Monoethylene glycol (MEG) is used as hydrate inhibitor in natural gas exploitation. During the process, MEG mixed with produced water and salts must be regenerated. Therefore, salt solubility and physicochemical properties of MEG aqueous mixture with electrolytes are useful to operate the regeneration unit. This work determines density and electrical conductivity data at 298.15 K for water+MEG+CaCl₂ systems. The density data were correlated applying the excess volume approach and Redlich Kister expansion, resulting absolute and relative mean deviations of 3 × 10^–4 g‧cm^–3 and 0.028%. For electrical conductivity correlation a semiempirical model was applied resulting absolute and relative mean deviations of 1.27 mS‧cm^–1 and 3.53%. CaCl₂ solubilities in water-MEG mixtures at 298.15 and 323.15 K were also measured. The proposed analytical method used precise density measurements to determine salt solubility. Moreover, the solid phase composition was determined by thermogravimetry analysis. Four different solid phases were identified as function of the solvent composition. At 298.15 K the addition of MEG changed the solid phase from CaCl₂•4H₂O to CaCl₂•3H₂O•MEG for w’_MEG ≥0.36. Regarding 323.15 K, solid phase changed from CaCl₂•2H₂O to CaCl₂•H₂O•MEG for w’_MEG≥0.30. Density, electrical conductivities and CaCl₂ solubilities were accurately determined and are of interest to the natural gas industry.

单乙二醇 (MEG) 在天然气开采中用作水合物抑制剂。在此过程中，MEG 与采出水和盐混合后必须进行再生。因此，具有电解质的 MEG 水性混合物的盐溶解度和物理化学性质可用于操作再生单元。这项工作确定了水+MEG+CaCl ₂系统在 298.15 K 下的密度和电导率数据。应用超量体积法和 Redlich Kister 膨胀法将密度数据关联起来，得到 3 × 10 ^–4 g·cm ^–3和 0.028% 的绝对和相对平均偏差。对于电导率相关性，应用了半经验模型，得出的绝对和相对平均偏差为 1.27 mS‧cm ^–1和 3.53%。氯化钙还测量了₂在 298.15 和 323.15 K 下在水-MEG 混合物中的溶解度。建议的分析方法使用精确的密度测量来确定盐的溶解度。此外，固相组成通过热重分析确定。四种不同的固相被确定为溶剂组成的函数。在 298.15 K 时，加入 MEG 将固相从 CaCl ₂ •4H ₂ O 变为 CaCl ₂ •3H ₂ O•MEG，w' _MEG ≥0.36。对于 323.15 K，w' _{MEG 的}固相从 CaCl ₂ •2H ₂ O 变为 CaCl ₂ •H ₂ O• _MEG≥0.30。密度、电导率和 CaCl ₂溶解度得到准确测定，这对天然气工业很重要。