehydration of isopropanol

Study on polybenzoxazinone membrane in pervaporation processes

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