Modeling and simulation of NaOH-NH3-CO2-H2O equilibrium system; A review on electrolyte solution prediction models
Volume Title: 1
1School of Chemical, Petroleum and Gas Engineering Iran University of Science and Technology, Tehran, Iran
2هیات علمی و رئیس دانشکده
In this study, the carbon dioxide (CO2) absorption process using equilibrium aqueous electrolyte solution of sodium hydroxide-ammonia-carbon dioxide was simulated in a packed column. Several models such as NRTL, eNRTL, UNIQUAC, Pitzer, etc. have been developed to predict the equilibrium behavior of electrolyte solutions, in which the history of these models is briefly explained. Pittzer model was used to calculate the activity coefficients of aqueous electrolyte. The equilibrium equations of mass, charge, chemical, and fuzzy equilibrium and Pittzer equations are solved simultaneously to simulate this process. The solubility of CO2 at different temperatures has been studied and predicted in this system. The results show that by increasing the temperature, the CO2 solubility in the ammonia and sodium hydroxide solution decreases and also, by increasing CO2 molality, the CO2 partial pressure and total pressure of system increase.