Generalized dual-mode modelling of xylene isomer sorption in polyvinylalcohol membranes containing α-cyclodextrin

Touil, S.; Palmeri, John; Tingry, Sophie; Bouchtalla, S.; Deratani, A.

doi:10.1016/j.memsci.2007.07.033

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…As a result, the former can preferentially transport through the hydrophobic CD cavity compared to the latter because of higher diffusion selectivity in the CD‐grafted PAI membrane. Similar results have been reported previously 5, 7, 10–13, 18. The simulation result also indicates that m‐XDA‐β‐CD has a higher butanol selectivity than the original β‐CD.…”

Section: Resultssupporting

confidence: 90%

“…To enhance the separation performance, mixed matrix membranes (MMM) containing cyclodextrin (CD) units such as poly(acrylic acid) (PAA)/CD or poly(vinyl alcohol) (PVA)/CD membranes have been investigated extensively by pervaporation separation for organic dehydration,8, 9 isomer separations,5, 7, 10–13 and other organic–organic separations 14, 15. Experimental results showed that the CD addition increased the membrane separation performance in both permeation flux and selectivity due to the unique molecular recognition property of CD.…”

Section: Introductionmentioning

confidence: 99%

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Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Wang¹,

Chung²,

Wang³

2011

AIChE Journal

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A novel cyclodextrin (CD) derivative, m-xylenediamine-b-cyclodextrin (m-XDA-b-CD), has been synthesized and used to graft b-CD on membrane surface for the pervaporation separation of butanol isomers. The reaction mechanisms for the m-XDA-b-CD synthesis and the membrane surface grafting are confirmed by FTIR and TGA. The asfabricated novel CD-grafted polyamide-imide (PAI) membranes show homogeneous morphology and significant improved separation performance as compared to the unmodified PAI membranes and PAI/CD mixed matrix membranes made of physical blends. The effects of chemical modification time and dope concentration on the asymmetric membrane have been studied. The optimal separation performance can be found with the CD-grafted PAI membrane cast from a 22 wt % dope concentration, which exhibits a total butanol flux of 15 g/m 2 /h and a separation factor of 2.03. This newly developed membrane with surface-immobilized CD may open new perspective for the development of next-generation high-performance pervaporation membranes for liquid separations.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Wang¹,

Chung²,

Wang³

2011

AIChE Journal

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“…1,2 Single and mixed xylene isomers are typical products of petrochemical production processes such as catalytic reforming and gasoline cracking. [3][4][5][6] Xylenes are normally a mixture of three regioisomers of o-xylene (oX), m-xylene (mX), and p-xylene (pX), all of them possessing similar physicochemical properties. The isomer pX is widely used as the key raw material in the production of terephthalic acid.…”

Section: Introductionmentioning

confidence: 99%

Efficient adsorption separation of xylene isomers using a facilely fabricated cyclodextrin‐based metal–organic framework

Chen

Zhu

et al. 2018

J of Chemical Tech & Biotech

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Background Metal−organic frameworks (MOFs) are energy‐efficient adsorbents for separating industrial chemical feedstocks. A type of MOF containing an extended porous network of γ‐cyclodextrin (γ‐CD) and alkali metal salts, CD‐MOF, has potential applications in adsorption separation processes in the petrochemical industry. This study aims to present the adsorption efficiency of CD‐MOF‐1 in separating xylene regioisomers. Results The adsorption separation of xylene regioisomers on layered CD‐MOF‐1 microcrystals was studied using batch vapor‐phase adsorption and liquid‐phase breakthrough adsorption. CD‐MOF‐1 showed preferable adsorption of o‐xylene over the other two isomers, with adsorption strength in the order o‐xylene (oX) > m‐xylene (mX) > p‐xylene (pX). With increased temperature, high adsorption capacities of oX and mX over pX were detected. However, this also resulted in a decrease of the separation factors of oX/pX and mX/pX. Conclusion The high resolution and large separation factors for oX/pX and mX/pX make CD‐MOF‐1 an efficient and reliable alternative adsorbent to the isolation protocols for xylene isomers currently used in the petrochemical industry. © 2018 Society of Chemical Industry

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“…Several applications have been described in which cyclodextrins or cyclodextrin derivatives have been immobilized in different polymeric supports. Cyclodextrins have been immobilized in polyvinyl alcohol based membranes for pervaporation of alcohol/water mixtures [10], and enantiomer separation and sorption of xylene [11]. The same objective was pursued in the preparation of polyacrylic acid membranes containing diverse cyclodextrines [12].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of β-cyclodextrin in ethylene-vinyl alcohol copolymer for active food packaging applications

López-de-Dicastillo

Gallur

Catalá

et al. 2010

Journal of Membrane Science

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a b s t r a c tCurrent developments in active food packaging are focusing on incorporating agents into the polymeric package walls that will release or retain substances to improve the quality, safety and shelf-life of the food. Because cyclodextrins are able to form inclusion complexes with various compounds, they are of potential interest as agents to retain or scavenge substances in active packaging applications. In this study, ␤-cyclodextrin (␤CD) was successfully immobilized in an ethylene-vinyl alcohol copolymer with a 44% molar percentage of ethylene (EVOH44) by using regular extrusion with glycerol as an adjuvant. Films with 10%, 20% and 30% of ␤CD were flexible and transparent. The presence of the agent slightly increased the glass-transition temperature and the crystallinity percentage of the polymer, that is to say, it induced some fragility and a nucleating effect. The water vapor, oxygen and carbon dioxide barrier properties of the materials containing ␤CD were determined and compared with those of the pure polymeric material. Permeability to these three permeants increased with the addition of ␤CD due to the presence of discontinuities in the matrix and to the internal cavity of the oligosaccharide. Also the CO 2 /O 2 permselectivity increased with the addition of ␤CD. Finally, the potential effect of the composites in the food aroma was analyzed. The materials with ␤CD preferentially sorbed apolar compounds such as terpenes. This characteristic could be useful in active packaging applications for preferentially retaining undesired apolar food components like hexanal or cholesterol.

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Generalized dual-mode modelling of xylene isomer sorption in polyvinylalcohol membranes containing α-cyclodextrin

Cited by 9 publications

References 26 publications

Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Polyamide–imide membranes with surface immobilized cyclodextrin for butanol isomer separation via pervaporation

Efficient adsorption separation of xylene isomers using a facilely fabricated cyclodextrin‐based metal–organic framework

Immobilization of β-cyclodextrin in ethylene-vinyl alcohol copolymer for active food packaging applications

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