| 摘要: |
| 离子液体（ILs）-CO2作为一种新型吸收制冷工质对，ILs种类的选择对其工质对性能及吸收式制冷循环特性至关重要。ILs对CO2的吸收性能与ILs种类、阳离子结构、体系温度及CO2分压有直接关系。本文建立了一套ILs吸收CO2的实验台，并以低粘度、较优吸收性能为原则初选了4种咪唑双三氟甲磺酰亚胺盐ILs（[emim][Tf2N]、[bmim][Tf2N]、[hmim][Tf2N]和[omim][Tf2N]）为研究对象。在温度298.15 K、313.15 K及328.00 K，压力2.0~5.0 MPa条件下，分别测定了CO2在以上4种ILs中的溶解特性。结果表明：咪唑双三氟甲磺酰亚胺盐ILs对CO2有较好的吸收性能；CO2在同族ILs中的溶解度随阳离子烷基链长度的增加而增大，其在4种ILs中的溶解度顺序为：[emim][Tf2N]<[bmim][Tf2N]<[hmim][Tf2N]<[omim][Tf2N]；随着温度和压力的逐渐升高，CO2溶解度的变化幅度逐渐减小。本文还给出了3种温度下CO2在[omim][Tf2N]中的溶解度与压力的关联式。 |
| 关键词: 吸收式制冷循环 吸收制冷工质对 吸收特性 离子液体 CO2 |
| DOI： |
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| 基金项目:国家自然科学基金（50606027）资助项目。 |
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| Selection of Ionic Liquids and Absorption Properties of Ionic Liquids-CO2 Working Pairs |
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Wu Weidong, Wu Jun, Wang Zhen, Zhang Hua
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| (University of Shanghai for Science and Technology, Institute of Refrigeration and Cryogenic Engineering) |
| Abstract: |
| The selection of ionic liquids (ILs) is crucial to the performance of new absorption working pairs (ILs-CO2) and cycle characteristics of absorption refrigeration. The properties of ILs absorbing CO2 are affected directly by ILs’s species, cation structure, temperature and CO2 partial pressure. In this paper, an experimental system was designed and built to measure CO2 solubility in the ILs. On the principle of low viscosity and better absorption performance, four imidazole bis trifluoromethanesulfonimide ILs ([emim][Tf2N], [bmim][Tf2N], [hmim][Tf2N] and [omim][Tf2N]) were selected and the CO2 solubility in them was measured within 2.0 MPa to 5.0 MPa at 298.15 K, 313.15 K and 328.00 K, respectively. The results show that imidazole bis trifluoromethanesulfonimide ILs have a better performance of absorbing CO2; the longer the alkyl chain of the same family ILs is, the larger the solubility is, and the CO2 solubility increases in the order of [emim][Tf2N]<[bmim][Tf2N]<[hmim][Tf2N]<[omim][Tf2N]; the rangeability of CO2 solubility decreases as the temperature and pressure gradually increase. The correlations of pressure and CO2 solubility in [omim][Tf2N] at three temperatures are also given. |
| Key words: absorption refrigeration absorption working pairs absorption performance ionic liquid CO2 |
