In this study, the solubilities of potassium-chloride (KCl) in aqueous monoethylene glycol (MEG) solution and the vapour pressure of aqueous MEG solution containing KCl were investigated. A thermodynamic model was modified based on the data obtained to predict the solubilities of KCl, which was then applied to optimize the MEG regeneration process that is widely used in offshore gas fields. The solubility of KCl in the aqueous MEG solution decreased with an increase in MEG concentration and a decrease in temperature. The presence of KCl in aqueous MEG solution decreased the vapour pressure, thus increasing the boiling temperature at the corresponding pressure. A thermodynamic model based on the electrolyte non-random two-liquid (NRTL) coupled with the Redlich–Kwong (RK) equation of state was employed by modifying the binary interaction parameters using the experimental data. The modified model predicted the solubilities of KCl and the vapour pressure of aqueous MEG solutions, which were in good agreement with the experimental data. Moreover, the distillation column in pilot-scale MEG regeneration was inclined to simulate the movement of the offshore platform, showing decreasing MEG concentration, possibly due to the distribution issues inside the column.

中文翻译：

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电解液溶解度和柱倾角对单乙二醇再生工艺性能的影响

在这项研究中，研究了氯化钾 (KCl) 在单乙二醇 (MEG) 水溶液中的溶解度和含有 KCl 的 MEG 水溶液的蒸气压。根据获得的数据修改热力学模型以预测 KCl 的溶解度，然后将其用于优化广泛用于海上气田的 MEG 再生过程。KCl在MEG水溶液中的溶解度随着MEG浓度的增加和温度的降低而降低。MEG 水溶液中 KCl 的存在降低了蒸气压，从而提高了相应压力下的沸腾温度。通过使用实验数据修改二元相互作用参数，采用基于电解质非随机双液 (NRTL) 与 Redlich–Kwong (RK) 状态方程的热力学模型。修改后的模型预测了 KCl 的溶解度和 MEG 水溶液的蒸气压，这与实验数据非常吻合。此外，中试 MEG 再生中的蒸馏塔倾向于模拟海上平台的运动，显示 MEG 浓度降低，这可能是由于塔内的分布问题。