Pervaporation of Water-Alcohol Mixture by Cellulose Nitrate-Poly (Methyl Acrylate) Blended Membranes

Suzuki, Fumio; Onozato, Kenji; Narita, Motoki; Takahashi, Naomichi

doi:10.2115/fiber.38.7_t296

Cited by 9 publications

(1 citation statement)

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“…For this situation, the permeability P may be expressed by eq 3. 3 • 21 • 22 (3) where vPDMs is the volume fraction of PDMS, PPoMs the permeability in the homopolymer of PDMS, and <I> the impedance factor. The <I> values were estimated from eq 3 using the values of P/ PPDMs which were obtained from the ratios of QI to that of the corresponding PDMS (H-1 or H-2).…”

Section: Pervaporation and Sorption Through And Inmentioning

confidence: 99%

Pervaporation of Water-Ethanol Mixtures through Poly-dimethylsiloxane Block-Copolymer Membranes

Okamoto

Butsuen

Tsuru

et al. 1987

Polym J

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ABSTRACT:Pervaporation and sorption behavior of water-ethanol mixtures was investigated on block copolymers of polydimethylsiloxane (PDMS}-polysulfone (PS) and of PDMS-PS-poly(4-hydroxystyrene) (PHS) as well as on PDMS. The preferential permeation of ethanol through PDMS membranes was attributed to both the preferential sorption of ethanol and rather small differences in the di!Tusivities between ethanol and water components (6.4 x 10-0 and 14x 10-6 cm 2 s-1 , respectively, at 25°C and an ethanol content in the feed (xE) of 10wt%). The block copolymers were considered to have microphase-separated structures, of which the continuous PDMS phase practically contributed to the permeation. The high sorption in the block copolymers was mainly attributed to the disperse phases and contributed little to the permeation. PDMS-PS-PHS block copolymers having PDMS weight fraction (wPDMs) of 0.6----0.7 showed permeabilities as high as commercial silicone rubber ( wPDMS = 0. 7) and a little lower selectivity of pervaporation (av= 7.7 at xE = IO wt%) as compared with that of PDMS (av =8.8-9.4). They were superior to PD MS-PS block copolymers (wPoMs =0.5-0.6) as for both the selectivity and the permeability. Composite membranes comprising a uniform ultrathin layer of a PDMS-SP-PHS block copolymer on a microporous support had fairly high performance (the permeation rate of 4.5 kg m -2 h -1 and av= 6.8) and durability in the pervaporation of a dilute ethanol solution.

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Section: Pervaporation and Sorption Through And Inmentioning

confidence: 99%

Pervaporation of Water-Ethanol Mixtures through Poly-dimethylsiloxane Block-Copolymer Membranes

Okamoto

Butsuen

Tsuru

et al. 1987

Polym J

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Synthesis of membranes for the dehydration of water‐acetic acid mixtures by pervaporation, 1. Polymer material selection

et al. 1987

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Poly(viny1 alcohol) (PVA) was studied for use as a basic material for membrane preparation with the aim of dehydrating water-acetic acid mixtures. Membranes of different nature were made by blending a PVA sample of 96% hydroxyl content with a polyacid or a polybase counterpolymer in water, followed by complete evaporation. The PVA-polybase blends gave membranes of low selectivity, unsuitable for dehydration. The membrane M , , made of a 1 : 1 (by wt.) blend of PVA with a special grade of polyhydroxycarboxylic acid (PHCl), presents a good combination of selectivity and permeability. It was studied in a water-acetic acid mixture containing up to 10 wt.-W of water. The Arrhenius-type activation energy for the permeation was found to be 9,O kcal/mol (38 kJ/mol).

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Investigations of poly(vinyl alcohol)/poly(N‐vinyl‐2‐pyrrolidone) blends, 1. Compatibility

1989

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Blends of crystallizable poly(viny1 alcohol) (PVA) with poly(N-vinyl-2-pyrrolidone) (PVP) made from aqueous solutions appear to be miscible in the whole composition range according to DSC results. A large negative value of the interaction parameter between the two polymers was found from melting point depressions. IR spectroscopy evidenced compatibility of the t w o polymers on a molecular level. DSC, density and IR results all show a proportion of pure PVA crystallites in blends, which decreases with increasing PVP content and becomes nil at about 50 wt.-% of PVP. However, close examination of the hydroxyl stretching region of the blends indicates the presence of organized regions of PVA beyond this limit. According to 1R results, the sequence of decreasing hydrogen-bonding power should be the following: multiple hydroxyl-hydroxyl bonding in organized PVA regions, hydroxyl-carbonyl bonding between [he two polymers, and simple hydrogen-hydrogen bonding in amorphous PVA regions. It appedrs that the PVA component can be held in the amorphous slate by hydrogen bonding with the PVP component when there is a sufficient amount of the latter in the blend. The amorphous part of PVA is compatible with PVP, but the crystallizable part is not in its most stable form.~2 5 -I I 6~/ 8 9 / $ n 3 .N

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Pervaporation of Water-Alcohol Mixture by Cellulose Nitrate-Poly (Methyl Acrylate) Blended Membranes

Cited by 9 publications

References 0 publications

Pervaporation of Water-Ethanol Mixtures through Poly-dimethylsiloxane Block-Copolymer Membranes

Pervaporation of Water-Ethanol Mixtures through Poly-dimethylsiloxane Block-Copolymer Membranes

Synthesis of membranes for the dehydration of water‐acetic acid mixtures by pervaporation, 1. Polymer material selection

Investigations of poly(vinyl alcohol)/poly(N‐vinyl‐2‐pyrrolidone) blends, 1. Compatibility

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