The optimal point within the Robeson upper boundary

Castro-Dominguez, Bernardo; Leelachaikul, Pornravee; Messaoud, Souha Belhaj; Takagaki, Atsushi; Sugawara, Takashi; Kikuchi, Ryuji; Oyama, S. Ted

doi:10.1016/j.cherd.2015.03.002

Cited by 17 publications

(9 citation statements)

References 29 publications

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“…The combined effect of solubility and diffusivity is a higher permeability of CO 2 and a higher CO 2 /CH 4 permselectivity (PS) in the composite than in either the bulk IL or the iPAF itself. We plot CO 2 permeability versus CO 2 /CH 4 selectivity in Figure , together with the 2008 Robeson upper bound . The simulated data for the bulk IL are in good agreement with the experiment.…”

Section: Resultsmentioning

confidence: 99%

“…Efficient gas separations are essential to the chemical industry and environmental remediation. Membrane-based technology has become particularly appealing due to their energy efficiency and small footprint. − Traditional membrane separation via polymers is governed by the solution-diffusion mechanism, leading to a trade-off between permeability and selectivity called the Robeson upper bound. , Materials with specific affinity to a permeate molecule and uniform nanoscale pores are supposed to circumvent the limit. , …”

Section: Introductionmentioning

confidence: 99%

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Confined Ionic Liquid in an Ionic Porous Aromatic Framework for Gas Separation

Tian

Dai

Jiang

2018

ACS Appl. Polym. Mater.

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Ionic liquids (ILs) and porous frameworks are commonly employed in gas separation, but rarely together. To leverage their combined advantages, we designed a novel system comprising an ionic liquid inside a charged porous-polymer framework. A positively charged ionic porous aromatic framework was impregnated with an ionic liquid to confine the cations and anions inside the polymeric framework via electrostatic interactions. Molecular dynamics and free energy simulations were performed to determine the solubility, diffusivity, and hence permeability of CO2 and CH4 through the composite material. We found that the polymeric framework introduces nanoscale space in the confined IL, improving gas solubility, while the IL promotes gas transport in the porous structure. The confinement impacts CO2 and CH4 very differently regarding their solubility and diffusivity. Through tuning of the ionic-liquid loading, both high CO2 permeability and high CO2/CH4 selectivity could be achieved, overcoming the Robeson upper bound. This work highlights the advantages of confined ionic liquids in an ionic porous-polymer framework in enhancing selective gas separation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Confined Ionic Liquid in an Ionic Porous Aromatic Framework for Gas Separation

Tian

Dai

Jiang

2018

ACS Appl. Polym. Mater.

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“…In light of the above results, reducing Pd layer thickness not only lowers the FCI and TCI of separation modules but also decreases the LC by increasing hydrogen production, allowing economic performance of separation modules to exhibit more appealing characteristics. A similar behavior has been shown in polymeric membranes where high gas permeability values dominate economic performance outcomes …”

Section: Resultsmentioning

confidence: 99%

“…A similar behavior has been shown in polymeric membranes where high gas permeability values dominate economic performance outcomes. 44 Furthermore, within the experimental range of Pd layer thickness values tested, Figure 9 shows a comparative appraisal of LC for the various Pd layer thickness values on the average and expected value level as well as levels of probability associated with value at risk and the value at opportunity. In Figure 9, the upper P 95 line (a possible means of identifying "risk") graphically shows that there is a 5% probability of incurring a cost higher than the value on the line, and similarly, the lower P 5 line (a possible means of quantifying "opportunity") graphically shows the 5% probability of incurring a cost lower than the value of the line.…”

Section: Economic Performance Assessment Of Pd-based Separation Modul...mentioning

confidence: 99%

Integrated Experimental–Technoeconomic Analysis of the Lifetime of Pd–Au Membranes

Castro-Dominguez

Mardilovich

et al. 2016

Ind. Eng. Chem. Res.

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Palladium and palladium/alloy membranes have shown to be an effective technology option for the production of pure hydrogen. In particular, Pd/Au membranes have displayed superior chemical stability and separation performance. However, the lack of industrial operating experience gives rise to technological uncertainties such as the lifetime of the membranes which could potentially prevent the deployment of this new technology option. In light of the above recognition, the primary aim of the present research work is to combine long-term H2 membrane permeance and He leak characterization tests (cumulative testing over 2.2 years) conducted to estimate the lifetime of composite asymmetric Pd/Au membranes at different thicknesses with a comprehensive economic performance assessment framework in the presence of inherent trade-offs between permeance, thickness, and membrane lifetime. The experimental results are depicted in terms of the produced H2 purity and flux at different testing times and various membrane thickness values. Using these experimental results, the lifetime of the membranes is estimated and integrated into the proposed economic assessment framework. The economic evaluation framework for H2 separation units is structured in a way that explicitly recognizes various uncertainty sources via Monte Carlo simulation techniques and assesses economic performance based on metrics such as fixed capital investment (FCI), total capital investment (TCI), total product cost (TPC), and the levelized H2 cost (LC). It is shown that the expected values of the derived FCI/TCI and LC profiles increase as the Pd layer thickness increases while the TPC profile decreases with higher Pd layer thicknesses. Finally, tornado diagrams for the LC are generated to characterize comparatively the importance of H2 permeance and membrane lifetime on the membrane system’s economic performance profile.

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“…It is essential to mention that the permeability and selectivity for a membrane material are not independent based on Robeson upper bound. Therefore, membrane process designers must consider a set of parameters and identify the best-operating conditions through optimization in the design of 80 membrane gas processing units [146]. To promote membrane technology for large-scale uses in the short term and fully exploit the use of a membrane in helium recovery and upgrading, the development of more selective, higher-flux and cost-effective membranes are still critical concerns.…”

Section: High Compressors or Vacuum Pump Costmentioning

confidence: 99%

Design and techno-economic evaluation of multi-stage membrane processes for helium recovery from natural gas

Quader¹

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Helium (He) is a non-renewable resource, the second most abundant element, and a valuable commodity due to its unique physical and chemical properties. Most industrial He is recovered from a limited number of natural gas (NG) reservoirs containing low concentrations of He by cryogenic distillation of the off-gases from nitrogen rejection units (NRU) in liquefied NG (LNG) plants. The conventional processes for He recovery Publications included in this thesis M. Abdul Quader, Thomas E. Rufford, and Simon Smart, "Modeling and cost analysis of helium recovery using combined-membrane process configurations", Separation and Purification Technology, 2020, Volume 236, Pages 116269.incorporated as Chapter 4. Contributors Statement of contribution M. Abdul Quader (Candidate) Concept and design (75%) Analysis and interpretation of data (75%) Drafting and writing (75%) Thomas E. Rufford Concept and design (10%) Analysis and interpretation of data (10%) Drafting and writing (10%) Simon Smart Concept and design (15%) Analysis and interpretation of data (15%)

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The optimal point within the Robeson upper boundary

Cited by 17 publications

References 29 publications

Confined Ionic Liquid in an Ionic Porous Aromatic Framework for Gas Separation

Confined Ionic Liquid in an Ionic Porous Aromatic Framework for Gas Separation

Integrated Experimental–Technoeconomic Analysis of the Lifetime of Pd–Au Membranes

Design and techno-economic evaluation of multi-stage membrane processes for helium recovery from natural gas

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