Separation of Benzene–Cyclohexane Azeotropic Mixture through Polymeric Membranes with Microphase Separated Structures

Terada, Junichi; Hohjoh, Tadashi; YOSHIMASU, Shiro; Ikemi, Masahisa; Shinohara, Isao

doi:10.1295/polymj.14.347

Cited by 46 publications

(12 citation statements)

References 9 publications

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“…6 The composition and flux of the permeate were determined by gas chromatography (Shimadzu GC-3BT Type). !-Propanol served as the internal standard for the determination of the permeated solvents.…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…The pervaporation rate and separation factor were defined in a previous paper as, P=w·8/a·t where w, 8, a and t denote the permeate flux, the membrane thickness, the membrane area and time, respectively. 6 Pervaporation using a liquid-polymer hybrid membrane was carried out as follows. After carbon tetrachloride as the liquid membrane was put on the HEA-AN graft copolymer membrane, ethanolwater as a feed solvent was injected into the liquid membrane and then pervaporation was started.…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…6 The swelling ratio of solvent in the polymer membrane S was defined as, where Wd and W, denote the weight of dry and solvent swollen membrane, respectively.…”

Section: Sorption Experimentsmentioning

confidence: 99%

“…Actually, a 2-hydroxyethyl acrylate graft copolymer membrane showed permselectivity for a benzene-cyclohexane azeotropic mixture because of its microdomain structure. 6 This paper describes a hybrid membrane to separate ethanol from an aqueous solution and investigates the effects of the microdomain structure of the polymer membrane on permselectivity. Carbon tetrachloride was used as the liquid membrane, and 2-hydroxyethyl acrylate (HEA) (AN) (backbone) graft copolymer, as the polymer membrane.…”

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confidence: 99%

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Permselectivity of Liquid–Polymer Hybrid Membrane Composed of Carbon Tetrachloride and 2-Hydroxyethyl Acrylate– Acrylonitrile Graft Copolymer for Ethanol–Water Mixture

Itoh

Ohkawa

Ishihara

et al. 1983

Polym J

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ABSTRACT:A membrane with selective permeability for ethanol was designed for the separation of ethanol from its aqueous solution by pervaporation on the basis of the difference in solubility between two components of the membrane. A liquid membrane was introduced to extend this difference and ethanol in the liquid membrane was isolated by the polymer membrane; that is, a liquid-polymer hybrid membrane was formed. Carbon tetrachloride was used as a liquid membrane, and 2-hydroxyethyl acrylate (HEA) (branch)-acrylonitrile (AN) (backbone) graft copolymer membrane was used as a polymer membrane. The effect of the microphase separated structure of the graft copolymer membrane on permselectivity was studied. The microdomain of the AN moiety displayed more dispersion and a smaller microdomain with decreasing chain length of the backbone polymer. It was found that the plasticizing effect was suppressed effectively by the microphase separated structure and the permselectivity of the graft copolymer membrane for ethanol was higher. When pervaporation of the ethanol-water mixture was carried out using the liquid-polymer hybrid membrane, ethanol completely permeated the liquid-polymer hybrid membrane.KEY Recently, a method has been found for ethanol production by the fermentation of starch, sugar, and cellulose. 1 This method requires a separation process, since ethanol is obtained in about a 5% aqueous solution. An enormous amount of energy is consumed by the distillation generally used for the separation of ethanol and this has prompted the development of a difference separation process. For a continuous and economical operation, a separation process using a polymer membrane has been found. This pervaporation method does not require isolation of the permeate and can be applied to various organic liquid mixtures. 2 Separation of an ethanol-water mixture using various polymer membranes by pervaporation has been reported. These generally involve water permeation through the membrane.3.4 However, it is more practical to permeate ethanol through the membrane since it is a minor component in the mixture produced by biomass.Permselectivity of the polymer membrane for the solvent takes place by two steps in the permeation process, i.e., dissolution and diffusion of the membrane. Therefore, the selectivity of a liquid mixture through the polymer membrane is a function of the difference in solubility and diffusivity of the solvents.5 However, in the case of ethanol permeation from an ethanol-water mixture, even if the solubility of ethanol toward the membrane is practical, the permselectivity of ethanol is not enhanced because of the poor diffusivity of ethanol owing to its molecular size. If a component with low diffusivity such as ethanol in an ethanol-water system is permeated selectively, it is necessary to design a 827

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Section: Pervaporation Experimentsmentioning

confidence: 99%

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…6 The swelling ratio of solvent in the polymer membrane S was defined as, where Wd and W, denote the weight of dry and solvent swollen membrane, respectively.…”

Section: Sorption Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Permselectivity of Liquid–Polymer Hybrid Membrane Composed of Carbon Tetrachloride and 2-Hydroxyethyl Acrylate– Acrylonitrile Graft Copolymer for Ethanol–Water Mixture

Itoh

Ohkawa

Ishihara

et al. 1983

Polym J

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“…In separation of the benzene-cyclohexane mixtures, Shinohara et al has reported that 2-hydroxyethyl methacrylate-methyl acrylate graft copolymer membranes 1 and 2-hydroxy-3-(diehtylamino)propyl methacrylate-styrene copolymer membranes with cyanuric choloride 2 exhibited excellent benzene permselectivity. In order to depress the swelling of polymer membranes caused by organic solvent, the hydrophilic polymers are used.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation separation of styrene-ethylbenzene mixture using poly(hexamethylene sebacate)-based polyurethane membranes

Cao

Kajiuchi

1999

J. Appl. Polym. Sci.

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A series of poly(hexamethylene sebacate) (PHS), with molecular weight in a range of 890 -2200, based polyurethanes (PU), were synthesized by solution polymerization with different kinds of isocyanate and chain extender and two kinds of polymerization methods. All the PHS-based PU membranes exhibited selectivity towards styrene during the pervaporation of styrene-ethylbenzene mixtures, and the properties of sorption and pervaporation were related to the composition of the PU membranes. Membranes with a low hard-segment content and by two-stage polymerization method exhibited high permselectivity.

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Pervaporation Separation of Benzene/Cyclohexane Mixtures by Poly(vinyl chloride) Membranes

Yıldırım

Hilmioğlu

Tulbentci

2001

Chem. Eng. Technol.

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Sorption and pervaporation of benzene/cyclohexane mixtures were studied by using poly(vinyl chloride) (PVC) polymer. The effects of composition of benzene/cyclohexane mixture and temperature on sorption and pervaporation characteristics were determined at 30, 40, and 50 °C for the membranes containing 8 wt% PVC polymer. Liquid feed composition effects on the flux and the selectivity were determined for two different membranes at 30 °C. The membranes that were prepared from the solutions containing 4 wt% and 8 wt% PVC polymer have thicknesses of 30 μm and 50 μm, respectively. Membrane thickness changes with polymer content as expected. Total sorption increased with increasing concentration of benzene. Increasing the concentration of benzene resulted in increasing flux as well as decreasing selectivity also. Fluxes were increased and selectivity decreased with increasing temperature. The selectivity was not affected significantly with varying amounts of polymer in the casting solution but the flux decreased with increasing amount of polymer in the casting solution.

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Separation of Benzene–Cyclohexane Azeotropic Mixture through Polymeric Membranes with Microphase Separated Structures

Cited by 46 publications

References 9 publications

Permselectivity of Liquid–Polymer Hybrid Membrane Composed of Carbon Tetrachloride and 2-Hydroxyethyl Acrylate– Acrylonitrile Graft Copolymer for Ethanol–Water Mixture

Permselectivity of Liquid–Polymer Hybrid Membrane Composed of Carbon Tetrachloride and 2-Hydroxyethyl Acrylate– Acrylonitrile Graft Copolymer for Ethanol–Water Mixture

Pervaporation separation of styrene-ethylbenzene mixture using poly(hexamethylene sebacate)-based polyurethane membranes

Pervaporation Separation of Benzene/Cyclohexane Mixtures by Poly(vinyl chloride) Membranes

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