Modeling of (vapor+liquid) equilibrium and enthalpy of solution of carbon dioxide (CO2) in aqueous methyldiethanolamine (MDEA) solutions

Flow calorimetry: a technique for caracterisation of liquid-liquid and liquid-gas systems

“…Each contribution is related to one chemical or physical reaction, occurring during dissolution. Thermodynamic models (Arcis et al [1]) can predict those terms. As shown in figure 4, the enthalpy of absorption, in tertiary amine solutions, is mainly impacted by the enthalpy of protonation.…”

“…The models developed with such equilibrium data can correlate gas solubility. However it have been shown [1] that they cannot correctly predict enthalpic data. The validity of a model should be checked out by measurements of enthalpy of solution of CO 2 [1].…”

“…However it have been shown [1] that they cannot correctly predict enthalpic data. The validity of a model should be checked out by measurements of enthalpy of solution of CO 2 [1]. This enthalpy is strongly dependent on the mechanism of absorption and then to the phase composition reached at equilibrium.…”

Thermodynamics of CO2-MDEA using eNRTL with Differential Evolution Algorithm

“…We set all molecule-molecule and electrolyte-electrolyte binary parameters to zero, unless specified otherwise, and molecule-electrolyte binary parameters to 8 and -4 as reported in NRTL model [12]. The non randomness factor (α) is fixed at 0.2, but it can be variable from 0.1 to 0.9.…”

“…Faramarzi et al [10], used the extended UNIQUAC model [11] to represent VLE for CO 2 absorption in aqueous MDEA, MEA, and mixtures of the two alkanolamines. Arcis et al [12] also fitted the VLE data with Pitzer's equation and used the thermodynamic model to estimate the enthalpy of solution of CO 2 in aqueous MDEA.…”