Special Issue "Ionic Liquid and Polymerized Ionic Liquids as Membranes for Clean Energy Generation and Industrial Gas Separations"

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Applications in Industry and Chemical Analysis".

Deadline for manuscript submissions: 30 May 2019

Special Issue Editor

Guest Editor
Prof. Dr. Jason E. Bara

Department of Chemical and Biological Engineering, University of Alabama, Tuscaloosa, AL 35487-0203, USA
Website | E-Mail
Interests: ionic liquids, high-performance polymers, gas separations, CO2 capture, membranes, green chemistry, simulations and modeling, big data

Special Issue Information

Dear Colleagues,

Ionic liquids (ILs) and polymer forms of ILs have emerged as highly tuneable and versatile materials for the design of advanced gas separation membranes for CO2 capture and other important gas separations in energy generation. The use of ILs in gas separation membranes originally took the form of supported liquid membranes (SLMs), which had high permeability and good selectivity for CO2/N2 and CO2/CH4 separation, but suffered an inability to withstand much of a pressure differential across the membrane. Poly(IL) materials and block copolymers were thus developed as a means of stabilizing ILs within a polymer matrix, resulting in greatly improved mechanical properties with some reduction in permeability while retaining good selectivity. ILs have also been used in combination with inorganic materials as mixed matrix membranes. There has been recent interest in combining ILs and high-performance polymers such as polyimides in order to overcome the limitations of early poly(IL) membranes.

This Special Issue of Membranes will focus on recent progress in the design of membranes based on ILs and poly(ILs) as well as other materials based on, or containing, ILs within their structure. Original research articles, communications and reviews are invited.

Prof. Dr. Jason E. Bara
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Ionic liquid
  • Poly(ionic liquid)
  • Ionene
  • Ionomer
  • Carbon capture
  • Natural gas treating
  • Hydrogen separation
  • Composites
  • Nanostructured materials
  • Membranes
  • Polymer
  • Mixed matrix
  • Inorganic
  • Organic
  • Hybrid materials

Published Papers (3 papers)

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Research

Open AccessFeature PaperArticle Separation of Carbon Dioxide from Real Power Plant Flue Gases by Gas Permeation Using a Supported Ionic Liquid Membrane: An Investigation of Membrane Stability
Received: 3 January 2019 / Revised: 13 February 2019 / Accepted: 15 February 2019 / Published: 4 March 2019
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Abstract
The separation of carbon dioxide from coal-fired power plant flue gases using a CO2/N2-selective supported ionic liquid membrane (SILM) was investigated and the performance and stability of the membrane during operation are reported. The membrane is composed of a [...] Read more.
The separation of carbon dioxide from coal-fired power plant flue gases using a CO2/N2-selective supported ionic liquid membrane (SILM) was investigated and the performance and stability of the membrane during operation are reported. The membrane is composed of a polyacrylonitrile (PAN) ultrafiltration membrane as a support and a selective layer of an ionic liquid (IL), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM Tf2N). The feasibility of large-scale SILM production was demonstrated by the formation of a square-meter-scale membrane and preparation of a membrane module. A flat-sheet envelope-type SILM module containing 0.67 m2 of the membrane was assembled. Prior to real flue gas operation, the separation behaviour of the membrane was investigated with single gases. The stability of the SILM during the test stand and pilot plant operation using real power plant flue gases is reported. The volume fraction of carbon dioxide in the flue gas was raised from approx. 14 vol. % (feed) to 40 vol. % (permeate). However, issues concerning the membrane stability were found when SO3 aerosols in large quantities were present in the flue gas. Full article
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Open AccessArticle Acidic Gases Separation from Gas Mixtures on the Supported Ionic Liquid Membranes Providing the Facilitated and Solution-Diffusion Transport Mechanisms
Received: 12 November 2018 / Revised: 4 January 2019 / Accepted: 5 January 2019 / Published: 5 January 2019
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Abstract
Nowadays, the imidazolium-based ionic liquids containing acetate counter-ions are attracting much attention as both highly selective absorbents of the acidic gases and CO2 carriers in the supported ionic liquid membranes. In this regard, the investigation of the gas transport properties of such [...] Read more.
Nowadays, the imidazolium-based ionic liquids containing acetate counter-ions are attracting much attention as both highly selective absorbents of the acidic gases and CO2 carriers in the supported ionic liquid membranes. In this regard, the investigation of the gas transport properties of such membranes may be appropriate for better understanding of various factors affecting the separation performance and the selection of the optimal operating conditions. In this work, we have tested CH4, CO2 and H2S permeability across the supported ionic liquid membranes impregnated by 1-butyl-3-methylimidazolium acetate (bmim[OAc]) with the following determination of the ideal selectivity in order to compare the facilitated transport membrane performance with the supported ionic liquid membrane (SILM) that provides solution-diffusion mechanism, namely, containing 1-butyl-3-methylimidazolium tetrafluoroborate (bmim[BF4]). Both SILMs have showed modest individual gases permeability and ideal selectivity of CO2/CH4 and H2S/CH4 separation that achieves values up to 15 and 32, respectively. The effect of the feed gas mixture composition on the permeability of acidic gases and permeselectivity of the gas pair was investigated. It turned out that the permeation behavior for the bmim[OAc]-based SILM toward the binary CO2/CH4, H2S/CH4 and ternary CO2/H2S/CH4 mixtures was featured with high acidic gases selectivity due to the relatively low methane penetration through the liquid phase saturated by acidic gases. Full article
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Open AccessArticle Towards Biohydrogen Separation Using Poly(Ionic Liquid)/Ionic Liquid Composite Membranes
Membranes 2018, 8(4), 124; https://doi.org/10.3390/membranes8040124
Received: 19 October 2018 / Revised: 28 November 2018 / Accepted: 28 November 2018 / Published: 2 December 2018
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Abstract
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 [...] Read more.
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. Full article
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