Heat capacities of alcohol and water predicted by CPA EoS
Eleven parameter estimation methods with different properties were employed to examine the heat capacities of polar associating fluids including methanol,ethanol,and water using the cubic plus association(CPA)equation of state(EoS).The objective was to improve prediction accuracy of the CPA equation in heat capacity properties.The results reveal that when the heat capacity is not incorporated in CPA parameter estimation,the vapor pressure must be considered.The predictions of liquid-phase heat capacity become more accurate when the accuracy of the vapor pressure increases.When the heat capacity property is incorporated into the parameter estimation,the CPA equation cannot have high accuracy in calculating all heat capacity properties simultaneously.However,the calculation accuracy of the isobaric heat capacity in the liquid phase remains the highest among all heat capacity properties.When only considering the isobaric heat capacity property in liquid phase for parameter estimation,the average absolute relative deviation value is≤3%for vapor pressure,density and isobaric heat capacity in liquid phase.
cubic plus association equation of stateassociating fluidsheat capacityvapor pressure
万方数据
维普
