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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：JOURNAL OF MEMBRANE SCIENCE

收录刊物：SCIE、EI

卷号：545

页面范围：176-184

ISSN号：0376-7388

关键字：gamma-Al2O3 membrane; Supported ionic liquid membranes; Carbon dioxide capture; Hot coating; Controllable preparation

摘要：Supported ionic liquid membranes (SILMs) prepared with inorganic supports are more stable under high temperatures and differential pressures for gas separation than those based on organic membranes. In this study, a hot coating method was used to modify commercial alpha-Al2O3 tubular substrates to prepare high-quality membrane supports. Following impregnation of an ionic liquid (IL; [BMIM][BF4] or [BMIM][Ac]) into the supports over a short time, the as-prepared SILMs were used for separation of N-2 and CO2. The effects of preparation parameters, including impregnation time (0-1800 s) and impregnation temperature (18-59 degrees C) on SILM performance and IL loading were systematically investigated to gain a better understanding of the SILM preparation process. The optimum impregnation time was determined by considering both the permeance and the selectivity. Further, a high temperature was found to be beneficial for the preparation process because the viscosity of ILs is usually low at higher temperatures. However, when the viscosities of the two ILs ([BMIM][BF4] and [BMIM] [Ac]) were maintained at the same value by controlling the impregnation temperature, the qualities of the as-prepared SILMs were different, which may be due to the different surface tensions of these ILs.