Abstract A general one-parameter friction theory model based on the recently developed cubic-plus-chain equation of state (Sisco and Abutaqiya et al., Industrial & Engineering Chemistry Research, 2019, 58, 7341) is proposed to describe the viscosity behavior of n-alkanes. The model is considered a one-parameter model because it only requires one characteristic critical viscosity per compound to predict viscosity. This general model showed accurate viscosity modeling results for 15 n-alkanes ranging from methane to n-octadecane over a wide range of temperatures and pressures up to 1000 bar (1.51% AAPD). By using simple mixing rules, the model is further applied to predict the viscosity of 13 binary to quaternary mixtures of n-alkanes with accuracies close to experimental uncertainty (3.77% AAPD), making it a promising viscosity prediction methodology for industrial applications. A quantitative and qualitative comparison of the different friction theory viscosity models is also included. Additionally, an empirical correlation for estimating the characteristic critical viscosity is provided to extend the model to n-alkanes whose characteristic critical viscosity is not reported. The proposed viscosity model strikes a reasonable balance between the accuracy of viscosity predictions, simplicity of use and faster computational times.

中文翻译：

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三次加链状态方程的一参数摩擦理论粘度模型

摘要 基于最近开发的立方加链状态方程 (Sisco and Abutaqiya et al., Industrial & Engineering Chemistry Research, 2019, 58, 7341) 提出了一种通用的单参数摩擦理论模型来描述正构烷烃。该模型被认为是一种单参数模型，因为它只需要每种化合物一个特征临界粘度来预测粘度。该通用模型显示了从甲烷到正十八烷的 15 种正烷烃在高达 1000 bar (1.51% AAPD) 的广泛温度和压力范围内的准确粘度建模结果。通过使用简单的混合规则，该模型进一步应用于预测 13 二元至四元正构烷烃混合物的粘度，其精度接近实验不确定性 (3.77% AAPD)，使其成为工业应用中很有前景的粘度预测方法。还包括对不同摩擦理论粘度模型的定量和定性比较。此外，还提供了用于估计特征临界粘度的经验相关性，以将模型扩展到未报告特征临界粘度的正构烷烃。所提出的粘度模型在粘度预测的准确性、使用的简单性和更快的计算时间之间取得了合理的平衡。提供了用于估计特征临界粘度的经验相关性，以将模型扩展到未报告特征临界粘度的正构烷烃。所提出的粘度模型在粘度预测的准确性、使用的简单性和更快的计算时间之间取得了合理的平衡。提供了用于估计特征临界粘度的经验相关性，以将模型扩展到未报告特征临界粘度的正构烷烃。所提出的粘度模型在粘度预测的准确性、使用的简单性和更快的计算时间之间取得了合理的平衡。