Development of aromatic polyamide membranes for pervaporation and vapor permeation

Teng, Min-Yu; Lee, Kueir‐Rarn; Fan, Shu-Chin; Liaw, Der‐Jang; Huang, James; Lai, Juin‐Yih

doi:10.1016/s0376-7388(99)00206-9

Cited by 49 publications

(21 citation statements)

References 13 publications

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“…The results indicate that an increase in steric hindrance due to pendant group on the backbone prevailed over that of crosslink density. Similar phenomenon has been observed in the literature [39] for permeability of polymer possessing larger substituents [40].…”

Section: Resultssupporting

confidence: 90%

“…4 Comparison of the wide angle X-ray diffraction pattern for UV-cured methyl siloxane with cycloaliphatic substituted siloxanes hindrance due to pendant groups on the backbone prevailed over that of crosslink density. Similar phenomenon has been observed in literature [42] with permeability of polymers possessing larger substituents [40]. Pencil hardness of a cured film is related to the elongation at break, i.e.…”

Section: Resultssupporting

confidence: 85%

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Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

Chakraborty

Soucek

2010

Silicon

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Siloxanes with either methyl, cyclopentyl, or cyclohexyl groups were functionalized with methacrylate groups, then UV-cured using a free radical photo-initiator and a reactive diluent. Hexanediol dimethacrylate (0.1 wt%) was used as the reactive diluent. After curing, the mechanical, the viscoelastic, the coating, and the release properties of the cured films were studied. In addition, the oxygen permeability and the X-ray diffraction scans were evaluated. The crosslink density reduced with increase in siloxane substituent size. The oxygen permeability was dependent on crosslink density, and increased with increasing substituent size. The increase in permeability, and thus free volume, was supported by X-ray studies which showed an increase in d-spacing with increasing alkyl size. The hardness, adhesion, and solvent resistance increased as the size of the substituent increased (methyl to cyclopentyl to cyclohexyl) in the siloxane backbone. The adhesion and re-adhesion forces increased with an increase in size of the backbone substituents. There was also an increase in the advancing and the receding contact angles with the increase in substituent size.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 85%

Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

Chakraborty

Soucek

2010

Silicon

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“…The pervaporation apparatus was illustrated in our previous study. 29 The effective surface area of the membrane in direct contact with the feed solution was 11.64 cm 2 . The operating temperature (feed solution temperature) was 25 1C.…”

Section: Pervaporation Measurementmentioning

confidence: 98%

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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“…The advantages of VP are evident when the feed solution contains non-volatile or undissolved species. Some studies show that VP increases the permselectivity of water more than PV, as proved by the higher concentration of water present in the permeate [39], as well as higher fluxes being obtained under specific conditions [40]. Anyhow the flux could decrease when highly swollen membranes are used, such membranes favoring the PV process [41].…”

Section: Vapor Permeation (Vp)mentioning

confidence: 99%

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

2017

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Abstract:The development of processes based on the integration of new technologies is of growing interest to industrial catalysis. Recently, significant efforts have been focused on the design of catalytic membrane reactors to improve process performance. In particular, the use of membranes, that allow a selective permeation of water from the reaction mixture, positively affects the reaction evolution by improving conversion for all reactions thermodynamically or kinetically limited by the presence of water. In this paper, how pervaporation (PV) and vapor permeation (VP) technologies can improve the catalytic performance of reactions of industrial interest is considered. Specifically, technological approaches proposed in the literature are discussed with the aim of highlighting advantages and problems encountered in order to address research towards the optimization of membrane reactor configurations for liquid biofuel production in large scale.

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Development of aromatic polyamide membranes for pervaporation and vapor permeation

Cited by 49 publications

References 13 publications

Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

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

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

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