Predictive models for permeability and diffusivity of CH4 through imidazolium-based supported ionic liquid membranes

Solubility and diffusivity of H2 and CO2 in the ionic liquid [bmim][PF6]

“…For CO 2 , A CO 2 ¼ 0.64 and E CO 2 ¼ 32. Similar functional dependence on temperature has been reported for the diffusivity of carbon dioxide and methane in a number of ILs[14,15,30]. Using a gravimetric method for CO 2 diffusivity in the same IL, Shiflett et al[30] reported E CO 2 ¼ 27.2 (kJ/mol), which is consistent (but 15% less) with the value obtained in our work.The Arrhenius-like dependence of the H 2 and CO 2 diffusivities in [bmim][PF…”

“…Nevertheless, the accuracy of the isochoric and the supported IL-based membrane techniques decrease considerably when one deals with low-solubility gases, such as hydrogen. This is mostly due to the inherent susceptibility of the two methods to gas leaks and temperature fluctuations [14,15].…”

Playing with ionic liquid mixtures to design engineered CO2separation membranes

“…This general trend when scaling the gas permeability with IL viscosity has been recognized by different authors. 13,49,59,66,68,82 However, when analyzing the results obtained for the ILs containing -CN groups, the CO 2 permeabilities are found to greatly increase (from 263 to 742 Barrer) with the increasing number of cyano groups 1). This is clear evidence that the description of gas permeability simply in terms of IL viscosity does not provide a full understanding of SILMs based on the cyano-functionalized anions.…”

Carbon capture with ionic liquids: overview and progress

“…Analyzing these publications, the research interests have been addressed as the following aspects: 1) the design and synthesis of new ionic liquids, especially the task-specific ionic liquids with enhanced absorption performance by functionalization with an amine or other groups; 10,20,24,25 2) the modifications of ionic liquids by synthesizing supported ionic liquids membrane materials (SILMs) which have advantages to tune the physical/ chemical properties for specific applications, and preparing polymerized ionic liquids, as well as blending with other solvents like water, amines. [26][27][28][29][30][31][32] The aim of the modification is to improve the CO 2 capacity and selectivity, and reduce viscosity and the resistance of gas mass transfer in solvents according to industrial applications; 3) the measurement and estimation of the physical/ chemical properties of the multi-component systems containing ionic liquids, CO 2 and other compounds, and development of suitable thermodynamic models; 33-36 4) the studies on the transport properties, absorption kinetics and the process design of CO 2 capture with ionic liquids considering real industrial gases, as well as assessments and comparisons of energy consumption and economic performance of ionic liquids processes; 10,17,20,24,37-39 5) the environmental impact, toxicity and risk assessment of ionic liquids are receiving more and more interest [40][41][42][43] due to growing severe legislations and restrictions, and also the awareness of environmentally conscious process design. But the specific work with direct regard to ionic liquids processeses for CO 2 capture is still few.…”