In this work, a new simple linear equation was proposed to represent the pressure dependence of the viscosity of ionic liquids. Literature experimental viscosity data were utilized and correlated as a function of pressure. The viscosity data of various ionic liquids including imidazolium, pyridinium, pyrrolidinium, and ammonium with a variety of anions were considered to examine the generality of the proposed equation. We showed that this equation provides accurate descriptions of the viscosity of ionic liquids as a function of pressure. Therefore, the proposed linear equation combines simplicity and accuracy. In addition, a new equation was proposed to incorporate both the temperature and pressure dependence of the viscosity (η–T–p). The results indicated that the η–T–p model shows high accuracy with an overall average absolute relative deviation of 2.69% in the temperature range of 283.15–363.15 K and the pressure range of 0.06–300 MPa. Moreover, we analyzed the pressure-viscosity coefficient, which quantifies the effect of pressure on the fluid’s viscosity. The calculated pressure-viscosity coefficient was found to increase with increasing alkyl chain length of the cation.

在这项工作中，提出了一个新的简单线性方程来表示离子液体粘度的压力依赖性。利用文献实验粘度数据，并将其与压力相关。考虑了咪唑鎓，吡啶鎓，吡咯烷鎓和铵与各种阴离子的各种离子液体的粘度数据，以检验所提出方程的一般性。我们证明了该方程式提供了离子液体粘度随压力变化的准确描述。因此，所提出的线性方程式结合了简单性和准确性。此外，一个新的方程式，提出了以纳入粘度的温度和压力的关系两者（η - Ť - p）。该结果表明，η - Ť - p模型示出了高的精度用的总平均绝对相对的2.69％的温度范围内283.15-363.15的K偏差和0.06-300兆帕的压力范围。此外，我们分析了压力-粘度系数，从而量化了压力对流体粘度的影响。发现所计算的压力-粘度系数随着阳离子的烷基链长度的增加而增加。