Novel biphasic amino-functionalized ionic liquid solvent for CO2 capture: kinetics and regeneration heat duty

Amino-functionalized ionic liquid biphasic solvents present excellent absorption capacity, regeneration ability, and energy consumption savings, which make them a possible candidate for CO2 capture. The kinetics and regeneration heat duty of the [TETAH][Lys]-ethanol-water system capturing CO2 were investigated in this work. The mass transfer and kinetic parameters, including the overall reaction rate constant (kov), the reaction rate constant (k2), and the enhancement factor (E), were assessed at diverse concentrations and temperatures. At 303.15 K, the k2 of CO2 capture into the [TETAH][Lys]-ethanol-water solution was 58,907.30 m3 kmol−1 s−1. The Arrhenius equation was introduced to evaluate the relations between k2 and the reaction temperature, which can be presented as k2,TETAHLys‐ethanol‐water=1.9941×1015exp−7388.1T\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {k}_{2,\left[\mathrm{TETAH}\right]\left[\mathrm{Lys}\right]\hbox{-} \mathrm{ethanol}\hbox{-} \mathrm{water}}=1.9941\times {10}^{15}\exp \left(-\frac{7388.1}{T}\right) $$\end{document} The regeneration heat duty of the novel biphasic solvent was 35.5 and 62.39% lower than those of [TETAH][Lys]-water and the benchmark monoethanolamine solution, respectively. An efficient absorption performance and lower energy requirement indicate the great potential for this application.