Pervaporative separation of isopropyl alcohol/water mixtures: effects of the operation conditions

Hilmioğlu, Nilüfer Durmaz; Tulbentci, Sema

doi:10.1080/19443994.2012.698812

Cited by 7 publications

(5 citation statements)

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“…However, the use of membranes based on these polymer materials requires additional cross-linking that, as a rule, leads to the decrease of permeation flux [12]. To improve the transport characteristics, additional bulk and surface modification methods can to be successfully applied, as previously shown [15][16][17][18][19][20].In this study, the selected material is polyvinyl alcohol, which is widely used for dehydration purposes due to its high water selectivity, good film-forming properties, and economic accessibility [1,4,21,22]. However, pristine PVA membranes without additional modification and cross-linking exhibit poor stability in aqueous solutions where large swelling is observed.…”

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confidence: 99%

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Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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In this work, dense and supported pervaporation polyvinyl alcohol (PVA)-based membranes modified with poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate)(PSS)/PAH top nanolayers were synthesized. Two main points were investigated: the role of the polyelectrolyte PAH on water selectivity of the selective polymer matrix and the impact of the porous substrate based on polyacrylonitrile (PAN) and aromatic polysulfone amide (UPM-20 ® ), used to get supported high-performance membranes. Various methods of analysis (fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), porosity, contact angles, ultrafiltration) were applied to study the developed membranes. Transport characteristics of the developed membranes were studied in isopropanol dehydration by pervaporation. Obtained results are discussed in the light of the structure and physicochemical characteristics of these PVA/PAH membranes and the types of porous substrate. It was shown that the PAN-supported membrane with the selective layer based on PVA/PAH modified by 10 polyelectrolyte PSS/PAH bilayers possessed~4.5 times higher permeation flux with the same high selectivity level (99.9 wt % water in the permeate) for the dehydration of the isopropanol (20 wt % water) at 60 • C compared to the commercial analog PERVAP TM 1201.Polymers 2020, 12, 14 2 of 22 repellents, etc. Yet, for industrial application, the solvent must usually be anhydrous. In addition, this alcohol forms an azeotropic mixture with water (12 wt % water-88 wt % isopropanol) [8], which considerably hinders its dehydration via simple traditional methods of separation that entail a non-environmentally friendly process (addition of a third harmful organic reagent) and a high energy consumption (high temperature or low pressure, expensive equipment). Pervaporation is a promising and perspective technology for this task. Different types of pervaporation membranes (polymeric, inorganic, and composite) were developed for the dehydration of isopropanol [9][10][11][12]. Polymeric membranes find wider applications and are attractive because of the simplicity of their fabrication and lower price compared to inorganic membranes. The most popular polymer materials for dehydration are green water-soluble polymers, such as polyvinyl alcohol (PVA), chitosan (CS), cellulose, and sodium alginate [1,13,14], because these polymers possess high selectivity to water. However, the use of membranes based on these polymer materials requires additional cross-linking that, as a rule, leads to the decrease of permeation flux [12]. To improve the transport characteristics, additional bulk and surface modification methods can to be successfully applied, as previously shown [15][16][17][18][19][20].In this study, the selected material is polyvinyl alcohol, which is widely used for dehydration purposes due to its high water selectivity, good film-forming properties, and economic accessibility [1,4,21,22]. However, p...

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Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

et al. 2019

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“…Research on PVA-PAA composites began many years ago, when interest was first aroused in the development of pervaporation membranes for various purposes [35][36][37]. These studies have been continued to the present day [38,39]. There are several significant reasons for the ongoing interest in this polymer pair.…”

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confidence: 99%

Effect of Phase Heterogeneity on the Properties of Poly(vinyl alcohol)-Based Composite Pervaporation Membranes

et al. 2022

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The structure, thermophysical characteristics, and pervaporation properties of composite membranes based on poly(vinyl alcohol) (PVA) are studied in dependence of the film preparation conditions. It is shown that the nature of the supramolecular organization of the composite polymer film determines which of the components of the separated mixtures of toluene and heptane predominantly penetrate through the corresponding pervaporation membrane. The observed structural effects can become more pronounced if the second component of a polymer mixture is purposefully selected (in this case, poly(N,N-dimethylaminoethyl methacrylate) instead of poly(acrylic acid)) or a nano-sized filler that can be well dispersed in the polymer matrix is introduced. Multi-wall carbon nanotubes are introduced into binary PVA-containing polymer blends. The influence of these fillers on the structure and transport properties of the obtained membranes is studied.

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“…Various PVA membranes have already been widely used for the dehydration of isopropanol by pervaporation. However, to prevent strong swelling of the PVA in the aqueous solution and improve its stability, various methods for the modification or cross-linking of PVA have been attempted, for example, the creation of mixed-matrix blend membranes based on copolymers PVA/poly(N-isopropylacrylamide) (PNIPAAm) [18], PVA/sodium carboxymethylcellulose (NaCMC)/ poly [19,20], and PVA/chitosan [21]; cross-linking with polyacrylic acid (PAA) [22], glutaraldehyde (GA) with concentrated HCl [19,20], oxalic acid (OA), dimethylol urea (DMU) and tetraethyl orthosilicate (TEOS) [23]; and the introduction of a zeolite or hydrophilic aluminosilicate filler into the PVA matrix [19,23]. However, PVA membrane performance still needs improvement for industrial separation processes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of new modification strategies for PVA membranes to improve their dehydration properties by pervaporation

Dmitrenko

Penkova

Kuzminova

et al. 2018

Applied Surface Science

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Novel supported membranes based on polyvinyl alcohol (PVA) were developed using two strategies: first, by the modification of the PVA network, via so-called bulk modification, with the formation of the selective layer accomplished through the introduction of fullerenol and/or poly(allylamine hydrochloride), and second, by the functionalization of the surface with successive depositions of multilayered films of polyelectrolytes, such as poly(allylamine hydrochloride) and poly(sodium 4-styrenesulfonate) on the PVA surface. The membrane surface modifications were characterized by scanning electron microscopy and contact angle measurements. The modified PVA membranes were examined for their dehydration transport properties by the pervaporation of isopropyl alcohol-water (80/20% w/w), which was chosen as a model mixture. Compared with the pristine PVA membrane, the main improvement was a marked increase in permeance. It was found that the surface modifications mainly gave rise to a higher global flux but with a strong reduction in selectivity. Only the combination of both bulk and surface modifications with PEL could significantly increase the flux with a high water content in the permeate (over 98%). Lastly, it should be noted that this study developed a green procedure to prepare innovative membrane layers for dehydration, making use of only water as a working medium.

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Pervaporative separation of isopropyl alcohol/water mixtures: effects of the operation conditions

Cited by 7 publications

References 0 publications

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Enhanced Pervaporation Properties of PVA-Based Membranes Modified with Polyelectrolytes. Application to IPA Dehydration

Effect of Phase Heterogeneity on the Properties of Poly(vinyl alcohol)-Based Composite Pervaporation Membranes

Investigation of new modification strategies for PVA membranes to improve their dehydration properties by pervaporation

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