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Application of a sequential multi-solid-liquid equilibrium approach using PC-SAFT for accurate estimation of wax formation

机译：用PC-Saft应用序贯多固液平衡方法，以准确估算蜡形成

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Several existing thermodynamic models for Wax precipitation use cubic EOS and average properties for petroleum fractions. To improve predictions, this work introduces a thermodynamic model using a multi-solid framework in a sequential equilibrium calculation procedure. The PC-SAFT EOS is used to predict liquid phase properties. Binary interaction coefficients and difference of heat capacities between solid and liquid are adjusted to minimize the deviations caused by the employment of averaged relations for properties of hydrocarbon cuts. Three groups of oil samples are chosen for verification. First, the Wax precipitation data of three synthetic mixtures from Pauly et al. [1] are estimated, and the modeling results are compared to the predicted results of Dalirsefat and Feyzi [2] and Schou Pedersen et al. [3]. Also, two crude oil samples with Paraffin, Naphthene, and Aromatic (PNA) content from Pan et al. [4] are used for evaluation. Finally, the suggested model is used to calculate weight percent of precipitated Wax and Wax appearance temperature (WAT) of six crude oil samples from North Sea [3]. The calculated predictions of the suggested model are compared to the works of Schou Pedersen et al. [3], Lira-Galeana et al. [5], and Bagherinia et al. [6]. The deviations for WATs and precipitation amounts from experimental data are lower compared to previous studies. The average absolute deviation for precipitated Wax weight of the North Sea samples is 0.19 in comparison to 0.61, 0.33, and 0.4 of Schou Pedersen et al. [3], Lira-Galeana et al. [5], and Bagherinia et al. [6], respectively.
机译：用于蜡降水的几种现有的热力学模型使用立方体EOS和石油级分的平均性质。为了改善预测，该工作在顺序平衡计算过程中使用多固体框架引入了热力学模型。 PC-SAFT EOS用于预测液相特性。调整二元相互作用系数和固体和液体之间的热容差，以最小化由使用烃切口性质的平均关系所引起的偏差。选择三组油样用于验证。首先，Pauly等人的三种合成混合物的蜡降沉淀数据。估计[1]估计，将建模结果与Dalirsefat和Feyzi [2]和Schou Pedersen等人进行比较。 [3]。此外，来自Pan等人的石蜡，环烷烃和芳族（PNA）含量的两种原油样品。 [4]用于评估。最后，建议的模型用于计算来自北海的六种原油样品的沉淀蜡和蜡出现温度（Wat）的重量百分比[3]。将建议模型的计算预测与Schou Pedersen等人的作品进行了比较。 [3]，Lira-Galeana等。 [5]和Bagherinia等。 [6]。与先前的研究相比，实验数据的湿法和降水量的偏差较低。与0.61,0.33和0.4的Schou Pedersen等人相比，北海样品的沉淀蜡重量的平均绝对偏差为0.19。 [3]，Lira-Galeana等。 [5]和Bagherinia等。 [6]分别。

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