Separation of IPA/water mixtures by pervaporation: sorption and pervaporation results

Hilmioğlu, Nilüfer Durmaz; Tulbentci, Sema

doi:10.1016/s0042-207x(03)00096-4

Cited by 23 publications

(8 citation statements)

References 10 publications

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“…Since the dewatering of organic solvents, and more specifically of low molecular weight alcohols, is the most common application, there are many publications on the separation of ethanol-water mixtures (Kim et al, 2000;Ni et al, 2001;Nomura et al, 1998;Wesslein et al, 1990) and the separation of IPA-water mixtures (Gallego-Lizon et al, 2002;Hilmioglu and Tulbentci, 2003;Wesslein et al, 1990). However, these mixtures are mostly used as a "standard test" to evaluate a newly developed or synthesized membrane.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation of water–alcohol mixtures and acetic acid–water mixtures

Baelen

Bruggen

Dungen

et al. 2005

Chemical Engineering Science

135

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Section: Introductionmentioning

confidence: 99%

Pervaporation of water–alcohol mixtures and acetic acid–water mixtures

Baelen

Bruggen

Dungen

et al. 2005

Chemical Engineering Science

135

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“…However, to achieve adequate chemical stability, a blend of PVA and PAA needs to be crosslinked before being used in pervaporation. As previously reported, a thermal process was found useful for this purpose [5,6].…”

Section: Introductionmentioning

confidence: 68%

Pervaporation through composite membranes with plasma treatment of porous support

Carlo

Gottifredi

Habert

2011

Desalination and Water Treatment

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2011)Pervaporation through composite membranes with plasma treatment of porous support, Desalination and Water Treatment,[135][136][137][138][139][140] To link to this article: http://dx. A B S T R AC TComposite membranes were prepared in independent stages. First, a polyethersulfone (PES) support porous membrane was synthesized by the phase inversion technique; a plasma pretreatment of the substrate surface using argon was followed by activated support coating with a layer of hydrophilic polymeric mixture of poly(vinyl alcohol) (PVA, 75 wt.%) and poly(acrylic acid) (PAA, 25 wt.%). Finally, thermal treatment of the composite membranes to promote crosslinking of the coated polymer was undertaken. Morphology was examined by electronic microscopy (SEM) for both, support membranes and the polymeric blend layer. Contact angles (θ) were measured and surface free energy (γ S ) and adhesion work (W a ) estimated, to evaluate the effect of plasma and hydrophilic polymer coatings. From infrared spectra with horizontal attenuated total refl ectance (FT-IR/HATR), surface chemical composition of support membrane and incorporated hydrophilic groups, were analyzed. Composite membranes were investigated with water-ethanol (20/80 wt.%) mixtures performing pervaporation (PV) experiments at several temperatures (30, 40, 50 and 60°C). The membrane showed good performance for separation of water from ethanol. Fluxes, selectivity (α water/Ethanol ) and permeation activation energy (E Ji ) are reported showing that the composite membranes were selective to water. Pervaporation separation index (PSI) (g m −2 h −1 ) increased continuously with temperature.

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“…5,6 Over the past decades, several researches have been conducted using different kinds of hydrophilic polymers, particularly poly(vinyl alcohol) (PVA), poly(acrylic acid) (PAA) and some polysaccharides including cellulose, hydroxyl ethyl cellulose (HEC), chitosan (CS), and sodium alginate as membranes for PV dehydration of IPA/water mixtures. 1,2,[7][8][9][10][11][12] Within them, PVA is considered as the most important material applied in PV separation of organic-water compounds due to its high hydrophilicity, excellent film-forming ability along with high thermal, chemical, and mechanical stability. 13,14 However, flux of PVA membranes in PV dehydration of organics is not satisfactory owing to the glassy and semi-crystalline character of PVA.…”

Section: Introductionmentioning

confidence: 99%

Modified poly(vinyl alcohol)/chitosan blended membranes for isopropanol dehydration via pervaporation: Synthesis optimization and modeling by response surface methodology

Ghobadi

Mohammadi

Kasiri

et al. 2016

J of Applied Polymer Sci

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Box–Behnken (BB) design of response surface methodology (RSM) was effectively applied to optimize fabrication conditions of modified poly(vinyl alcohol) (PVA) and chitosan (CS) blended pervaporation (PV) membranes. The PVA/CS membranes were crosslinked either by chemical reaction with glutaraldehyde (GA) or by heat‐treating at different temperatures. The main objectives were to determine the optimal levels of fabricating parameters and also to investigate interactions among the variables. CS content in the blended membranes, concentration of crosslinking agent and heat‐treating temperature were the fabrication parameters, the main effects and interaction effects of which on membrane structure and PV performance toward isopropanol (IPA)/water dehydration were investigated, and for which regression models were established. The modified PVA/CS blended membranes were characterized by means of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) as well as X‐ray diffraction (XRD). It was found that the CS content is the most significant factor influencing flux and separation factor among the three studied variables and the experimental results are in excellent accordance with predicted values from the developed RSM regression models. The RSM results indicated that under preparation conditions of 80 wt % CS in the blended membrane, 0.58 wt % GA concentration, and 77 °C heat‐treating temperature, the maximum separation factor of 5222.8 and the normalized flux of 9.407 kg µm/m2h can be acquired with feed content of 85 wt % IPA at 25 °C, showing that the prepared membrane is highly efficient for PV dehydration of IPA. The models were satisfactorily validated against experimental data. Furthermore, the optimum membrane presents excellent separation performance at different feed compositions and temperatures. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44587.

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Separation of IPA/water mixtures by pervaporation: sorption and pervaporation results

Cited by 23 publications

References 10 publications

Pervaporation of water–alcohol mixtures and acetic acid–water mixtures

Pervaporation of water–alcohol mixtures and acetic acid–water mixtures

Pervaporation through composite membranes with plasma treatment of porous support

Modified poly(vinyl alcohol)/chitosan blended membranes for isopropanol dehydration via pervaporation: Synthesis optimization and modeling by response surface methodology

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