Pervaporation separation of aqueous organic mixtures through sulfated zirconia-poly(vinyl alcohol) membrane

Kim, Kwang‐Je; Park, Sanghee; So, Won‐Wook; Moon, Sang‐Jin

doi:10.1002/1097-4628(20010222)79:8<1450::aid-app120>3.0.co;2-x

Cited by 43 publications

(12 citation statements)

References 15 publications

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“…Many crosslinking methods for PVA membrane applications are being used in the literature 15–20. In addition, either chemical or physical incorporation of some of the inorganic species like silica, zirconia, and titania into the polymer matrix enhances the properties such as flexibility and toughness of the resulting membranes 21–23…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of hybrid membranes using poly(vinyl alcohol) and tetraethylorthosilicate for the pervaporation separation of water–isopropanol mixtures

Kulkarni

Kittur

Aralaguppi

et al. 2004

J of Applied Polymer Sci

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Hybrid membranes were prepared using poly(vinyl alcohol) (PVA) and tetraethylorthosilicate (TEOS) via hydrolysis and cocondensation reaction for the pervaporation separation of water-isopropanol mixtures. The resulting membranes were characterized by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, and differential scanning calorimetry. The glass transition temperature of these membranes varied from 100 to 120°C with increasing TEOS content. Effects of crosslinking density and feed compositions on the pervaporation performances of the membranes were studied. The membrane containing 1.5:1 mass ratio of TEOS to PVA gave the highest separation selectivity of 900 at 30°C for 10 mass % of water in the feed mixture. It was found that the separation selectivity and permeation flux data are strongly dependent on the water composition of the feed and operating temperature. However, the membrane with the highest crosslinking density showed unusual pervaporation properties. The overall activation energy values were calculated using the Arrheniustype equation. The activation energy values for the permeation and diffusion varied from 49.18 to 64.96 and 55.13 to 67.31 kJ/mol, respectively. Pervaporation data have also been explained on the basis of thermodynamic quantities.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of hybrid membranes using poly(vinyl alcohol) and tetraethylorthosilicate for the pervaporation separation of water–isopropanol mixtures

Kulkarni

Kittur

Aralaguppi

et al. 2004

J of Applied Polymer Sci

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“…Of these, poly(vinyl alcohol) (PVA) has been commonly used in PV dehydration of alcohols due to its good film forming ability and compatibility , but its excessive swelling in water tend to lower the selectivity to water . In such situations, barrier properties of PVA can be improved by incorporating inorganic fillers such as zeolites, clay, hetropolyacids, mesoporous materials, etc., to develop mixed matrix membranes (MMMs) .…”

Section: Introductionmentioning

confidence: 99%

Mixed matrix membranes of H‐ZSM5‐loaded poly(vinyl alcohol) used in pervaporation dehydration of alcohols: Influence of silica/alumina ratio

Suhas

Aminabhavi

Raghu

2013

Polymer Engineering & Sci

110

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Mixed matrix membranes of poly(vinyl alcohol) loaded with zeolite particles having different silica alumina ratio were prepared and used in the pervaporation dehydration of ethanol and isopropanol (IPA) from their aqueous mixtures. The membranes were characterized by physicochemical techniques that revealed higher interaction between polymer and zeolite particles having higher alumina than those with lower alumina in the zeolite framework. Both, membrane selectivity to water and flux were increased as the alumina content in the zeolite increases. Separation factors of zeolite with lower alumina incorporated membranes were, respectively, 236 and 334 for the feed mixture compositions of 4 wt% water in ethanol and 10 wt% water in IPA at 30 C. On the other hand, membranes containing zeolites with higher alumina content showed slightly higher separation factors of 349 and 568, respectively, for the same feed mixtures at 30 C. Such an incremental improvement in membrane performance with increase in alumina content in the zeolite framework is attributed to favorable interaction between zeolite particles and the polymer matrix.

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“…Zeolites have a high surface area (up to 1000 m 2 /g), a high void volume (30% of the total volume of zeolite), and a uniform pore size distribution, and consequently, they have been used widely in chemical and physical processes such as shape‐selective catalysis and separation media 24. The incorporation of such zeolites into dense membranes can improve the separation performance of PV membranes24–26 by virtue of the combined effects of molecular sieving action, selective adsorption, and differences in diffusion rates. In addition, zeolites have high mechanical strength and good thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation dehydration of isopropyl alcohol with NaY zeolite incorporated hybrid membranes

Kulkarni

Kittur

Davis

2008

J of Applied Polymer Sci

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With a solution technique, NaY zeolite incorporated, tetraethylorthosilicate-crosslinked poly(vinyl alcohol) membranes were prepared. The resulting membranes were tested for their ability to separate isopropyl alcohol/water mixtures by pervaporation in the temperature range of 30-508C. The effects of the zeolite content and feed composition on the pervaporation performance of the membranes were investigated. The experimental results demonstrated that both flux and selectivity increased simultaneously with increasing zeolite content in the membranes. This was explained on the basis of the enhancement of hydrophilicity, selective adsorption, and establishment of a molecular sieving action attributed to the creation of pores in the membrane matrix. The membrane containing 15 mass % zeolite exhibited the highest separation selectivity of 3991 with a flux of 5.39 3 10 22 kg/m 2 h with 10 mass % water in the feed at 308C. The total flux and flux of water were close to each other for almost all the studied membranes, and this suggested that the membranes could be used effectively to break the azeotropic point of water/isopropyl alcohol mixtures to remove a small amount of water from isopropyl alcohol. From the temperature-dependent diffusion and permeation values, the Arrhenius activation parameters were estimated. The activation energy values obtained for water were significantly lower than those for isopropyl alcohol, and this suggested that the developed membranes had a higher separation efficiency for water/isopropyl alcohol systems. The activation energy values for total permeation and water permeation were found to be almost the same for all the membranes, and this signified that coupled transport was minimal because of the highly selective nature of the membranes. Positive heat of sorption values were observed in all the membranes, and this suggested that Henry's mode of sorption was predominant.

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Pervaporation separation of aqueous organic mixtures through sulfated zirconia-poly(vinyl alcohol) membrane

Cited by 43 publications

References 15 publications

Synthesis and characterization of hybrid membranes using poly(vinyl alcohol) and tetraethylorthosilicate for the pervaporation separation of water–isopropanol mixtures

Synthesis and characterization of hybrid membranes using poly(vinyl alcohol) and tetraethylorthosilicate for the pervaporation separation of water–isopropanol mixtures

Mixed matrix membranes of H‐ZSM5‐loaded poly(vinyl alcohol) used in pervaporation dehydration of alcohols: Influence of silica/alumina ratio

Pervaporation dehydration of isopropyl alcohol with NaY zeolite incorporated hybrid membranes

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