Absorption of Carbon Dioxide in Two Binary Mixtures of Ionic Liquids
Absorption of Carbon Dioxide in Two Binary Mixtures of Ionic Liquids
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DOI：
10.1021/ie303238h
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发表时间：
2013-05-01
影响因子：
4.2
通讯作者：
Soto, Ana
中科院分区：
文献类型：
--
作者：
Pinto, Alicia M.;Rodriguez, Hector;Soto, Ana
离子液体是一种潜在的替代传统工艺的基础，该工艺基于目前用于二氧化碳捕获的水胺。在完全保持离子液体特性的同时，离子液体的混合物提供了比“单一”离子液体的固有可调特性更多程度的定制。本文研究了1-乙基-3-甲基咪唑双(三氟甲磺酰基)亚胺+1-乙基-3-甲基咪唑乙基硫酸酯和1-乙基-3-甲基咪唑双(三氟甲磺酰基)亚胺+1-丁基-3-乙基咪唑乙硫酸酯两种互溶离子液体的混合物。在298.2 K下，它们在高达约16bar的压力范围内吸收二氧化碳的能力是在不同混合物组成比例下测定的；它们的热相变温度和物理性质(密度、粘度和表面张力)是在整个组成范围内、在大气压和相同温度下测定的。吸收数据用NRTL(非随机双液体)模型进行了充分的关联，而不同的方程成功地关联了混合物的物理性质，并根据纯离子液体组分的性质知识对其进行了预测。
Ionic liquids are the basis of a potential alternative to conventional processes based on aqueous amines currently used for carbon dioxide capture. Mixtures of ionic liquids offer an additional degree of tailoring over the intrinsic tunable properties of "single" ionic liquids, while totally maintaining the ionic liquid character. In this work, two mixtures of mutually miscible ionic liquids have been investigated, namely, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide + 1-ethyl-3-methylimidazolium ethylsulfate and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide + 1-butyl-3-ethylimidazolium ethylsulfate. Their ability to absorb carbon dioxide in the pressure range up to ca. 16 bar, at 298.2 K, was determined at different composition ratios of the mixtures; their thermal phase transition temperatures and physical properties (density, viscosity, and surface tension) were determined over the entire compositional range, at atmospheric pressure and the same temperature. The absorption data were adequately correlated by the NRTL (Non-Random Two-Liquid) model, whereas different equations were successful in satisfactorily correlating the physical properties of the mixtures and in predicting them from knowledge of the properties of the pure ionic liquid components.