Ionic liquid as a solvent and the long-term separation performance in a polymer/silver salt complex membrane

Kang, Sang Wook; Char, Kook Heon; Kim, Jong Hak; Kang, Yong Soo

doi:10.1007/bf03218769

Cited by 26 publications

(16 citation statements)

References 20 publications

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“…Permeation tests were performed in a stainless steel separation module as described elsewhere. [8][9][10] The flow rate of the mixed gas and sweep gas (helium) were controlled using mass flow controllers. The gas flow rates represented by gas permeance were determined using a soup bubble flow meter.…”

Section: Methodsmentioning

confidence: 99%

“…[5][6][7] Among such membranes, solid polymer electrolytes consisting of silver ions dissolved in a polymer solvent have recently attracted much interest for olefin/paraffin separation due to their remarkable separation performance in the solid state. [8][9][10][11][12][13][14][15][16][17][18][19][20] Polymers such as poly(2-ethyl-2-oxazoline) (POZ), poly(ethylene oxide) (PEO) and poly(vinyl pyrrolidone) (PVP) which contain polar groups in their chains have been used as a polymer matrix to dissolve the silver salts with low lattice energy such as AgBF 4 , AgClO 4 and AgCF 3 SO 3 for facilitated olefin transport membranes.…”

Section: Introductionmentioning

confidence: 99%

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Selective coordination of silver ions to poly(styrene-b-(ethylene-co-butylene)-b-styrene) and its influence on morphology and facilitated olefin transport

2008

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The π-complex membranes of poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) of two silver salts of AgBF 4 and AgCF 3 SO 3 were prepared and tested for the separation of the propylene/propane mixtures. The Fouriertransform infrared (FT-IR) spectra of these complexes showed that the silver salts were dissolved in SEBS up to a silver mole fraction of 0.14, due to π-complexation between the aromatic C=C bonds of styrene blocks and silver ions. Above this solubility limit, ion pairs and high-order ionic aggregates began to form, so that silver salts were distributed unselectively in both the EB and PS blocks. The domain size of the PS blocks was enlarged up to this critical concentration with increasing silver concentration without structural transitions, as confirmed by small angle x-ray scattering (SAXS). These structural properties of the SEBS/silver salt complexes may explain the lower separation properties for propylene/propane mixtures compared to poly(styrene-b-butadiene-b-styrene)(SBS)/silver salt complex membranes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective coordination of silver ions to poly(styrene-b-(ethylene-co-butylene)-b-styrene) and its influence on morphology and facilitated olefin transport

2008

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“…13 Facilitated olefin transport membranes consist of polymer having the functional group and silver salt capable of reacting with olefin molecules reversibly. [14][15][16][17] For example, the silver polymer electrolyte membranes consisting of AgBF 4 or AgCF 3 SO 3 dissolved in either poly(2-ethyl-2-oxazoline) (POZ), poly (N-vinyl pyrrolidone) (PVP) or poly(ethylene oxide) (PEO) showed that the mixed gas selectivity of propylene over propane reached 45 and the mixed gas permeance up to 12 GPU (1 GPU=1×10 -6 cm 3 (STP)/cm 2 s cmHg). 14 However, the membranes of polymer complexes with AgBF 4 or AgCF 3 SO 3 frequently showed the deterioration of separation performance by means of the reduction of silver ions to silver nanoparticles with time.…”

Section: Introductionmentioning

confidence: 99%

Effect of 1-butyl-3-methylimidazolium nitrate on separation properties of polymer/AgNO3 membranes for propylene/propane mixtures: Comparison between poly(2-ethyl-2-oxazoline) and poly(ethylene oxide)

2011

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A previous study showed that ionic liquids enable AgNO 3 , which is not readily reduced to silver nanoparticles in the solid state, to be an active olefin carrier in silver polymer electrolyte membranes. We report the effects of an ionic liquid, i.e. 1-butyl-3-methylimidazolium nitrate (BMIM + NO 3 -), on the separation properties of polymer/AgNO 3 complex membranes for propylene/propane mixtures. Interestingly, the change in membrane separation properties with the ionic liquid concentration was completely different between poly(2-ethyl-2-oxazoline) (POZ) and poly(ethylene oxide) (PEO). In the POZ/AgNO 3 complex membranes, both the selectivity of propylene/propane and the mixed gas permeance increased up to a 0.1 mole ratio of ionic liquid, after which they decreased. The enhancement of the membrane performance results from an increase in the silver ion activity, whereas the decrease was attributed to the barrier effect of large amounts of IL and less effectiveness of IL in controlling the ionic interactions. On the other hand, in the PEO/AgNO 3 membranes, the selectivity increased with increasing ionic liquid, whereas the mixed gas permeance decreased. The increase in selectivity comes from the enhanced silver ion activity, whereas the decrease in permeance was attributed to the decrease in interfacial voids in the membranes.

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“…[2][3][4] Characteristics such as: high thermal stability, low viscosity, excellent microwave absorbing ability, designable structures, high ionic conductivity, wide liquid range, low vapor pressure and an excellent ability to dissolve organic compounds, salts and metals, make ILs extremely useful reaction media, which are becoming increasingly important technologically. [2][3][4][5][6][7][8] Room-temperature ILs, especially those based on the 1-n-alkyl-3-methylimidazolium cation, have shown great promise as an attractive alternative to conventional solvents. They provide an eco-friendly reaction medium for a variety of organic transformations as well as macromolecules synthesis, as they are non-volatile, recyclable, non-explosive, easy to handle, thermally robust, and in addition, they are compatible with various organic compounds and organometallic reagents.…”

Section: Introductionmentioning

confidence: 99%

A study of the ionic liquid mediated microwave heating for the synthesis of new thermally stable and optically active aromatic polyamides under green procedure

Mallakpour

Dinari

2010

Macromol. Res.

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Ionic liquids (ILs) of the 1,3-dialkylimidazolium-type have great potential for the innovative application of microwaves in synthesis and separation. The use of ILs as reagents in conjunction with microwave heating makes it possible to prepare new organsoluble optically active aromatic polyamides (PAs) by a direct polycondensation reaction of our synthesized dicarboxylic acid: (2S)-4-[(4-methyl-2-phthalimidylpentanoylamino)benzoylamino]-isophthalic acid (9), with several aromatic diamines. The polymerization reactions provided chiral PAs in high yield and inherent viscosities in the range of 0.43-0.85 dLg -1 . The chemical structures of some of these samples as representatives were characterized by 1 H NMR and elemental analysis. All polymers were characterized by FTIR and specific rotation tools. Their thermal properties were determined by differential scanning calorimetry and thermogravimetric analysis. The efficiency of microwave irradiation conjugated with ILs was compared with that of the polycondensation of this monomer in ILs using conventional heating. The results showed that much shorter reaction times, higher yields and inherent viscosities were obtained under microwave assisted conditions. Furthermore, the use of ILs as a media and catalyst for the above polymerization reactions will eliminate the need of volatile and toxic solvents and reagents as condensing agents and provide a environmentally benign process.

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Ionic liquid as a solvent and the long-term separation performance in a polymer/silver salt complex membrane

Cited by 26 publications

References 20 publications

Selective coordination of silver ions to poly(styrene-b-(ethylene-co-butylene)-b-styrene) and its influence on morphology and facilitated olefin transport

Selective coordination of silver ions to poly(styrene-b-(ethylene-co-butylene)-b-styrene) and its influence on morphology and facilitated olefin transport

Effect of 1-butyl-3-methylimidazolium nitrate on separation properties of polymer/AgNO3 membranes for propylene/propane mixtures: Comparison between poly(2-ethyl-2-oxazoline) and poly(ethylene oxide)

A study of the ionic liquid mediated microwave heating for the synthesis of new thermally stable and optically active aromatic polyamides under green procedure

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