SOLUBILITY PREDICTION OF CO2 IN SEVERAL PHYSICAL LIQUID SOLVENTS USING CHEMCAD AND HYSYS SIMULATORS

Abstract

CHEMCAD and HYSYS process simulators were used to analysis the literature experimental data and predict the solubility of CO₂ in three physical solvents (sulfolane, propylene carbonate (PC), and n-methyl-2-pyrrolidone (NMP)) at different temperatures (298.15 , 313.15 , 323.15, and 373.15 K). Two thermodynamic models were used, the first using Peng-Robinson equation of state (PR-EOS) and the second using Soave-Redlich-Kwong equation of state (SRK-EOS). The solubility data of CO₂ in all three physical solvents systems were correlated with CHEMCAD simulator using the SRK model without modification (k_ij = 0).The results showed a small deviation (less than 5%), but higher deviation (about 10%) was noticed only for CO₂-NMP system at temperature 373 K. Whereas the results of PR model showed a high deviation (about 20%) with all the three physical solvents systems. Modifications performed by editing user defined binary interaction parameters (BIP) of the systems used, give good results for both simulators.