Kingdom of Saudi Arabia

Ismail, Russayani; Lai, Yew Meng; Ayub, Zainal Amin; Ahmad, Anuar; Wan, Chang Da

doi:10.1007/978-981-10-1056-9_7

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…It is necessary to determine the optimum polymer concentration of the casting solution to obtain defect‐free asymmetric membranes for the gas separation process . On the other hand, altering the polymer concentration in the casting solution is one of the most important procedures to optimise the performance of the asymmetric membranes…”

Section: Resultsmentioning

confidence: 99%

“…%. The change in the porosity of the membrane resulted in a more resistant skin and sub‐layer and subsequently a more selective and less permeable membrane …”

Section: Resultsmentioning

confidence: 99%

“…Parameters such as the concentration of polymer in coating solution, the solvent used for preparation of the coating solution, thickness of the coating layer, number of sequential coatings and heat treatment processes can considerably influence gas separation properties of the skin layer. Ultimately, the operating parameters including the feed temperature, feed pressure, and composition of the feed significantly influence the gas permeability properties and the separation factor of an asymmetric membrane in gas separation process . The feed containing H 2 S were not investigated in earlier studies and the effects of operational parameter for H 2 S containing feed were not discussed in pervious papers for PDMS coated PES membranes.…”

Section: Introductionmentioning

confidence: 99%

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PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

2014

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The present study is an attempt to investigate the effects of preparation and operation parameters on ideal and real selectivity of polydimethylsiloxane (PDMS) coated asymmetric polyethersulfone (PES) membranes for natural gas sweetening. Scanning electron microscopy (SEM) was used to study the effect of PES concentration and solvent type on membrane morphology. The effects of operating parameters on the performance of membranes were investigated by using binary CO 2 /CH 4 , H 2 S/CH 4 and ternary H 2 S/CO 2 /CH 4 gas mixtures. Higher concentrations of PES and a higher sequential coating number increase CO 2 /CH 4 selectivity and decrease CO 2 permeance. As a notable and interesting result, the membrane exhibits rubbery PDMS behaviour for H 2 S containing feeds and displays a glassy PES membrane for CO 2 /CH 4 mixed gas. An increase in the feed pressure decreases CO 2 and CH 4 permeance and increases CO 2 /CH 4 selectivity for CO 2 /CH 4 feed. For H 2 S/CH 4 and H 2 S/CO 2 /CH 4 mixed gas, enhancing the feed pressure results in higher CH 4 and lower CO 2 and H 2 S permeance and a declined CO 2 /CH 4 and H 2 S/CH 4 selectivity. Increasing temperature in binary CO 2 /CH 4 enhances CO 2 and CH 4 permeance and decreases CO 2 /CH 4 selectivity. Increasing the temperature increases CH 4 permeance and decreases H 2 S permeance for binary H 2 S/CH 4 mixture. For ternary mixture, increasing the temperature leads to a higher permeance for CO 2 and H 2 S and a lower CH 4 permeance. For binary CO 2 /CH 4 , a higher CO 2 concentration increases the membrane gas permeance and decreases CO 2 /CH 4 selectivity. Increasing the H 2 S concentration in the feed results in a reduction in gas pressure normalised flux of gases in ternary gas feed because of an increase in Flory-Huggins interaction parameter.

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Section: Resultsmentioning

confidence: 99%

“…%. The change in the porosity of the membrane resulted in a more resistant skin and sub‐layer and subsequently a more selective and less permeable membrane …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

2014

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“…The progression of mixed matrix membranes (MMMs) in the field of membrane science and technology is of great interest due to their importance in gas separation processes . In the gas separation field, polymeric membranes occupy a special place because of their admirable intrinsic transport properties, cost effectiveness, and relative ease of possession . However, it is difficult to attain improvement in terms of permeability and selectivity since trade‐off limit between these parameters has been seemingly reached .…”

Section: Introductionmentioning

confidence: 99%

Modelling in mixed matrix membranes for gas separation

et al. 2014

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Various gas permeation models including Maxwell model, Bruggeman model, Lewis‐Nielson model and Pal model were compared via a modelling approach with the relative permeance of CO2 against published experimental data on silica filled polysulfone/polyimide (PSF/PI) mixed matrix membranes (MMMs). However, none of the tested models were able to predict the data with good accurately. A closer look at the cross‐sectional image by scanning electron microscopy (SEM) indicated that the fillers were actually prolate ellipsoids dispersed within the matrix. Maxwell‐Wagner‐Sillar model was then employed to investigate the prolate effect and it was observed that the optimization curves of maximum packing (φm) and shape factor (n) showed least deviations. The percentage average absolute relative error (AARE %) value for fitted shape factor (nf) was found to be in the range of 1.12–2.17 at 2–10 bar pressure which showed its robustness. A further evaluation from SEM image showed that the shape factor along z‐direction (nz) displayed a minimum deviation of 17.52 % for prolates at 0.102 ± 0.01. By using nz as upper limit and estimated shape factor ne through generalization, the error was reduced to 6.01 %. The AAR % deviation was found in the order of nf

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“…With the dry/wet phase separation technique, asymmetric membrane with defect free effective skin layer in the range 200–1000 Å can be prepared . Simultaneous optimization of the properties of the skin layer and the substructure is however a very challenging task . Moreover, films with thickness <1 μm shows permeation behaviors different from the intermediate thickness (2.5 μm) or thick films .…”

Section: Introductionmentioning

confidence: 99%

Preparation and gas transport properties of dual‐layer polysulfone membranes for high pressure CO₂ removal from natural gas

Ahmad

Adewole

Leo

et al. 2014

J of Applied Polymer Sci

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Permeability, sorption, and plasticization behaviors of dual‐layer composite membrane were studied. Polysulfone containing 10.7 wt % glycerol as additive was used for preparing a microporous membrane support. A thin top selective layer was prepared using diethylene glycol dimethyl ether as casting solvent. The overall performance of the membrane was evaluated using Scanning Electron Microscopy, and permeation and sorption tests at pressure up to 50 bar. The prepared membrane displayed high permeability at low pressure which gradually decreased with increase in pressure. Permeability of CO2 was determined to be 84.97 Barrer at 2 bar. Membrane did not show any plasticization tendency up to the experimental pressure of 40 bar. Plasticization pressure and permeability at plasticization pressure were estimated to be 41.07 bar and 6.03 Barrer, respectively. The improved performance of the membrane is associated to the synergistic properties of the two layers prepared from different formulations of the same polymer. Thus, the dual‐layer flat sheet configuration displayed a potential in high pressure CO2 removal from natural gas. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40924.

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Kingdom of Saudi Arabia

Cited by 6 publications

References 3 publications

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

Modelling in mixed matrix membranes for gas separation

Preparation and gas transport properties of dual‐layer polysulfone membranes for high pressure CO₂ removal from natural gas

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Kingdom of Saudi Arabia

Cited by 6 publications

References 3 publications

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

Modelling in mixed matrix membranes for gas separation

Preparation and gas transport properties of dual‐layer polysulfone membranes for high pressure CO2 removal from natural gas

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Product

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Preparation and gas transport properties of dual‐layer polysulfone membranes for high pressure CO₂ removal from natural gas