Pervaporation of aqueous ethanol solutionthrough poly(amidesulfonamide)s (PASAs) membranes

Chan, Wai-Yip; Ng, Ching Fai; Lam‐Leung, Suei Yee; He, Xumin

doi:10.1016/s0032-3861(97)00557-0

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…This process is commonly classified into three different groups depending on the feed type and aim of the separation: hydrophilic, hydrophobic and target organophilic pervaporation [1]. Among them the most studied process is pervaporation with hydrophilic membranes, which involves either dehydration of organic compounds or water extraction from a mixture [2][3][4]. On the other hand, hydrophobic pervaporation could be of potential use in the industry, as an easy and economical method of either organic solvents recovery, removal of alcohol form alcoholic beverages, or recovery of aroma compounds from fruit juices [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Performance of PDMS membranes in pervaporation: Effect of silicalite fillers and comparison with SBS membranes

Dobrak

Figoli

Chovau

et al. 2010

Journal of Colloid and Interface Science

115

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Section: Introductionmentioning

confidence: 99%

Performance of PDMS membranes in pervaporation: Effect of silicalite fillers and comparison with SBS membranes

Dobrak

Figoli

Chovau

et al. 2010

Journal of Colloid and Interface Science

115

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“…The general procedure for the preparation of pervaporation membranes was previously described. 6 The thickness of the membranes was kept at around 30 m. Prior to the pervaporation experiments, the membrane was preconditioned in the feed solution for at least 4 h. The pervaporation apparatus used in this work was the same as reported in the previous study, 6,8 with the effective membrane area in the cell being 33.18 cm 2 . The membrane was supported by a filter paper over a perforated metal disc of 6.5 cm in diameter.…”

Section: Membrane Preparation and Pervaporation Experimentsmentioning

confidence: 99%

“…For glassy polymers such as PASAs, pervaporation is believed to be a diffusion-controlled process. 7,8 One of the rational thoughts to increase the diffusivity of these materials is to trim down their degree of crystallinity. The present work represents our effort to achieve this goal by copolymerizing 1A or 1B with a mixture of terephthaloyl and isophthaloyl chlorides.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and pervaporation performance of random copolymers of poly(amidesulfonamide)s (PASAs)

Chan

Lam

et al. 1998

J. Appl. Polym. Sci.

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Stimulated by the outstanding membrane properties of poly(amidesulfonamide)s (PASAs), 2 series of copolymers were synthesized by low-temperature solution polycondensation of either the diamino monomer N, or N,NЈ-bis(4-aminophenylsulfonyl)-2,5-dimethylpiperazine (1B) with a mixture of isophthaloyl and terephthaloyl chloride. All of these copolymers were adequately characterized by intrinsic viscosity measurements, infrared (IR) spectroscopy, 1 H and 13 C nuclear magnetic resonance, differential scanning calorimetry, thermogravimetric analysis, and wide-angle X-ray diffraction. The effects of various feed ratios of isophthaloyl-terephthaloyl chloride on the physical properties of the copolymers were investigated. In particular, the crystallinity of PASA copolymers was found to be trimmed down by copolymerizing diamino monomer 1A or 1B with increasing fraction of isophthaloyl chloride. It was envisioned that when the crystallinity of the PASA membranes decreased, permeation flux would be preferably increased at a minimum sacrifice of separation characteristics in the pervaporation process. Experimental findings, however, revealed that the resulting permeation flux and separation factor of pervaporation membranes derived from various copolymers were both within the same order of magnitude.

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“…In pervaporation separation processes, polyamides show high selectivity in alcohol dehydration for a wide range of water concentrations. [1][2][3][4][5] Their high selectivity stems from the concept of high diffusion selectivity. This is because they have low free volume/low mobility and the size of water molecules is smaller than that of alcohol.…”

Section: Introductionmentioning

confidence: 99%

Interfacially polymerized thin-film composite polyamide membrane: positron annihilation spectroscopic study, characterization and pervaporation performance

Kao

Huang

Liaw

et al. 2010

Polym J

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To improve the pervaporation performance of polyamide membrane, thin-film composite (TFC) polyamide membranes were prepared through the interfacial polymerization between m-phenylenediamine (MPDA) or 1,3-phenylenediamine-4-sulfonic acid (MPDASA) and trimesoyl chloride (TMC) on the surface of the modified asymmetric polyacrylonitrile (mPAN) membrane and applied in the pervaporation separation of 70 weight % aqueous isopropanol solutions at 25 1C. The variations in the free volume and the thickness of the active polyamide layer of composite membrane were obtained by positron annihilation spectroscopy (PAS) experiments, in which a variable monoenergy slow-positron beam was used. FTIR-ATR spectroscopy, XPS, scanning electron microscopy, AFM and water contact angle measurements were applied to analyze chemical structures, surface elemental compositions, morphologies, surface roughness and hydrophilicity of the active polyamide layer of composite membrane. From the result of PAS experiments, the S parameter (corresponding to the free volume size and amount) and the thickness of the active polyamide MPDASA-TMC/mPAN layer were found to be lower than those of the active MPDA-TMC/mPAN layer. In the aqueous isopropanol solution dehydration, the MPDASA-TMC/mPAN membrane exhibited a higher permeation rate than but maintained the same water concentration in the permeate as did the MPDA-TMC/mPAN membrane. This is in good agreement with the analysis by PAS. Polymer Journal (2010) 42, 242-248; doi:10.1038/pj.2009.334; published online 13 January 2010Keywords: interfacial polymerization; PAS; pervaporation; polyamide; TFC membrane INTRODUCTION Polyamides have been studied as suitable membrane materials because of their high thermal stability, excellent mechanical strength and high resistance to organic solvents. Alcohol dehydration is one of the important areas in pervaporation separation processes. In pervaporation separation processes, polyamides show high selectivity in alcohol dehydration for a wide range of water concentrations. 1-5 Their high selectivity stems from the concept of high diffusion selectivity. This is because they have low free volume/low mobility and the size of water molecules is smaller than that of alcohol. However, they show low permeation rate because of their very low free volume and low water solubility. To increase the permeation rate of polyamide membranes without sacrificing selectivity, the membrane morphology must be converted from a dense thick film into an asymmetric or composite

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Pervaporation of aqueous ethanol solutionthrough poly(amidesulfonamide)s (PASAs) membranes

Cited by 14 publications

References 20 publications

Performance of PDMS membranes in pervaporation: Effect of silicalite fillers and comparison with SBS membranes

Performance of PDMS membranes in pervaporation: Effect of silicalite fillers and comparison with SBS membranes

Synthesis, characterization, and pervaporation performance of random copolymers of poly(amidesulfonamide)s (PASAs)

Interfacially polymerized thin-film composite polyamide membrane: positron annihilation spectroscopic study, characterization and pervaporation performance

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