Publication:
Aqueous Potassium salt of L-Cysteine as potential CO₂ removal solvent: an investigation on physicochemical properties and CO₂ loading capacity
Aqueous Potassium salt of L-Cysteine as potential CO₂ removal solvent: an investigation on physicochemical properties and CO₂ loading capacity
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Date
2023
Authors
Tengku Nur Adibah Tengku Hassan
Azmi Mohd Shariff
Nor Faiqa Abd Aziz
Nur Farhana Ajua Mustafa
Lian See Tan
Hairul Nazirah Abdul Halim
Mustakimah Mohamed
Heri Hermansyah
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Publisher
MDPI
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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).
Description
Keywords
L-cysteine (K-CYS),
Absorption,
Amino acid salts,
Sterically hindered amino acids (SHAA)