Shiflett Mark B, Yokozeki A
DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880, USA.
J Phys Chem B. 2007 Mar 1;111(8):2070-4. doi: 10.1021/jp067627+. Epub 2007 Feb 1.
Solubility measurements of carbon dioxide in 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide have been performed with a gravimetric microbalance at temperatures of about 282, 297, 323, and 348 K and pressures up to about 2 MPa. Two different sources for the ionic liquid are examined in this work: an ultrapure sample from NIST (the IUPAC task force sample) and a commercially available sample. Both samples show nearly identical solubility behaviors, being undistinguishable within experimental uncertainties. Solubility (pressure-temperature-composition) data have been well correlated with an equation-of-state (EOS) model used in our previous works. The EOS model calculations are compared with experimental solubility data for the same system in the literature. The present EOS has predicted partial immiscibility at the CO2-rich side solutions. To prove this prediction, vapor-liquid-liquid equilibrium experiments have been made, and our predictions have been confirmed.
在约282、297、323和348 K的温度以及高达约2 MPa的压力下，使用重量微天平对二氧化碳在1-己基-3-甲基咪唑双（三氟甲基磺酰）亚胺中的溶解度进行了测量。在这项工作中研究了离子液体的两种不同来源：来自美国国家标准与技术研究院的超纯样品（国际纯粹与应用化学联合会任务组样品）和市售样品。两种样品都表现出几乎相同的溶解行为，在实验不确定度范围内无法区分。溶解度（压力-温度-组成）数据已与我们之前工作中使用的状态方程（EOS）模型很好地关联。将EOS模型计算结果与文献中同一体系的实验溶解度数据进行了比较。当前的EOS预测在富二氧化碳侧溶液中会出现部分互不相溶。为了验证这一预测，进行了气液液平衡实验，我们的预测得到了证实。
