VLE of Carbon Dioxide-Loaded Aqueous Potassium Salt of L-Histidine Solutions as a Green Solvent for Carbon Dioxide Capture: Experimental Data and Modelling

Abstract

In this study, vapour-liquid equilibrium of CO2-loaded aqueous potassium salt of L-histidine was studied for a wide range of temperature (313.15–353.15 K), pressure (150–4000 kPa), and solvent concentrations (1–2.5 molar). The experimental results show that L-histidine has an excellent absorptive capacity for carbon dioxide. When compared to conventional solvent (monoethanolamine) and amino acid salt (potassium L-lysinate) at similar process conditions, L-histidine has superior absorption capacity. Moreover, modified Kent–Eisenberg model was used to correlate the VLE of the studied system with excellent agreement between the model and experimental values. The model exhibited an AARE% of 7.87%, which shows that it can satisfactorily predict carbon dioxide solubilities in aqueous potassium salt of L-histidine at other process conditions. Being a biological component in origin, almost negligibly volatile, and highly resistant to oxidative degradation, L-histidine offers certain operational advantages over other solvents used and has a promising potential for carbon dioxide capture.

Hydrogenation of CO2 to formic acid in biphasic systems using aqueous solutions of amino acids as the product phase

“…[12,13] In search for biobased alternatives amino acids and their salts have been investigated. [14][15][16][17] Their applicability in reversible carbon capture has been demonstrated with higher reaction rates and CO 2 -loading for the respective potassium salts as compared to the neutral amino acids. [17][18][19] Scrubbing solutions based on amino acid salts were applied already at pilot plant scale in for the PostCap TM technology.…”

“…[14][15][16][17] Their applicability in reversible carbon capture has been demonstrated with higher reaction rates and CO 2 -loading for the respective potassium salts as compared to the neutral amino acids. [17][18][19] Scrubbing solutions based on amino acid salts were applied already at pilot plant scale in for the PostCap TM technology. [20] Formic acid has a number of applications in relation to biological processes e.g.…”

CO2 solubility modelling in Non-Precipitating aqueous solutions of potassium lysinate

“…The availability of reliable and accurate information on carbon dioxide equilibrium solubility in aqueous solutions of AAS is of paramount importance to proper design gas treating units. In this area, the literature offers a variety of works mainly based on Kent-Eisenberg (KE) correlation [12][13][14][15][16][17][18] , with ideal mixture assumption. This framework makes Kent-Eisenberg regressions unfit for extrapolation.…”