The ionic liquid (IL) + CO₂ system was studied for solubility measurement in three distinct [BETI] anion-based ILs: 1-ethyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide ([EMIM][BETI]), 1-butyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide ([BMIM][BETI]), and 1-hexyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide ([HMIM][BETI]) in the experimental ranges of 0.1–29.3 MPa and 303.2–373.2 K. The present study shows the solubility of CO₂ in several [BETI] anion-based ILs under specific experimental conditions and compares the effect of three cations: [HMIM], [BMIM], and [EMIM]. CO₂ solubility data were measured by determining bubble (or cloud)-point pressures at targeted CO₂ mole fractions. It was found that CO₂ absorption abilities were placed in the following order: [HMIM][BETI] > [BMIM][BETI] > [EMIM][BETI]. Moreover, these three [BETI]-containing ILs were compared with previously published data for investigating the influence of the [BETI] anion. The result shows that the three [BETI] anion-based ILs have relatively higher solubility for CO₂ than any other ILs discussed in this paper. These experimental results also show that the larger amount of the fluoro-alkyl group containing anion increases CO₂ solubility. To correlate and calculate the resulting data, the following methods were used: the PR-EoS with one-fluid mixing rule and the modified Lydersen–Joback–Reid method. The overall absolute average relative deviation were 0.0172, 0.0246, and 0.0118 for CO₂ + [EMIM][BETI], CO₂ + [BMIM][BETI], and CO₂ + [HMIM][BETI] systems, respectively.

中文翻译：

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CO ₂在双（五氟乙基磺酰基）亚胺（[BETI]）阴离子型离子液体中的溶解度测量和相关性：[EMIM] [BETI]，[BMIM] [BETI]，[HMIM] [BETI]

研究了离子液体（IL）+ CO ₂系统在三种基于[BETI]阴离子的不同IL中的溶解度测量：1-乙基-3-甲基咪唑鎓双（五氟乙基磺酰基）酰亚胺（[EMIM] [BETI]），1-丁基在0.1–29.3 MPa和303.2的试验范围内，-3-甲基咪唑双（五氟乙基磺酰基）酰亚胺（[BMIM] [BETI]）和1-己基-3-甲基咪唑双（五氟乙基磺酰基）酰亚胺（[HMIM] [BETI]）在0.1–29.3 MPa和303.2的实验范围内–373.2K。本研究显示了在特定实验条件下，CO ₂在几种基于[BETI]阴离子的ILs中的溶解度，并比较了三种阳离子[HMIM]，[BMIM]和[EMIM]的作用。通过确定目标CO ₂摩尔分数下的气泡（或浊点）压力来测量CO ₂溶解度数据。发现一氧化碳_2种吸收能力按以下顺序排列：[HMIM] [BETI]> [BMIM] [BETI]> [EMIM] [BETI]。此外，将这三种含[BETI]的IL与先前发表的数据进行了比较，以研究[BETI]阴离子的影响。结果表明，三种基于[BETI]阴离子的ILs对CO _2的溶解度均比本文讨论的任何其他ILs高。这些实验结果还表明，较大量的含氟烷基的阴离子增加了CO _2的溶解度。为了关联和计算结果数据，使用了以下方法：具有单流体混合规则的PR-EoS和改进的Lydersen-Joback-Reid方法。CO ₂的总体绝对平均相对偏差为0.0172、0.0246和0.0118+ [EMIM] [BETI]，CO ₂ + [BMIM] [BETI]和CO ₂ + [HMIM] [BETI]系统。