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http://dx.doi.org/10.5762/KAIS.2017.18.10.136

Comparative Study on the Estimation of CO2 absorption Equilibrium in Methanol using PC-SAFT equation of state and Two-model approach.  

Noh, Jaehyun (Department of Chemical Engineering, Kong Ju National University)
Park, Hoey Kyung (Department of Chemical Engineering, Kong Ju National University)
Kim, Dongsun (Department of Chemical Engineering, Kong Ju National University)
Cho, Jungho (Department of Chemical Engineering, Kong Ju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.10, 2017 , pp. 136-152 More about this Journal
Abstract
The thermodynamic models, PC-SAFT (Perturbed-Chain Statistical Associated Fluid Theory) state equation and the Two-model approach liquid activity coefficient model NRTL (Non Random Two Liquid) + Henry + Peng-Robinson, for modeling the Rectisol process using methanol aqueous solution as the $CO_2$ removal solvent were compared. In addition, to determine the new binary interaction parameters of the PC-SAFT state equations and the Henry's constant of the two-model approach, absorption equilibrium experiments between carbon dioxide and methanol at 273.25K and 262.35K were carried out and regression analysis was performed. The accuracy of the newly determined parameters was verified through the regression results of the experimental data. These model equations and validated parameters were used to model the carbon dioxide removal process. In the case of using the two-model approach, the methanol solvent flow rate required to remove 99.00% of $CO_2$ was estimated to be approximately 43.72% higher, the cooling water consumption in the distillation tower was 39.22% higher, and the steam consumption was 43.09% higher than that using PC-SAFT EOS. In conclusion, the Rectisol process operating under high pressure was designed to be larger than that using the PC-SAFT state equation when modeled using the liquid activity coefficient model equation with Henry's relation. For this reason, if the quantity of low-solubility gas components dissolved in a liquid at a constant temperature is proportional to the partial pressure of the gas phase, the carbon dioxide with high solubility in methanol does not predict the absorption characteristics between methanol and carbon dioxide.
Keywords
PC-SAFT EOS; Henry's law; $Rectisol^{(R)}$ process; methanol solvent; carbon dioxide;
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