Poly(vinyl alcohol) and poly(vinyl amine) blend membranes for isopropanol dehydration

Abstract

Blended membranes of hydrophilic polymers poly(vinyl alcohol) (PVA) and poly(vinyl amine) (PVAm) were prepared and crosslinked with glutaraldehyde. The prepared membranes were characterized using infrared (attenuated total reflection mode) spectroscopy, differential scanning calorimetry, X-ray diffractometry, and scanning electron microscopy measurements. Pervaporation performances of the membranes were evaluated for the separation of water-isopropanol (IPA) mixtures. As the PVAm content increased from PVAm0 to PVAm1.5, the flux through a 70 lm film increased from 0.023 to 0.10 kg/m 2 h at an IPA/water feed ratio of 85/15 at 30 8C. The driving force for permeation of water increased due to the temperature but it has no effect on IPA permeation. Activation energies for the permeation of IPA and water were calculated to be 17.11 and 12.46 kJ/mol, respectively. Controlling the thickness of the blend membrane could improve the permeation flux with only a marginal reduction in the separation factor. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45572.

Ag-exchanged NaY zeolite introduced polyvinyl alcohol/polyacrylic acid mixed matrix membrane for pervaporation separation of water/isopropanol mixture

“…7,18,33,37 Membrane thickness of present study is 50 mm and higher ux with marginally decreased in the separation factor can be obtained by decreasing the membrane thickness according to the solution diffusion model 5 and Fick's law of diffusion. Fabrication of composite membrane by applying thin layer of AgNaZ-M5 membrane on porous support is feasible.…”

“…In recent years, numerous polymeric membranes have been developed 6 and employed in IPA dehydration [7][8][9] because of advantages such as lower costs, easier fabrication processes, and superior scalability. Polyvinyl alcohol is a hydrophilic polymer used in such membranes; because of its good chemical, thermal resistance, and lm-forming properties, [7][8][9][10][11] it has proven to be the most promising and consistent candidate in PV dehydration applications.…”

“…Polyvinyl alcohol is a hydrophilic polymer used in such membranes; because of its good chemical, thermal resistance, and lm-forming properties, [7][8][9][10][11] it has proven to be the most promising and consistent candidate in PV dehydration applications.…”

Stability and pervaporation characteristics of PVA and its blend with PVAm membranes in a ternary feed mixture containing highly reactive epichlorohydrin

“…Preparation of crosslinked PVA and PVA/PVAm blend membrane samples PVA and PVA/PVAm blend membranes were prepared according to the procedure described in our previous paper. 33 One PVA membrane and three glutaraldehyde-crosslinked PVA/PVAm blended membranes were prepared. The designation and details of the PVA and PVAm contents for the blended membranes are shown in Table 1.…”

“…Therefore, in our recent reports we have studied membranes prepared from blends of PVA and poly(vinyl amine) (PVAm) for pervaporation dehydration of water/isopropanol feed mixtures. 14,33 Additionally, Deng and Hagg et al have explored a similar type of membrane composition in the application of a xed carrier transport (FSC) membrane for CO 2 separation. 34,35 PVA/PVAm blends provide good membrane stability and mechanical strength because PVAm has a high density of primary amine moieties that exhibit a stable polymer network with PVA during blending by entanglement of the PVA chains with the PVAm chains.…”