Improving CO2 permeability of ceramic hollow fibre-supported composite membranes by blending an ionic liquid in the Pebax/PEGDME selective layer

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2055-2064 ◽  
Author(s):  
Jun Cheng ◽  
Leiqing Hu ◽  
Yannan Li ◽  
Chaofan Ji ◽  
Junhu Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Hollow Fibre ◽  
Permeation Rate ◽  
Selective Layer

The ionic liquid [P66614][2-Op], with high CO2 capacity, was blended in the Pebax/PEGDME selective layer of the ceramic hollow fibre-supported composite membrane. CO2 permeation rate was improved by ~35% and high CO2/H2 selectivity was maintained.

scholarly journals Pressure effect during the formation of a selective layer on the structure and performance of dynamic composite membranes for pervaporation

2021 ◽  
Vol 65 (4) ◽  
pp. 431-438
Author(s):  
K. S. Burts ◽  
T. V. Plisko ◽  
A. V. Bildyukevich ◽  
G. Li ◽  
J. Kujawa ◽  
...  
Keyword(s):  
Contact Angle ◽  
Polymer Matrix ◽  
Composite Membrane ◽  
Substrate Surface ◽  
Composite Membranes ◽  
Feed Solution ◽  
Porous Membrane ◽  
Transmembrane Pressure ◽  
Dynamic Mode ◽  
Selective Layer

Composite membranes for pervaporation were prepared by forming a selective layer based on cross-linked polyvinyl alcohol (PVA) on the porous membrane-substrate surface in the dynamic mode (via PVA solution ultrafiltration). It was found that the pressure growth results in increasing the thickness of the composite membrane selective layer. Composite membrane contact angle, flux, water content in permeate in ethanol/water (mass ratio 90/10) pervaporation were revealed to have maximum values at 3–4 atm depending on the PVA concentration in the feed solution. It was shown that the revealed dependence of the contact angle, selectivity, and permeability on the pressure of the selective layer formation is due to the compaction of the polymer matrix-substrate under the action of the transmembrane pressure and its relaxation after pressure release. When using elevated pressures (more than 3–4 atm), the relaxation of the polymer matrix causes the microdefect to form as a result of deformation of the selective layer.

scholarly journals High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1213
Author(s):  
Ilya Borisov ◽  
Ivan Podtynnikov ◽  
Evgenia Grushevenko ◽  
Olga Scharova ◽  
Tatiana Anokhina ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Separation Factor ◽  
Concentration Polarization ◽  
Composite Membranes ◽  
Methyl Tert Butyl Ether ◽  
Side Chain ◽  
Butyl Ether ◽  
Water Separation ◽  
Selective Layer ◽  
First Time

For the first time, the effect of the side-chain in polyalkylmethylsiloxane towards pervaporative removal of methyl tert-butyl ether (MTBE) from water was studied. The noticeable enhancement of separation factor during the pervaporation of 1 wt.% MTBE solution in water through the dense film (40–50 µm) can be achieved by substitution of a methyl group (separation factor 111) for heptyl (161), octyl (169) or decyl (180) one in polyalkylmethylsiloxane. Composite membrane with the selective layer (~8 µm) made of polydecylmethylsiloxane (M10) on top of microfiltration support (MFFK membrane) demonstrated MTBE/water separation factor of 310, which was 72% greater than for the dense film (180). A high separation factor together with an overall flux of 0.82 kg·m−2·h−1 allowed this M10/MFFK composite membrane to outperform the commercial composite membranes. The analysis of the concentration polarization modulus and the boundary layer thickness revealed that the feed flow velocity should be gradually increased from 5 cm·s−1 for an initial solution (1 wt.% of MTBE in water) to 13 cm·s−1 for a depleted solution (0.2 wt.% of MTBE in water) to overcome the concentration polarization phenomena in case of composite membrane M10/MFFK (Texp = 50 °C).

scholarly journals Long-Term Stable 1-butyl-3-methylimidazolium Hexafluorophosphate/Ag Metal Composite Membranes for Facilitated Olefin Transport

Membranes ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 191 ◽  
Author(s):  
Sang Wook Kang
Keyword(s):  
Ionic Liquid ◽  
Phase Separation ◽  
Composite Membrane ◽  
Photoelectron Spectroscopy ◽  
Composite Membranes ◽  
Separation Performance ◽  
Metal Composite ◽  
X Ray ◽  
Long Term Stability

For the preparation of long-term stable ionic liquid/Ag nanoparticles composites, we compared the separation performance of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4−)/Ag, and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM+PF6−)/Ag composite membranes with time. Separation performance showed that the BMIM+PF6−/Ag metal composite membrane was more stable than the BMIM+BF4−/Ag metal composite membrane for more than 160 h. These differences in long-term stability in BMIM+PF6−/Ag and BMIM+BF4−/Ag metal composite membranes was attributable to the phase separation between ionic liquid and nanoparticles. In particular, the phase separation between ionic liquid and silver nanoparticles was not observed with time in hydrophobic ionic liquid BMIM+PF6−, confirmed by X-ray photoelectron spectroscopy.

Removal of trichloroethylene and trichloroethane using a novel hollow-fibre gas-permeable membrane

2003 ◽  
Vol 3 (5-6) ◽  
pp. 67-72
Author(s):  
S. Takizawa ◽  
T. Win
Keyword(s):  
Boundary Layer ◽  
Flow Regime ◽  
Removal Efficiency ◽  
Residence Time ◽  
Flow Rate ◽  
Air Flow ◽  
Hollow Fibre ◽  
Permeation Rate ◽  
Permeable Membrane ◽  
Diffusional Boundary Layer

In order to evaluate effects of operational parameters on the removal efficiency of trichloroethylene and 1,1,1-trichloroethene from water, lab-scale experiments were conducted using a novel hollow-fibre gaspermeable membrane system, which has a very thin gas-permeable membrane held between microporous support membranes. The permeation rate of chlorinated hydrocarbons increased at higher temperature and water flow rate. On the other hand, the effects of the operational conditions in the permeate side were complex. When the permeate side was kept at low pressure without sweeping air (pervaporation), the removal efficiency of chlorinated hydrocarbon, as well as water permeation rate, was low probably due to lower level of membrane swelling on the permeate side. But when a very small amount of air was swept on the membrane (air perstripping) under a low pressure, it showed a higher efficiency than in any other conditions. Three factors affecting the permeation rate are: 1) reduction of diffusional boundary layer within the microporous support membrane, 2) air/vapour flow regime and short cutting, and 3) the extent of membrane swelling on the permeate side. A higher air flow, in general, reduces the diffusional boundary layer, but at the same time disrupts the flow regime, causes short cutting, and makes the membrane dryer. Due to these multiple effects on gas permeation, there is an optimum operational condition concerning the vacuum pressure and the air flow rate. Under the optimum operational condition, the residence time within the hollow-fibre membrane to achieve 99% removal of TCE was 5.25 minutes. The log (removal rate) was linearly correlated with the average hydraulic residence time within the membrane, and 1 mg/L of TCE can be reduced to 1 μg/L (99.9% removal).

Polybenzimidazole and ionic liquid composite membranes for high temperature polymer electrolyte fuel cells

2021 ◽  
Vol 361 ◽  
pp. 115569
Author(s):  
Bingbing Niu ◽  
Shijing Luo ◽  
Chunling Lu ◽  
Wendi Yi ◽  
Jiantao Liang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fuel Cells ◽  
High Temperature ◽  
Polymer Electrolyte ◽  
Composite Membranes ◽  
Polymer Electrolyte Fuel Cells

Composite membranes based on polybenzimidazole and ionic liquid functional Si–O–Si network for HT-PEMFC applications

2017 ◽  
Vol 42 (34) ◽  
pp. 21913-21921 ◽  
Author(s):  
Xue Tian ◽  
Shuang Wang ◽  
Jinsheng Li ◽  
Fengxiang Liu ◽  
Xu Wang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Composite Membranes

scholarly journals Towards Biohydrogen Separation Using Poly(Ionic Liquid)/Ionic Liquid Composite Membranes

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 124 ◽  
Author(s):  
Andreia S.L. Gouveia ◽  
Lucas Ventaja ◽  
Liliana C. Tomé ◽  
Isabel M. Marrucho
Keyword(s):  
Ionic Liquid ◽  
High Performance ◽  
Cost Effective ◽  
Clean Energy ◽  
Composite Membranes ◽  
Feed Pressure ◽  
Starting Point ◽  
Poly Ionic Liquid ◽  
Separation Performances ◽  
H2 Selectivity

Considering the high potential of hydrogen (H2) as a clean energy carrier, the implementation of high performance and cost-effective biohydrogen (bioH2) purification techniques is of vital importance, particularly in fuel cell applications. As membrane technology is a potentially energy-saving solution to obtain high-quality biohydrogen, the most promising poly(ionic liquid) (PIL)–ionic liquid (IL) composite membranes that had previously been studied by our group for CO2/N2 separation, containing pyrrolidinium-based PILs with fluorinated or cyano-functionalized anions, were chosen as the starting point to explore the potential of PIL–IL membranes for CO2/H2 separation. The CO2 and H2 permeation properties at the typical conditions of biohydrogen production (T = 308 K and 100 kPa of feed pressure) were measured and discussed. PIL–IL composites prepared with the [C(CN)3]− anion showed higher CO2/H2 selectivity than those containing the [NTf2]− anion. All the membranes revealed CO2/H2 separation performances above the upper bound for this specific separation, highlighting the composite incorporating 60 wt% of [C2mim][C(CN)3] IL.

Nafion/PBI Nanofiber Composite Membranes for Fuel Cells Applications

2010 ◽  
Author(s):  
Tzyy-Lung Leon Yu ◽  
Shih-Hao Liu ◽  
Hsiu-Li Lin ◽  
Po-Hao Su
Keyword(s):  
Thin Film ◽  
Fuel Cell ◽  
Composite Membrane ◽  
Fiber Composite ◽  
Composite Membranes ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Membrane Thickness ◽  
Fuel Cell Performance ◽  
Nano Fiber

The PBI (poly(benzimidazole)) nano-fiber thin film with thickness of 18–30 μm is prepared by electro-spinning from a 20 wt% PBI/DMAc (N, N′-dimethyl acetamide) solution. The PBI nano-fiber thin film is then treated with a glutaraldehyde liquid for 24h at room temperature to proceed chemical crosslink reaction. The crosslink PBI nano-fiber thin film is then immersed in Nafion solutions to prepare Nafion/PBI nano-fiber composite membranes (thickness 22–34 μm). The morphology of the composite membranes is observed using a scanning electron microscope (SEM). The mechanical properties, conductivity, and unit fuel cell performance of membrane electrode assembly (MEA) of the composite membrane are investigated and compared with those of Nafion-212 membrane (thickness ∼50 μm) and Nafion/porous PTFE (poly(tetrafluoro ethylene)) composite membrane (thickness ∼22 μm). We show the present composite membrane has a similar fuel cell performance to Nafion/PTFE and a better fuel cell performance than Du Pont Nafion-212.

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