Measuring solubility of carbon dioxide in aqueous blends of N-methyldiethanolamine and 2-((2-aminoethyl)amino)ethanol at low CO2 loadings and modelling by electrolyte SAFT-HR EoS

Recent progress and new developments in post-combustion carbon-capture technology with amine based solvents

“…The moderate stability of IPAE carbamate and the alcohol chain length were influential in the resulting high cyclic loading. Zoghi and Feyzi (2013) and Najafloo et al (2015) reported on the CO 2 solubility in the ternary solvent (H 2 O + MDEA + AEEA). The solubility of CO 2 was significantly enhanced by addition of AEEA, but the increase in CO 2 solubility was nonlinear with the proportion of AEEA in the mixed solvent.…”

“…The models used to correlate or predict the VLE of CO 2 /aqueous alkanolamine solutions fall into the following three categories (Téllez-Arredondo and Medeiros, 2013) (i) Non-rigorous models: These empirical models are based on equilibrium constants of chemical reactions and do not consider solvent non-ideality through activity coefficient. The Kent-Eisenberg is one of the earliest models and it is still used today in modified forms (e.g., Chang et al, 2013;Hsu et al, 2014;Li et al, 2014a,b;Oktavian et al, 2014 (phi-phi approach), capable of representing molecular association, are increasing in use e.g., PC-SAFT (Pahlavanzadeh and Fakouri Baygi, 2013), electrolyte EOS (Diab et al, 2013), SAFT-VR (Rodriguez et al, 2012), CPA (Zoghi and Feyzi, 2013), PR-TS (Haghtalab and Shojaeian, 2015), electrolyte SAFT-HR EoS (Najafloo et al, 2015), eCTS EoS (Téllez-Arredondo and Medeiros, 2013). Diab et al (2013) incorporated experimental speciation data in the electrolyte EoS model and consequently, the model was able to represent liquid phase speciation and CO 2 partial pressure in a satisfactory manner.…”

Solubility and thermodynamic modeling of hydrogen sulfide in aqueous (diisopropanolamine+2-amino-2-methyl-1-propanol+piperazine) solution at high pressure

“…15 presented in table 5. Moreover, all of the measurements are presented as the H 2 S partial pressure against the acid gas loading with their uncertainties as shown in table 6.…”

“…Thus, knowledge of the solubility of the acid gases in blended amines is necessary in the design of industrial gas absorption units. However, most of the equilibrium data is devoted to the solubility of CO 2 [15][16][17][18], and less data are available for H 2 S solubility particularly in blended alkanolamines. The several works [19,20] for solubility of H 2 S in alkanolamines are given as follows.…”

Modeling solubility of CO 2 in aqueous MDEA solution using electrolyte SAFT-HR EoS

“…Najafloo et al [10,18] have recently developed eSAFT-HR EoS in which the nonelectrolyte part of the EoS is expressed by SAFT-HR [19] EoS and, for long-range electrostatic interactions between ions, the explicit simple version of the Mean Spherical Approximation (MSA) theory is used. The eSAFT-HR EoS [10,18] has been successfully applied to obtain activity coefficients of the species present in strong electrolyte solutions in a wide range of concentration.…”