Abstract
Industrial application of novel, green and effective liquid absorbents for improving the separation yield of CO2 greenhouse pollutant is an important milestone to reduce its emission to the atmosphere. In this research, the separation performance of three novel and green ionic liquids (ILs) including [bmim][PF6], [bmim][BF4] and [emim][etSO4] are compared with pure water to evaluate the feasibility of their employment to enhance the removal potency of CO2 through the membrane contactor. With the aim of reaching this goal, a finite element-based model and a numerical simulation are developed to solve the momentum/mass transfer equations and predict the results. Based on the modeling/simulation outcomes, the addition of the abovementioned ILs could substantially increase the separation of CO2 molecules compared to pure water. Based on the results, [bmim][BF4] is introduced as the most efficient IL with the separation efficiency of 100 % (100 % [bmim][BF4]> 99 % [bmim][PF6]> 97.5 % [emim][etSO4]> 55 % pure water). Furthermore, the effects of different operational/functional parameters (i.e., gas flow rate, porosity, fibers’ number and packing density) on the CO2 separation efficacy is comprehensively discussed.
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