Abstract Wax precipitation is a major flow assurance issue for petroleum production, oil blending, downstream processing, and oil products usage. While numerous thermodynamic models have been proposed to calculate wax appearance temperature (WAT) and precipitation profile at temperatures below WAT, the existing models are correlative in nature and fail to comply with phase behavior experimentally observed for wax precipitation. This work presents a predictive thermodynamic model for wax precipitation based on an explicit co-crystal formation assumption for precipitated wax, a treatment consistent with experimental findings. With a simple Flory-Huggins expression accounting for the liquid phase nonideality and the treatment of lamella structure for wax precipitation below WAT, the model satisfactorily predicts WAT at low pressures for multicomponent paraffin mixtures and wax precipitation amounts and contents as the temperature drops below WAT.

中文翻译：

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预测正构烷烃系统的蜡出现温度和沉淀曲线：显式共晶模型

摘要 蜡沉淀是石油生产、石油调和、下游加工和石油产品使用的主要流动保证问题。虽然已经提出了许多热力学模型来计算低于 WAT 的温度下的蜡出现温度 (WAT) 和析出曲线，但现有模型本质上是相关的，并且不符合蜡析出实验观察到的相行为。这项工作基于对沉淀蜡的明确共晶形成假设提出了蜡沉淀的预测热力学模型，这种处理与实验结果一致。用一个简单的 Flory-Huggins 表达式来解释液相非理想性和在 WAT 以下蜡沉淀的层状结构处理，