Aqueous Potassium salt of L-Cysteine as potential CO₂ removal solvent: an investigation on physicochemical properties and CO₂ loading capacity
Journal
Sustainability
ISSN
2071-1050
Date Issued
2023
Author(s)
Tengku Nur Adibah Tengku Hassan
Azmi Mohd Shariff
Nor Faiqa Abd Aziz
Nur Farhana Ajua Mustafa
Lian See Tan
Mustakimah Mohamed
Heri Hermansyah
Universitas Indonesia
DOI
10.3390/su151511558
Handle (URI)
Abstract
The operational and economic constraints suffered by amine solvents for CO₂ removal have motivated the research on an alternative solvent with better performance and cost-effectiveness. Amino acid salt (AAS) has been identified as an interesting green solvent, an alternative to commercial amine solvents. The present work evaluated the physicochemical and CO₂-solubility properties of potassium L-cysteine (K-CYS), a naturally occurring amino-acid-based solvent for CO₂ removal from natural gas. Its physicochemical properties, including density, viscosity, and refractive index, were measured at different temperatures ranging between 298.15 and 333.15 K and a concentration range of 5 to 30 wt.%. Based on the experiment, all properties were found to decrease with increasing temperature and increase with increasing concentration. The experiments also demonstrated a significant reduction of CO₂ loading from 2.4190 to 1.1802 mol of CO2/mol of K-CYS with increasing solvent concentration from 10 to 30 wt% at 313.15 K and 20 bar (g).
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