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.
Highlights
In the current years, research on using amino acid saltbased solvents as another alternative has been centred for carbon dioxide separation related technology
International Journal of Chemical Engineering high resistance to thermal and oxidative degradation as well as low in volatility for they are naturally ionic compounds, potentially are a greener solvent for capturing carbon dioxide [4, 5]. eir application shall result in a much cleaner and environmentally friendly process. Few studies on these systems are presently available in the literature. Majority of these already scant works are oriented toward the provision of precursor vapour-liquid equilibrium (VLE) data for studies, pertaining to kinetics and transport property-based investigations. e VLE data form the base for all design and simulation studies, which eventually leads to proper equipment sizing and better selection of operational parameters, resulting in optimal production
The VLE data of carbon dioxide-loaded aqueous solutions of potassium salt of L-histidine were measured using the HP-VLE apparatus. e experimental study was performed for a wide range of process parameters. e experimental results show that the HisK solutions exhibited high absorption capacity of carbon dioxide, with intrinsic advantages of being negligibly volatile, resistant to degradation, and environmentally friendly
Summary
L-threonine L-aspraginate L-glutamate L-amino-butyric acid L-sarcosine L-phenyl alanine. Source [7] [8] [9] [10] [11] [12] [13] [8] [9] [14] [15] [16] [17] [18] [19] [20] [8] [21] [22] [23] [22] [24] [25] [26] [23] [27] [27] [28] [19] [29]
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