Pervaporation separation of acetic acid-water mixtures using modified membranes. Part II. Gammaray-induced grafted polyacrylic acid (PAA)-nylon 6 membranes

Huang, Robert Y. M.; Xu, Yunfei

doi:10.1016/s0376-7388(00)85093-0

Cited by 48 publications

(8 citation statements)

References 4 publications

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“…However this process loses the hydrophilic character of PVA. To increase the hydrophilicity of PVA, the processes such as blending (19 -24), cross-linking (25,26), grafting (18,24,(27)(28)(29)(30)(31)(32), etc., are usually carried on in the presence of hydrophilic polymers.…”

Section: G Asman and O ş Anlı 1194mentioning

confidence: 99%

Separation of Acetic Acid‐Water Mixtures through Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Alloy Membranes by Using Evapomeation and Temperature Difference Evapomeation Methods

Asman

Şanlı

2006

Separation Science and Technology

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Separation of acetic acid-water mixtures by using evapomeation (EV) method were carried out over the full range of compositions at temperatures varying from 30 to 558C using poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) (75/25) (v/v) alloy membranes. PVA/PAA membranes gave separation factors of 110-5711 and permeation rates of 2.3 Â 10 24 -1.53 Â 10 21 kg/m 2 h, depending on the operation temperature and feed mixture composition. The temperature dependence of the permeation in EV was expressed by the Arrhenius type expression and the activation energy was calculated as 9.15 kcal/mol. More efficient EV technique, which is called temperature difference evapomeation method (TDEV) was also applied to PVA/PAA membranes to separate acetic acid-water mixtures; high permeation rates (1.7 Â 10 23 -3.0 Â 10 21 kg/m 2 h) and separation factors (1335-8924) were obtained for each of the studied feed compositions. Azeotropic mixture of acetic acid and water was also separated by TDEV method with a separation factor of 297 and permeation rate of 1.50 Â 10 21 kg/m 2 h.

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Section: G Asman and O ş Anlı 1194mentioning

confidence: 99%

Separation of Acetic Acid‐Water Mixtures through Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Alloy Membranes by Using Evapomeation and Temperature Difference Evapomeation Methods

Asman

Şanlı

2006

Separation Science and Technology

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“…At both extreme concentration ranges, the separation factors are also much higher. This phenomena was also observed in the separation of acetic acid mixture using blended PAA-Nylon 6 membranes a t 25"C. 14 The McCabe-Thiel diagram of Figure 4 shows how the concentration of permeate changes with feed concentration. The liquid-vapor equilibrium curve of ethanol-water is also given for comparison of pervaporation performance.…”

Section: Selectivity Of Blended Membrane For Ethanol-water Mixturesmentioning

confidence: 57%

Pervaporation separation of ethanol–water mixtures using ionically crosslinked blended polyacrylic acid (PAA)–nylon 6 membranes

Huang

1988

J of Applied Polymer Sci

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SynopsisThe pervaporation separation of ethanol-water mixtures was carried out through a series of ionically crosslinked polyacrylic acid (PAA)-Nylon 6-blended membranes crosslinked to varying degrees in aluminum nitrate solution. The polyacrylic acid (PAA)-Nylon 6 membranes were cast from homogeneous PAA-Nylon 6 mixtures to various thicknesses and then crosslinked. Optimum pervaporation results were obtained from crosslinked blends containing 75 wt% Nylon 6 and 25 wt% PAA. These membranes have separation factors (water/ethanol) of 35-40 a t flux rates of 120-160 g/m2 h. The optimum crosslinking time was found to be approximately 35 h t o yield membranes with the best separation and flux rates a t 25 wt% PAA content.

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“…Thompson et a1.l' recently reported experimental results on the hexaneheptane and toluene-ethanol systems. The specific goals of this research are the synthesis and preparation of nylon 6-PAA ionically cross-linked membranes prepared according to the methods described earlier, [1][2][3][4][5][6] and the subsequent pervaporation separation of the pentane-methanol mixtures in terms of permeabilities and separation factors. The pervaporation results were then compared with the calculated values using the modified Fels-Huang model that recently has been r e p~r t e d .…”

Section: Ntro Duct1 Onmentioning

confidence: 99%

Pervaporation separation of pentane–alcohol mixtures using nylon 6–polyacrylic acid (PAA) ionically crosslinked membranes. II. Experimental data and theoretical interpretation

Huang

Balakrishnan

Rhim

1992

J of Applied Polymer Sci

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SYNOPSISNovel ionically cross-linked blended membranes of nylon 6 and poly (acrylic acid) (PAA) were studied for the pervaporation separation of the binary organic mixture of pentane and methanol. Membranes of composition 25 wt % PAA were used after cross-linking. The experimental data obtained from the pervaporation runs were compared with the theoretical values of the individual permeabilities for binary mixtures predicted by the modified Fels and Huang model. This new model is based on a n extension of the free volume theory and the introduction of Flory-Huggins thermodynamics for the calculations of the binary interaction parameters and the diffusion coefficients. The calculated values of permeabilities obtained from this modified model were reasonably close to the experimental values. I NTRO DUCT1 ONThe present paper is concerned with the use of blending and cross-linking techniques to develop highly permselective membranes for the pervaporation separation of pentane-methanol mixtures over the entire range of compositions. It is a continuation of our investigation on the synthesis and preparation of ionically cross-linked nylon 6-poly ( acrylic acid) (PAA) -blended membranes that have been successfully used for the separation of acetic acid-water and ethanol-water mixture systems and have beenThe present study deals with the separation of pentane-methanol mixtures that forms an azeotrope at 93% wt % pentane. Part I of this investigation dealt with the preparation of the membrane and its characterization in terms of glass transition temperature, morphology, mechanical properties, and water absorption.' Currently, little data are available for such alkane-alcohol mixtures. Aptel et al.' reported a detailed investigation of several constant boiling liquid systems comprising water aphotic solvents, water alcohol, and water alkane mixtures. They have reported data for ethanol-hexane mixtures that are close to the system presently being reported. Another similar system is that of methanol and hexane which has been reported by Cabasso." They used different membranes including ion-exchange membranes ( Nafion ) and highly crosslinked quaternary poly ( phenylene oxide ) ( PPO ) membranes for this purpose. Thompson et a1.l' recently reported experimental results on the hexaneheptane and toluene-ethanol systems. The specific goals of this research are the synthesis and preparation of nylon 6-PAA ionically cross-linked membranes prepared according to the methods described earlier, 1-6 and the subsequent pervaporation separation of the pentane-methanol mixtures in terms of permeabilities and separation factors. The pervaporation results were then compared with the calculated values using the modified Fels-Huang model that recently has been r e p~r t e d . '~.~~ This new model is based on an extension of the free-volume theory and the introduction of the Flory-Huggins thermodynamics for the calculation of the binary inter- 109

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Pervaporation separation of acetic acid-water mixtures using modified membranes. Part II. Gammaray-induced grafted polyacrylic acid (PAA)-nylon 6 membranes

Cited by 48 publications

References 4 publications

Separation of Acetic Acid‐Water Mixtures through Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Alloy Membranes by Using Evapomeation and Temperature Difference Evapomeation Methods

Separation of Acetic Acid‐Water Mixtures through Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Alloy Membranes by Using Evapomeation and Temperature Difference Evapomeation Methods

Pervaporation separation of ethanol–water mixtures using ionically crosslinked blended polyacrylic acid (PAA)–nylon 6 membranes

Pervaporation separation of pentane–alcohol mixtures using nylon 6–polyacrylic acid (PAA) ionically crosslinked membranes. II. Experimental data and theoretical interpretation

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