CO2/N2 separation using supported ionic liquid membranes with green and cost-effective [Choline][Pro]/PEG200 mixtures |
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Authors: | Tengteng Fan Wenlong Xie Xiaoyan Ji Chang Liu Xin Feng Xiaohua Lu |
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Affiliation: | 1.College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;2.Division of Energy Science/Energy Engineering, Luleå University of Technology, 97187 Luleå, Sweden |
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Abstract: | The high price and toxicity of ionic liquids (ILs) have limited the design and application of supported ionic liquid membranes (SILMs) for CO2 separation in both academic and industrial fields. In this work, [Choline][Pro]/poly-ethylene glycol 200 (PEG200) mixtures were selected to prepare novel SILMs because of their green and cost-effective characterization, and the CO2/N2 separation with the prepared SILMs was investigated experimental y at temperatures from 308.15 to 343.15 K. The temperature effect on the permeability, solubility and diffusivity of CO2 was modeled with the Arrhenius equation. A competitive performance of the prepared SILMs was ob-served with high CO2 permeability ranged in 343.3-1798.6 barrer and high CO2/N2 selectivity from 7.9 to 34.8. It was also found that the CO2 permeability increased 3 times by decreasing the viscosity of liquids from 370 to 38 mPa·s. In addition, the inherent mechanism behind the significant permeability enhancement was revealed based on the diffusion-reaction theory, i.e. with the addition of PEG200, the overall resistance was substantial y decreased and the SILMs process was switched from diffusion-control to reaction-control. |
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Keywords: | CO2/N2 separation Supported ionic liquid membranes (SILMs) [Choline][Pro]/PEG200 Diffusion-reaction theory |
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