In this paper, new experimental measurements of methane (CH₄) solubility in the ionic liquid (IL) 1-hexyl-3-methylimidazolium tricyanomethanide ([hmim][TCM]) are presented. The solubility data were obtained using a synthetic method based on bubble-point pressure measurements for concentrations ranging from (2–10) CH₄ mole% and within a temperature range of (293–363 K) and pressures up to 10 MPa. The results obtained in this work were compared with those obtained for other ILs. The IL [hmim][TCM] was found to show the lowest CH₄ solubility, which is desired for application of this IL as gas sweetening solvent (low co-absorption of hydrocarbons). Moreover, the CH₄ solubility was compared to the CO₂ solubility in the same IL, showing that [hmim][TCM] can selectively absorb CO₂ from natural gas. The experimental solubility data of CH₄ in [hmim][TCM] were accurately modeled using the PR-EoS with only one temperature-independent binary interaction parameter.

本文提出了甲烷（CH ₄）在离子液体（IL）1-己基-3-甲基咪唑三氰胺（[hmim] [TCM]）中溶解度的新实验方法。溶解度数据是使用基于气泡点压力测量的合成方法获得的，浓度范围为（2-10）CH ₄摩尔％，温度范围为（293-363 K），压力最高为10 MPa。将这项工作中获得的结果与其他IL的结果进行比较。发现IL [hmim] [TCM]表现出最低的CH ₄溶解度，这对于将该IL用作气体甜味剂（烃的低共吸收）是理想的。此外，将CH _4的溶解度与CO ₂进行了比较在相同的IL中溶解度高，表明[hmim] [TCM]可以选择性地从天然气中吸收CO ₂。使用仅具有一个温度独立的二元相互作用参数的PR-EoS，可以精确地模拟CH ₄在[hmim] [TCM]中的溶解度数据。