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Experimental Mixed-Gas Permeability, Sorption and Diffusion of CO2-CH4 Mixtures in 6FDA-mPDA Polyimide Membrane: Unveiling the Effect of Competitive Sorption on Permeability Selectivity

التفاصيل البيبلوغرافية
العنوان: Experimental Mixed-Gas Permeability, Sorption and Diffusion of CO2-CH4 Mixtures in 6FDA-mPDA Polyimide Membrane: Unveiling the Effect of Competitive Sorption on Permeability Selectivity
المؤلفون: Giuseppe Genduso, Bader S. Ghanem, Ingo Pinnau
المصدر: Membranes, Vol 9, Iss 1, p 10 (2019)
بيانات النشر: MDPI AG, 2019.
سنة النشر: 2019
المجموعة: LCC:Chemical technology
LCC:Chemical engineering
مصطلحات موضوعية: mixed-gas sorption, mixed-gas diffusion, mixed-gas permeation, competitive sorption, gas separation membranes, 6FDA-mPDA polyimide, Chemical technology, TP1-1185, Chemical engineering, TP155-156
الوصف: The nonideal behavior of polymeric membranes during separation of gas mixtures can be quantified via the solution-diffusion theory from experimental mixed-gas solubility and permeability coefficients. In this study, CO2-CH4 mixtures were sorbed at 35 °C in 4,4′-(hexafluoroisopropylidene)diphthalic dianhydride (6FDA)-m-phenylenediamine (mPDA)—a polyimide of remarkable performance. The existence of a linear trend for all data of mixed-gas CO2 versus CH4 solubility coefficients—regardless of mixture concentration—was observed for 6FDA-mPDA and other polymeric films; the slope of this trend was identified as the ratio of gas solubilities at infinite dilution. The CO2/CH4 mixed-gas solubility selectivity of 6FDA-mPDA and previously reported polymers was higher than the equimolar pure-gas value and increased with pressure from the infinite dilution value. The analysis of CO2-CH4 mixed-gas concentration-averaged effective diffusion coefficients of equimolar feeds showed that CO2 diffusivity was not affected by CH4. Our data indicate that the decrease of CO2/CH4 mixed-gas diffusion, and permeability selectivity from the pure-gas values, resulted from an increase in the methane diffusion coefficient in mixtures. This effect was the result of an alteration of the size sieving properties of 6FDA-mPDA as a consequence of CO2 presence in the 6FDA-mPDA film matrix.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2077-0375
Relation: http://www.mdpi.com/2077-0375/9/1/10; https://doaj.org/toc/2077-0375
DOI: 10.3390/membranes9010010
URL الوصول: https://doaj.org/article/9a7709a9c8b24c8d86a3a09e9d13cca2
رقم الأكسشن: edsdoj.9a7709a9c8b24c8d86a3a09e9d13cca2
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:20770375
DOI:10.3390/membranes9010010