To support the development of desalination processes for high salinity produced waters, we developed a comprehensive thermodynamic model that reliably predicts the thermodynamic properties and phase behavior of produced water. This study extends a previously developed thermodynamic model for the aqueous hexary oceanic salt system by incorporating the Sr²⁺ and Ba²⁺ ions. Based on the electrolyte nonrandom two-liquid theory, the model requires two adjustable binary interaction parameters for each water-electrolyte and electrolyte-electrolyte pair that has a common ion. The binary interaction parameters for the electrolyte-electrolyte pairs involving Sr²⁺ and Ba²⁺ ions were identified using thermodynamic and salt solubility data. The model was validated for temperatures from 273.15 K to 473.15 K and electrolyte concentrations from infinite dilution to salt saturation. Extension of the model to include HCO₃⁻, CO₃²⁻, and CO₂ is currently in progress.

为了支持高盐度采出水的脱盐工艺的发展，我们开发了一个综合的热力学模型，该模型可以可靠地预测采出水的热力学性质和相行为。这项研究通过并入Sr ²⁺和Ba ²⁺离子，扩展了先前开发的用于含水己酸海洋盐系统的热力学模型。基于电解质非随机两液理论，该模型对于具有共同离子的每个水电解质和电解质-电解质对都需要两个可调的二元相互作用参数。涉及Sr ²⁺和Ba ²⁺的电解质-电解质对的二元相互作用参数使用热力学和盐溶解度数据鉴定离子。验证了该模型的温度范围为273.15 K至473.15 K，电解质浓度从无限稀释到盐饱和。该模型扩展到包含HCO ₃ ^-，CO ₃ ^2-，和CO ₂目前正在进行中。