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        Stabilization of [BMIM][PF6] ionic liquid membrane in structurally optimized multilayer ceramic support through aqueous DEA solution for CO2/CH4 separation

        Hamid Reza Mahdavi,Mehran Arzani,Hamed Faramarzi,Omid Bakhtiari,Toraj Mohammadi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

        The stability of the ceramic supported liquid membranes (SLMs) is one of the most interesting researchsubjects. In this work, the SLMs’ stability for CO2/CH4 separation was investigated. Following pressing a-Al2O3 substrates at 400, 600, and 800 bar, colloidal and polymeric TiO2 intermediate and top layers werecoated. Aqueous diethanolamine (DEA) solution was used as solvent in the SLM to optimize supportstructure based on CO2/CH4 separation performance. The pressed support at 800 bar and coated withTiO2 demonstrated best performance and selected for further study. Subsequently, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) ionic liquid (IL) was immobilized inside theselected support and used as the supported ionic liquid membrane (SILM) for CO2/CH4 separation. TheSILM separation performance was evaluated under different pressures and temperatures. Temperaturewas found to has greater effect than pressure due to a decrease in IL’s viscosity and an increase in penetrantdiffusivity. At 25 C and 1 bar, SILM exhibited consistent and reliable performance as CO2 and CH4permeabilities of 244.0 and 7.4 Barrer, respectively, and CO2/CH4 selectivity of 33.0 over 6 h. The findingscontribute to understanding the implementation of multilayer ceramic SILMs for CO2/CH4 separation andhighlight its potential along with opening up new avenues.

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