Abstract
Determining the solubility of gases in solvents and considering non-idealities at different operating conditions are essential to design a cost-effective and energy-efficient absorption process. In this work, using a lab-made set-up, solubility of ethylene in N-methyl-2-pyrrolidone (NMP) was measured at different temperatures (278.15, 298.15, and 328.15 K) and pressures up to 14 bar, and the kinetic and equilibrium data were obtained. Accordingly, Henry’s law constants are calculated at various temperatures. Then, thermodynamic modeling was accomplished by applying Peng-Robinson equation of state (PR-EOS) and Wilson activity coefficient model, and the binary interaction parameters were estimated. By the thermodynamic modeling, positive deviation from ideal behavior was apparently observed. Due to low absolute average deviation of < 7.7%, the correlated model was able to predict the ethylene solubility in NMP with a reliable accuracy.
Highlights
Ethylene is one of important petrochemical feed stocks which is utilized as the main feed of polyethylene, polyethylene oxide, polyethylene glycol, and ethanol production plants [10, 18, 22, 31]
Various solvents were proposed for ethylene absorption in the literature
After modeling with Peng-Robinson equation of state (PR-EOS), solubility data and binary interaction parameters were obtained with great accuracy
Summary
Ethylene is one of important petrochemical feed stocks which is utilized as the main feed of polyethylene, polyethylene oxide, polyethylene glycol, and ethanol production plants [10, 18, 22, 31]. Charin et al [6] reported phase equilibrium data at high pressures (up to 160 bar) for the binary and ternary systems formed by propane + NMP + methanol in the temperature range of 363–393 K. After modeling with PR-EOS, solubility data and binary interaction parameters were obtained with great accuracy.
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