Prediction of phase behavior of CO2–NH3–H2O system by using the UNIQUAC-Non Random Factor (NRF) model

Modeling study of the heat of absorption and solid precipitation for CO2capture by chilled ammonia

“…2(b) and compared with the experimental data reported by Bates and Pinching. 56 All equilibrium constants has similar values and tendency except that reported by Pazuki et al 49 at different temperatures. In Fig.…”

“…Fig. 2(a) shows the equilibrium constants for NH 3 protonation (R4), in which ln K 4 is given by Edwards et al, 52 Kawazuishi and Prausnitz, 53 Pazuki et al, 49 Clegg and Brimblecombe, 54 and Aspen Plus (V7.2). The corresponding enthalpy change, ÀDH NH 3 , calculated by eqn (8) are shown in Fig.…”

Characterization of ammonia-based CO2 capture process using ion speciation

“…Numerous thermodynamic models for NH 3 -CO 2 -H 2 O system have been introduced such as Pitzer model and NRTL model (Krop, 1999;Kurz et al, 1995;Mathias et al, 2009Mathias et al, , 2010Pazuki et al, 2006;Pitzer, 1973). These were verified through the measurement of partial pressures of H 2 O, NH 3 and CO 2 in gas phase except for Holmes et al (1998).…”

“…A different approach to obtain the ion concentration in aqueous ammonia, thermodynamic model such as vapor-liquid equilibrium (VLE) model, was often employed (Krop, 1999;Kurz et al, 1995;Mathias et al, 2009Mathias et al, , 2010Pazuki et al, 2006;Pitzer, 1973). Most of reported studies with thermodynamic models were verified through partial pressures of ammonia, water, and CO 2 in the head space (Mathias et al, 2009(Mathias et al, , 2010Krop, 1999;Kurz et al, 1995;Pazuki et al, 2006), or vapor phase data only. To the best of the authors' knowledge, only Holmes et al (1998) compared the experimental work of ammonium speciation in its liquid phase with the simulation results.…”

A comparative study of thermodynamic electrolyte models applied to the Solvay soda system

“…The next step involved estimation of partial pressure of water, carbon dioxide and ammonia using their saturation pressure values from Piotrowski et al (1998) along with the Henry constants calculated according to Pazuki et al (2006a). Total pressure was calculated as the sum of values of partial pressure for all components of the gas phase.…”