Experimental data and modeling of viscosity in the quinary system NaCl+KCl+CaCl2+MgCl2+H2O

Abstract The viscosities of the quinary system NaCl + KCl + CaCl₂ + MgCl₂ + H₂O and its binary subsystems are measured in the temperature range of 288.15K-308.15K. The viscosity of binary solutions of MgCl₂, NaCl, and CaCl₂ increases with the increase in concentration. In contrast, for the binary solution of KCl, the viscosity decreases with increasing concentration at low temperature and low concentration. The extended Jones-Dole model that incorporates higher-order term parameters is used to fit the viscosity of binary solutions, with a maximum Average Absolute Deviation (AAD) of 1.42%. By comparing the values of the Pearson correlation coefficients, it is found that MgCl₂ has the most significant impact on the viscosity of the quinary system MgCl₂ + KCl + NaCl + CaCl₂ + H₂O, while the impact of KCl is the least. The modified extended Jones-Dole model, with the introduction of parameter Gi, can accurately predict the quinary system, resulting in a maximum AAD value of 0.63%. Moreover, the Hu model is also applied to predict the viscosity of the quinary system, achieving a maximum AAD value being 1.54%. Compared to the Hu model, the modified extended Jones-Dole model performs better. The viscosity calculation models for the quinary system MgCl₂ + KCl + NaCl + CaCl₂ + H₂O in this study contribute key parameters for the design and optimization of the potassium chloride production process.