Chilled ammonia process for CO2 capture

Aqueous Ammonia (NH3) Based Post Combustion CO2Capture: A Review

“…The equilibrium NH 3 partial pressure for a solvent at the ammonia concentration of 28% and CO 2 loading of 0.4 and 8°C is more than 0.05 bar equivalent to 50 000 ppm at atmospheric pressure (Fig. 9), according to Darde et al (2009). The large discrepancy between the two references is most likely indicative of the uncertainty around the thermodynamics of liquid-solid systems.…”

“…In this process as described in the open literature (Darde et al, 2009;Telikapalli et al, 2011), CO 2 is absorbed in a highly ammoniated solution at low temperatures (0-10°C), producing a slurry containing ammonium bicarbonate. In the stripper, ammonium bicarbonate is converted to ammonium carbonate at temperatures above 100°C and pressures of 20-40 bar.…”

“…Figure 9 shows predicted partial and total pressure at the ammonia concentration of 28% and temperature of 8°C; Figure 10 predicted equilibrium CO 2 and NH 3 partial pressure as a function of CO 2 loading at the ammonia concentration of 5 wt% and the temperature of 10, 20 and 30°C; Figure 11 predicted equilibrium NH 3 and CO 2 partial pressure as a function of CO 2 loading at the ammonia concentration of 2.5 and 5% and the temperature of 10°C. The conditions for Figure 9 are relevant for the chilled ammonia process in which precipitation of products is taken into account while the conditions for Figures 10 and 11 are for processes at ambient temperatures, used by Powerspan, CSIRO and KIST at lower ammonia Predicted partial and total pressure at the ammonia concentration of 28 wt% and the temperature of 8°C (Darde et al, 2009 Predicted equilibrium CO 2 and NH 3 partial pressure as a function of CO 2 loading at the ammonia concentration of 5 wt% and the temperature of 10°C. Aspen Plus Ò V7.3 with a built-in thermodynamic model for CO 2 -NH 3 -H 2 O was used to obtain equilibrium pressure in Figure 10 and Figure 11 (AspenTechnology, 2012;Que and Chen, 2011).…”

Current status and future development of solvent-based carbon capture

“…These drawbacks of MEA has been addressed through development of new solvents which include mixed amine solvents such as mixtures of MEA and MDEA, AMP and PZ among others (Dubois and Thomas 2012), ammoniabased solvents (Darde et al 2010), amino acid solvent (Brouwer et al 2005), biphasic solvents (Raynal et al 2011) and ionic liquid-based solvents (Boot-Handford et al 2014;Zacchello et al 2016). The new solvents have shown great potential.…”

Comparative Analyses of Primary and Secondary Amines for CO2 Chemical Process Capture in a CFBC Pilot Installation

“…The studies in the specialized literature [2]- [4] do not deal with the optimization of all parameters within the chemical absorption processes; they focus only on certain local parameters specific to the absorption and desorption units (temperature, pressure, flow). For example, in the study carried out in HYSYS 3.2 on the simulation of the chemical absorption process using equal blends of MDEA and DEA (20% MDEA, 20 % DEA and 60 % H 2 O), obtained an energy consumption of 2.3 GJ/ton CO 2 for a CO 2 capture efficiency of 80%; a quantity of required energy of 2.4 GJ/ton CO 2 for a CO 2 capture efficiency of 85%; a quantity of required energy of 2.7 GJ/ton CO 2 for a CO 2 capture efficiency of 90%; and of 2.95 GJ/ton CO 2 for a CO 2 capture efficiency of 95%.…”