An investigation of the long-term sorption kinetics and diffusion anomalies of chloroalkanes into tetrafluoroethylene/propylene copolymer membranes at 30, 45 and 60°C

Aminabhavi, Tejraj M.; Harlapur, Sujata F.; Balundgi, R. H.; Ortego, J. Dale

doi:10.1016/s0032-3861(97)00373-x

Cited by 12 publications

(12 citation statements)

References 24 publications

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“…For all the membranes, sigmoidal shapes are observed for the sorption curves, suggesting that the molecular transport in these systems deviates from Fickian trend. 28,29 Also, the equilibrium sorption curves for all the membranes at a longer time merge together into a single curve for the 20 and 30 mass % water-containing feed mixtures.…”

Section: Resultsmentioning

confidence: 99%

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Syntheses and characterization of blend membranes of sodium alginate and poly(vinyl alcohol) for the pervaporation separation of water + isopropanol mixtures

Kurkuri

Toti

Aminabhavi

2002

J of Applied Polymer Sci

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137

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ABSTRACT:The blend membranes of sodium alginate and poly(vinyl alcohol) have been prepared by physical mixing in different ratios (75, 50, and 25%) of sodium alginate with poly(vinyl alcohol). The membranes were crosslinked with glutaraldehyde and used in the pervaporation separation of water ϩ isopropanol mixtures at 30°C. The crosslinking reaction was confirmed by Fourier transform infrared spectra. Permeation flux increased with an increase in mass % of water in the feed mixture as well as with an increase in the amount of poly(vinyl alcohol) in the blend, but separation selectivity decreased. Diffusion coefficients of water ϩ isopropanol mixtures have been calculated using the Fick's equation from the sorption data. Arrhenius activation parameters were calculated for 10 mass % of water in the feed mixture using the values of flux and diffusion coefficients obtained at 30, 40, and 50°C. The diffusion and pervaporation results have been explained on the basis of solution-diffusion principles.

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Section: Resultsmentioning

confidence: 99%

“…The values of n between 0.5 and 1.0 represent the anomalous transport. 28,29 The values of n and k have been calculated from the least squares method by fitting the sorption results to eq. (8) at 95% confidence limit and these are presented in Table IV.…”

Section: Resultsmentioning

confidence: 99%

Syntheses and characterization of blend membranes of sodium alginate and poly(vinyl alcohol) for the pervaporation separation of water + isopropanol mixtures

Kurkuri

Toti

Aminabhavi

2002

J of Applied Polymer Sci

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137

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“…measured and found to be in between 3 and 20 kJ mol 21 depending on the penetrant size. An investigation of sorption kinetics and diffusion of chloroalkanes into tetrafluoro ethylene/propylene copolymer membranes was reported [28], where activation energy of diffusion for chloroform was found to be around 15 kJ mol 21 . Diffusion and permeation properties of substituted benzenes through variety of membranes formed from blends of nitrile rubber and natural rubber have been studied in the temperature interval of 28 -70 8C and the values of activation energies were measured to be around 10 kJ mol 21 [29].…”

Section: Dryingmentioning

confidence: 99%

Fast transient fluorescence method for measuring swelling and drying activation energies of a polystyrene gel

Erdoğan

Pekcan

2004

Polymer

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“…In previous studies from this laboratory,4–15 we reported different aspects of diffusion anomalies for several polymer/solvent systems. In continuation of these studies, we present here sorption ( S ), diffusion ( D ), and permeation ( P ) characteristics of these liquids at 40 and 50°C to understand the structure–diffusion, –sorption, and –permeation relationships through the Fluorel™ FLS‐2650 membrane, which is a terpolymer derived from tetrafluoroethylene, propylene, and difluoromethylene (developed by the 3M Company).…”

Section: Introductionmentioning

confidence: 90%

Experimental and simulation studies on molecular transport of substituted monocyclic aromatic liquids into fluoropolymer sheet membranes: Liquid structure–diffusion, –sorption, and –permeation relationships

Aminabhavi

Naidu

2004

J of Applied Polymer Sci

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ABSTRACT:The present study reports an investigation on the molecular transport of 10 monocyclic aromatic liquids (benzene, chlorobenzene, 1,2-dichlorobenzene, bromobenzene, toluene, p-xylene, trimethylbenzene, ethylbenzene, methoxybenzene, and ethoxybenzene) at 40 and 50°C through sheet polymeric membranes (FLS-2650) using a sorption gravimetric technique. Diffusion and permeation coefficients of these liquids were calculated from the sorption data using Fick's diffusion equation. Sorption results were analyzed typically in the case of benzene and chlorobenzene to compute the concentration profiles at different depths along the thickness direction of the sheet membranes and at different time intervals by solving the Fick's equation under appropriate boundary conditions, based on the numerical simulation method developed in "C" language using a finite-difference method. Transport results were analyzed to establish the relationships between the penetrating liquid structures with diffusion, permeation, and sorption data.

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An investigation of the long-term sorption kinetics and diffusion anomalies of chloroalkanes into tetrafluoroethylene/propylene copolymer membranes at 30, 45 and 60°C

Cited by 12 publications

References 24 publications

Syntheses and characterization of blend membranes of sodium alginate and poly(vinyl alcohol) for the pervaporation separation of water + isopropanol mixtures

Syntheses and characterization of blend membranes of sodium alginate and poly(vinyl alcohol) for the pervaporation separation of water + isopropanol mixtures

Fast transient fluorescence method for measuring swelling and drying activation energies of a polystyrene gel

Experimental and simulation studies on molecular transport of substituted monocyclic aromatic liquids into fluoropolymer sheet membranes: Liquid structure–diffusion, –sorption, and –permeation relationships

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