Improving the accuracy of the Eyring equation by pseudo‐ideal solution model to predict the viscosity of the mono‐ethanol amine‐[Bmim] PF6 ionic liquid blends in a CO2 capturing pilot plant

AbstractThe purpose of the present study was to propose a new simulation model for calculation of the viscosity of the mono‐ethanol amine‐ionic liquid (MEA‐IL) solvent in the CO2‐capturing pilot plant. To do so, a combination of the pseudo‐ideal solution model (PISM) and Eyring's mixture viscosity equation was implemented in MATLAB. Moreover, the various thermodynamic models were used to calculate viscosity, using solvent containing MEA‐IL in the high CO2 feed gas. The present study determined the viscosities of the MEA‐IL blends at different concentrations and various temperatures in the CO2 capturing pilot plant. The results were comparable to those obtained from the Eyring‐PISM model, Eyring‐Wilson method, Cheng and Meisen a previous study equation, and the Aspen Plus and Promax with electrolyte non‐random two‐liquid model that presented the actual viscosity values of the liquid solutions. The calculated solvent viscosity values with the Eyring‐PISM model at different temperature profiles were achieved using an average absolute deviation (AAD) of about 1.164% and 1.422% in absorber and desorber for solvent (MEA = 27 wt% and IL = 34.2 wt%) and 1.578% and 1.868% in absorber and desorber for solvent (MEA = 29 wt% and IL = 37.12 wt%), respectively. The consideration of a suitable model for the determination of viscosity has a significant role in energy consumption in the CO2‐capturing pilot plant. The estimated energy consumption with the Eyring‐PISM model was achieved using an AAD of about 0.652% for solvent (MEA = 27 wt% and IL = 34.2 wt%) and 0.502% for solvent (MEA = 29 wt% and IL = 37.12 wt%), respectively. The results obtained from the Eyring‐PISM simulation model using the experimental data revealed a high degree of accuracy.