{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T01:51:22Z","timestamp":1792547482741,"version":"4.5.0"},"reference-count":59,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T00:00:00Z","timestamp":1776038400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["23-79-10288"],"award-info":[{"award-number":["23-79-10288"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]},{"award":["23-79-10288"],"award-info":[{"award-number":["23-79-10288"]}],"id":[{"id":"https:\/\/ror.org\/03y2gwe85","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Polyetherimide (Ultem-1000) hollow-fiber membranes were developed for biogas purification with emphasis on the relationship between spinning conditions, membrane morphology, gas transport properties, and module performance. Hollow fibers were prepared from dope solutions based on dimethylformamide (DMF) and N-methyl-2-pyrrolidone (NMP) at different conditions, followed by post-treatment with 1 and 3 wt.% silicone solution in n-heptane to reduce nonselective defects and improve selectivity toward the intrinsic behavior of dense PEI films. SEM analysis revealed that DMF-based fibers formed a more open, macrovoid-rich structure, whereas NMP-based fibers exhibited a more homogeneous sponge-like morphology with a better-defined selective layer. DMF-based fibers experienced faster demixing, which promoted macrovoid formation, increased pore connectivity of the substructure, lowered mass transfer resistance, and at the same time increased the probability of nonselective pathways and defect-related loss of selectivity. This structural evolution was reflected in gas transport properties: untreated DMF fibers showed high mixed-gas permeance but limited selectivity, while NMP fibers demonstrated lower permeance and selectivity values closer to those of the dense film. Silicone post-treatment significantly improved separation performance, with 3 wt.% coating being markedly more effective than 1 wt.% coating. The best compromise between permeance and selectivity was achieved for the DMF-based fibers treated with 3 wt.% silicone, which exhibited CO2 and H2S permeances of 39.4 and 47.12 GPU, respectively, together with selectivity values of 22.4, 26.8 and 20.2 for CO2\/CH4, H2S\/CH4 and CO2\/N2. A membrane module containing 500 fibers was studied during the quasi-real biogas upgrading. With increasing stage-cut, the CH4 concentration in the retentate increased from ~74 to 96 mol.%, while CO2 decreased from ~21 to 2 mol.%. The results demonstrate that structure control combined with silicone post-treatment is an effective strategy for producing PEI hollow fibers suitable for simultaneous methane enrichment and removal of acid impurities from biogas.<\/jats:p>","DOI":"10.3390\/polym18080951","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T13:12:26Z","timestamp":1776085946000},"page":"951","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Structure-Controlled Polyetherimide Hollow Fibers for Biogas Purification"],"prefix":"10.3390","volume":"18","author":[{"given":"Pavel","family":"\u021aiuleanu","sequence":"first","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Artem A.","family":"Atlaskin","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirill A.","family":"Smorodin","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergey S.","family":"Kryuchkov","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria E.","family":"Atlaskina","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4904-7622","authenticated-orcid":false,"given":"Anton N.","family":"Petukhov","sequence":"additional","affiliation":[{"name":"Chemical Engineering Laboratory, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5447-5296","authenticated-orcid":false,"given":"Andrey V.","family":"Vorotyntsev","sequence":"additional","affiliation":[{"name":"Chemical Engineering Laboratory, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8566-708X","authenticated-orcid":false,"given":"Nikita S.","family":"Tsivkovsky","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7923-1795","authenticated-orcid":false,"given":"Alexander A.","family":"Sysoev","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ilya V.","family":"Vorotyntsev","sequence":"additional","affiliation":[{"name":"Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"468","DOI":"10.1016\/S1876-3804(22)60040-5","article-title":"Earth Energy Evolution, Human Development and Carbon Neutral Strategy","volume":"49","author":"Zou","year":"2022","journal-title":"Pet. Explor. Dev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"128482","DOI":"10.1016\/j.jhazmat.2022.128482","article-title":"The Role of Chemotaxis in Natural Source Zone Depletion at a Legacy Petroleum Hydrocarbon Site","volume":"430","author":"Murphy","year":"2022","journal-title":"J. Hazard. Mater."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1016\/j.gr.2021.10.018","article-title":"Hydrocarbon Accumulation Depth Limit and Implications for Potential Resources Prediction","volume":"103","author":"Pang","year":"2022","journal-title":"Gondwana Res."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"129174","DOI":"10.1016\/j.energy.2023.129174","article-title":"Winner or Loser? The Bidirectional Impact between Geopolitical Risk and Energy Transition from the Renewable Energy Perspective","volume":"283","author":"Liu","year":"2023","journal-title":"Energy"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"2164","DOI":"10.1007\/s10668-021-01524-8","article-title":"A Multi-Perspective Assessment Approach of Renewable Energy Production: Policy Perspective Analysis","volume":"24","author":"Baloch","year":"2021","journal-title":"Environ. Dev. Sustain."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"120053","DOI":"10.1016\/j.renene.2024.120053","article-title":"Assessing and Prioritizing Biogas Energy Barriers: A Sustainable Roadmap for Energy Security","volume":"223","author":"Feng","year":"2024","journal-title":"Renew. Energy"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"8750221","DOI":"10.1155\/2022\/8750221","article-title":"Biogas Production and Applications in the Sustainable Energy Transition","volume":"2022","author":"Kabeyi","year":"2022","journal-title":"J. Energy"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"101432","DOI":"10.1016\/j.biteb.2023.101432","article-title":"Estimation of Renewable Biogas Energy Potential from Livestock Manure: A Case Study of India","volume":"22","author":"Nehra","year":"2023","journal-title":"Bioresour. Technol. Rep."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"108762","DOI":"10.1016\/j.biombioe.2025.108762","article-title":"A Comprehensive Analysis of a 250 KW Biogas Energy Plant from Energy, Exergy, Environmental and Economical (4E) Perspectives: Kastamonu Case Study","volume":"207","author":"Akbulut","year":"2026","journal-title":"Biomass Bioenergy"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"775","DOI":"10.1016\/j.matpr.2022.09.015","article-title":"A Review on Biogas Upgradation Systems","volume":"72","author":"Karne","year":"2023","journal-title":"Mater. Today Proc."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"124195","DOI":"10.1016\/j.energy.2022.124195","article-title":"Biogas Upgrading with Various Single and Blended Amines Solutions: Capacities and Kinetics","volume":"253","author":"Han","year":"2022","journal-title":"Energy"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"9565","DOI":"10.1007\/s13399-021-01750-0","article-title":"Advances in Biogas Cleaning, Enrichment, and Utilization Technologies: A Way Forward","volume":"13","author":"Katariya","year":"2023","journal-title":"Biomass Convers. Biorefin."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Mouleeshuwarapprabu, R., Mrunalini, T., Surya, K., Sathyanandhan, K., Sri Priyangka, S.P., and Chinnasamy, R. (2023, January 14\u201315). Design And Development Of Biogas Purifier. Proceedings of the 2023 International Conference on Energy, Materials and Communication Engineering, ICEMCE, Madurai, India.","DOI":"10.1109\/ICEMCE57940.2023.10433973"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"e202400779","DOI":"10.1002\/cssc.202400779","article-title":"A Comprehensive Review on Biomethane Production from Biogas Separation and Its Techno-Economic Assessments","volume":"17","author":"Swinbourn","year":"2024","journal-title":"ChemSusChem"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"33680","DOI":"10.1021\/acsomega.2c03514","article-title":"A Review on Carbon Dioxide Minimization in Biogas Upgradation Technology by Chemical Absorption Processes","volume":"7","author":"Muntaha","year":"2022","journal-title":"ACS Omega"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Gholizadeh, T., Ghiasirad, H., and Skorek-Osikowska, A. (2024). Sustainable Biomethanol and Biomethane Production via Anaerobic Digestion, Oxy-Fuel Gas Turbine and Amine Scrubbing CO2 Capture. Energies, 17.","DOI":"10.3390\/en17184703"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2915","DOI":"10.1016\/j.matpr.2022.08.003","article-title":"Methane Enrichment for Biogas Purification Using Pressure Swing Adsorption Techniques","volume":"72","author":"Mergenthal","year":"2023","journal-title":"Mater. Today Proc."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"118268","DOI":"10.1016\/j.enconman.2024.118268","article-title":"An Overview of Biogas Upgrading via Pressure Swing Adsorption: Navigating through Bibliometric Insights towards a Conceptual Framework and Future Research Pathways","volume":"306","author":"Helwani","year":"2024","journal-title":"Energy Convers. Manag."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"285","DOI":"10.1016\/j.cherd.2022.05.012","article-title":"Carbon Dioxide Removal from Biogas through Pressure Swing Adsorption\u2013A Review","volume":"183","author":"Bahrun","year":"2022","journal-title":"Chem. Eng. Res. Des."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"119380","DOI":"10.1016\/j.ces.2023.119380","article-title":"Energy-Efficient Regeneration of Amine-Based Solvent with Environmentally Friendly Ionic Liquid Catalysts for CO2 Capture","volume":"283","author":"Sun","year":"2024","journal-title":"Chem. Eng. Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"126903","DOI":"10.1016\/j.energy.2023.126903","article-title":"Analysis of the Energy Consumption in Solvent Regeneration Processes Using Binary Amine Blends for CO2 Capture","volume":"270","author":"He","year":"2023","journal-title":"Energy"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"109078","DOI":"10.1016\/j.biombioe.2026.109078","article-title":"Biogas Upgrading Technologies with Emphasis on Membrane Separation Performance","volume":"210","author":"Ahmad","year":"2026","journal-title":"Biomass Bioenergy"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1016\/j.coche.2012.02.004","article-title":"Thermal Degradation of Amines for CO2 Capture","volume":"1","author":"Rochelle","year":"2012","journal-title":"Curr. Opin. Chem. Eng."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"771","DOI":"10.1016\/j.egypro.2009.01.102","article-title":"Oxidative Degradation Mechanisms for Amines in Flue Gas Capture","volume":"1","author":"Bedell","year":"2009","journal-title":"Energy Procedia"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/j.egypro.2011.01.038","article-title":"Oxidation of Amines at Absorber Conditions for CO2 Capture from Flue Gas","volume":"4","author":"Voice","year":"2011","journal-title":"Energy Procedia"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1534","DOI":"10.1016\/j.egypro.2011.02.022","article-title":"Corrosion and Degradation Performance of Novel Absorbent for CO2 Capture in Pilot-Scale","volume":"4","author":"Gao","year":"2011","journal-title":"Energy Procedia"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1134\/S0965544111080111","article-title":"Deep Gas Cleaning of Highly Permeating Impurities Using a Membrane Module with a Feed Tank","volume":"51","author":"Vorotyntsev","year":"2011","journal-title":"Pet. Chem."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"205026","DOI":"10.1016\/j.jgsce.2023.205026","article-title":"Separation of CH4-CO2 Gas Mixture by Gas Hydrate Crystallisation: A Parametric Study","volume":"116","author":"Kudryavtseva","year":"2023","journal-title":"Gas Sci. Eng."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"108104","DOI":"10.1016\/j.jece.2022.108104","article-title":"CO2 Capture Process through Hybrid Gas Hydrate-Membrane Technology: Complex Approach for the Transition from Theory to Practice","volume":"10","author":"Petukhov","year":"2022","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Aguilloso, G., Arpia, K., Khan, M., Sapico, Z.A., and Lopez, E.C.R. (2024). Recent Advances in Membrane Technologies for Biogas Upgrading. Eng. Proc., 67.","DOI":"10.3390\/engproc2024067057"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"777","DOI":"10.1016\/j.renene.2022.09.124","article-title":"Renewable Biomethane Production from Biogas Upgrading via Membrane Separation: Experimental Analysis and Multistep Configuration Design","volume":"200","author":"Zito","year":"2022","journal-title":"Renew. Energy"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2020","DOI":"10.1134\/S0036024406120259","article-title":"Sorption of Ammonia and Nitrogen on Cellulose Acetate","volume":"80","author":"Vorotyntsev","year":"2006","journal-title":"Russ. J. Phys. Chem."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"115858","DOI":"10.1016\/j.seppur.2019.115858","article-title":"High-Pressure CO2\/CH4 Separation of Zr-MOFs Based Mixed Matrix Membranes","volume":"230","author":"Ahmad","year":"2020","journal-title":"Sep. Purif. Technol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1016\/j.seppur.2015.04.017","article-title":"Mixed Matrix Membranes Using SAPO-34\/Polyetherimide for Carbon Dioxide\/Methane Separation","volume":"148","author":"Takagaki","year":"2015","journal-title":"Sep. Purif. Technol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1016\/j.memsci.2015.08.006","article-title":"Polyimide Mixed Matrix Membranes for CO2 Separations Using Carbon\u2013Silica Nanocomposite Fillers","volume":"495","author":"Didden","year":"2015","journal-title":"J. Memb. Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"118562","DOI":"10.1016\/j.jece.2025.118562","article-title":"Alkyl-Methylimidazolium Tricyanomethanide-Based Supported Ionic Liquid Membranes for CO2 Separation from Flue Gas and Biogas","volume":"13","author":"Choleva","year":"2025","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_37","first-page":"100572","article-title":"Effect of Cation\u2019s Alkyl Chain Length of Imidazolium-Driven PVDF-Based Supported Ionic Liquid Membranes on the CO2 Separation Performance from Biogas and Flue Gas","volume":"16","author":"Izquierdo","year":"2026","journal-title":"Carbon Capture Sci. Technol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1016\/j.seppur.2015.08.022","article-title":"Effective Permeability of Binary Mixture of Carbon Dioxide and Methane and Pre-Dried Raw Biogas in Supported Ionic Liquid Membranes","volume":"153","author":"Friess","year":"2015","journal-title":"Sep. Purif. Technol."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"117733","DOI":"10.1016\/j.memsci.2019.117733","article-title":"Amino-Functionalized POSS Nanocage Intercalated Graphene Oxide Membranes for Efficient Biogas Upgrading","volume":"596","author":"Yang","year":"2020","journal-title":"J. Memb. Sci."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"121147","DOI":"10.1016\/j.carbon.2025.121147","article-title":"Enhancing the CO2\/CH4 Gas Separation Performance of Graphene Membranes via Oxygen Functionalization","volume":"248","author":"Hasumi","year":"2026","journal-title":"Carbon"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"4638","DOI":"10.1021\/ie8019032","article-title":"Membrane Gas Separation: A Review\/State of the Art","volume":"48","author":"Bernardo","year":"2009","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1016\/j.cej.2006.08.009","article-title":"Design of an Integrated Membrane System for a High Level Hydrogen Purification","volume":"124","author":"Chiappetta","year":"2006","journal-title":"Chem. Eng. J."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"122309","DOI":"10.1016\/j.seppur.2022.122309","article-title":"Investigation of Membrane Wetting for CO2 Capture by Gas\u2013Liquid Contactor Based on Ceramic Membrane","volume":"304","author":"Xue","year":"2023","journal-title":"Sep. Purif. Technol."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Peck, D., Zappi, M., Gang, D., Guillory, J., Hernandez, R., and Buchireddy, P. (2023). Review of Porous Ceramics for Hot Gas Cleanup of Biomass Syngas Using Catalytic Ceramic Filters to Produce Green Hydrogen\/Fuels\/Chemicals. Energies, 16.","DOI":"10.3390\/en16052334"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"2103814","DOI":"10.1002\/advs.202103814","article-title":"2D Polymer Nanosheets for Membrane Separation","volume":"9","author":"Wang","year":"2022","journal-title":"Adv. Sci."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"120712","DOI":"10.1016\/j.memsci.2022.120712","article-title":"A Novel IL\/MOF\/Polymer Mixed Matrix Membrane Having Superior CO2\/N2 Selectivity","volume":"658","author":"Habib","year":"2022","journal-title":"J. Memb. Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"400","DOI":"10.1016\/j.ijhydene.2023.06.103","article-title":"Engineered Pinhole-Stitching Process of PEI-Based Hollow Fiber Membrane Enables Preferred Performance toward Light Gas Separation","volume":"50","author":"Lin","year":"2024","journal-title":"Int. J. Hydrog. Energy"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"3556","DOI":"10.1039\/C7RA12045A","article-title":"Polyetherimide Hollow Fiber Membranes for CO2 Absorption and Stripping in Membrane Contactor Application","volume":"8","author":"Naim","year":"2018","journal-title":"RSC Adv."},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Li, G., Kujawski, W., Knozowska, K., and Kujawa, J. (2021). The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS\/PEI Hollow Fiber Membranes for CO2\/N2 Separation. Membranes, 11.","DOI":"10.3390\/membranes11010056"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/S0376-7388(97)00229-9","article-title":"Preparation and Characterization of Polyetherimide Asymmetric Hollow Fiber Membranes for Gas Separation","volume":"138","author":"Wang","year":"1998","journal-title":"J. Memb. Sci."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"\u021aiuleanu, P., Atlaskin, A.A., Smorodin, K.A., Kryuchkov, S.S., Atlaskina, M.E., Petukhov, A.N., Vorotyntsev, A.V., Tsivkovskiy, N.S., Sysoev, A.A., and Vorotyntsev, I.V. (2025). The Production of High-Permeable and Macrovoid-Free Polysulfone Hollow Fiber Membranes and Their Utilization in CO2 Capture Applications via the Membrane-Assisted Gas Absorption Technique. Polymers, 17.","DOI":"10.3390\/polym17101407"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"1218","DOI":"10.14716\/ijtech.v15i5.6987","article-title":"Membrane Air Separation Process Simulation: Insight in Modelling Approach Based on Ideal and Mixed Permeance Values","volume":"15","author":"Kryuchkov","year":"2024","journal-title":"Int. J. Technol."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"628","DOI":"10.1039\/tf9393500628","article-title":"Permeation, Diffusion and Solution of Gases in Organic Polymers","volume":"35","author":"Barrer","year":"1939","journal-title":"Trans. Faraday Soc."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1002\/pol.1958.1202711515","article-title":"Sorption and Diffusion in Ethyl Cellulose. Part III. Comparison between Ethyl Cellulose and Rubber","volume":"27","author":"Barrer","year":"1958","journal-title":"J. Polym. Sci."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.memsci.2018.04.029","article-title":"A Novel Time Lag Method for the Analysis of Mixed Gas Diffusion in Polymeric Membranes by On-Line Mass Spectrometry: Method Development and Validation","volume":"561","author":"Fraga","year":"2018","journal-title":"J. Memb. Sci."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1023\/A:1022310222267","article-title":"Determination of Trace Impurities of H2, O2, Ar, N2, CO, CO2, and Hydrocarbons in High-Purity Monosilane by Gas Chromatography","volume":"58","author":"Vorotyntsev","year":"2003","journal-title":"J. Anal. Chem."},{"key":"ref_57","doi-asserted-by":"crossref","unstructured":"Zid, S., Alcouffe, P., Zinet, M., and Espuche, E. (2022). Mixed-Matrix Membranes Based on Polyetherimide, Metal\u2013Organic Framework and Ionic Liquid: Influence of the Composition and Morphology on Gas Transport Properties. Polymers, 14.","DOI":"10.3390\/polym14173489"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"419","DOI":"10.1016\/S0376-7388(02)00286-7","article-title":"Preparation of Asymmetric Polyetherimide Hollow Fibre Membrane with High Gas Selectivities","volume":"208","author":"Wang","year":"2002","journal-title":"J. Memb. Sci."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"120454","DOI":"10.1016\/j.memsci.2022.120454","article-title":"Multi-Step Membrane Process for Biogas Upgrading","volume":"652","author":"Zito","year":"2022","journal-title":"J. Memb. 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