Preparation of Supported Ionic Liquid Membranes Using a Supercritical Fluid Deposition Method and Study of the Capillary Phase Transition of Ionic Liquids in Supercritical CO2
| Autor: | Yi-Fan Liu, Hong-Yue Zhu, Jian-Zhong Yin, Qin-Qin Xu, Yu-Qing Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Phase transition
Materials science Capillary action General Chemical Engineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Supercritical fluid Surface tension chemistry.chemical_compound Membrane 020401 chemical engineering chemistry Chemical engineering Ionic liquid Deposition (phase transition) 0204 chemical engineering 0210 nano-technology Selectivity |
| Zdroj: | Industrial & Engineering Chemistry Research. 58:19189-19196 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | Supported ionic liquid membranes (SILMs) based on [EMIM][Ac] and γ-Al2O3 membranes were prepared using a supercritical fluid deposition (SCFD) method at 12 MPa and 50 °C. The influences of the preparation time, ionic liquid loading, and ethanol content on the performance of SILMs were studied. The CO2/N2 selectivity of the as-prepared SILMs reached the ideal selectivity of [EMIM][Ac]. When the ionic liquid (IL) was dissolved in a mixture of supercritical CO2 (scCO2) and ethanol, the IL easily diffused into the small pores in supports. Moreover, the dissolved IL could transition to the liquid phase in the small pores because of the capillary phase transition, leading to the selective filling of the meso- and micropores in the supports. The surface tension of the liquid phase and the ratio of the IL concentration to the saturation IL concentration were found to be the key factors influencing the capillary phase transition of the IL. |
| Databáze: | OpenAIRE |
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