Bench-Scale Absorption Testing of Aqueous Potassium Lysinate as a New Solvent for CO2 Capture in Natural Gas-Fired Power Plants

Density and Viscosity Measurements and Modeling of CO2-Loaded and Unloaded Aqueous Solutions of Potassium Lysinate

“…Table 1 reports, in chronological order, the experimental works on aqueous LysK density and viscosity that have been published so far, specifying solvent concentration, investigated temperature range and the eventual CO2 loading of the solvent. 10 . Moreover, this article also aims at proposing and calibrating new semi-empirical correlations for density and viscosity, based on the new data collected.…”

“…The procedure used to estimate the uncertainty on LysK concentration is explained in paragraph 1 of the Supporting Information (SI) file. 10 . The explored temperature and loading ranges reflect the conditions envisaged during the capture processes (avoiding the region in which solid precipitation may occur),in the absorber 2 .…”

“…At a concentration level of 43.7% mass fraction (4.21 m), LysK is expected to guarantee the same absorption capacity to that of 30% w/w MEA (benchmark solvent), and its fast kinetic when reacting with CO2 may reduce packing requirements 10 of the related absorption unit. The maximum CO2 loading capacity and reaction kinetics of CO2 absorption in LysK solutions, assessed through vapour-liquid equilibrium 8,11 and bench-scale absorption tests 10 , seem to outperform MEA. Despite this, there are still many open items like corrosion, thermal degradation, toxicity of relative by products and regeneration energy, which can represent a limitation to the use of AAS in CO2 capture application via chemical absorption.…”

“…Specifically, potassium lysinate (LysK) is indicated in the literature as one of the most promising amino acid solutions. − At a concentration level of 43.7% mass fraction (4.21 mol LysK /kg H 2 O ), LysK is expected to guarantee the same absorption capacity to that of 30% MEA mass fraction in the aqueous solution (benchmark solvent), and its fast kinetic when reacting with CO 2 may reduce packing requirements of the related absorption unit. The maximum CO 2 loading capacity and reaction kinetics of CO 2 absorption in LysK solutions, assessed through vapor–liquid equilibrium , and bench-scale absorption tests, seem to outperform MEA.…”

“…The objective of this work is to provide new experimental data regarding thermophysical properties of CO 2 -loaded LysK solutions such as viscosity and density, covering a CO 2 loading range of around 0.3–1 mol CO 2 /mol LysK and a wide LysK concentration range of 2.16–4.44 mol LysK /kg H 2 O referred to as a range of interest in previous studies . Moreover, this article also aims at proposing and calibrating new semiempirical correlations for density and viscosity based on the new data collected.…”