Abstract
The CO2 absorption process using aqueous solutions of lysine (Lys), the ionic liquid (IL) tetrabutyl phosphonium lysinate ([TBP][Lys]) and their mixtures was studied by means of a packed tower. The performance of these systems was evaluated through the volumetric overall mass transfer coefficient ( K G a V ) , conducting experiments under diverse conditions such as inlet CO2 concentration from 10 to 40 vol.%, gas and absorbent flow rates from 100 to 200 mL/min and from 3 to 5 mL/min, respectively, absorbent concentration from 5 to 15 wt.% and temperature from 15 to 40 °C. The obtained results for all the previous experimental conditions were better for the IL/Lys mixture than for the isolated components; the best performance was shown by the experiment varying the absorbent concentration, where the increasing K G a V was benefited by the IL/Lys synergistic effect.
Highlights
In recent years, the increase in carbon dioxide (CO2 ) emissions has gained widespread attention, for it is a major contributor to global warming [1]
In our previous work [18], a study on CO2 batch sorption using amino-acid-based ionic liquid (IL) was conducted by varying cations such as tetra methyl ammonium (TMA) and tetra butyl phosphonium (TBP) and anions like glycine, alanine, valine, glutamine, histidine, arginine and lysine; the results show that the highest sorption capacity was achieved with TBP and lysine
The continuous CO2 absorption behavior in a packed column was carried out through the calculation of the global mass transfer coefficient using a specific task ionic liquid (IL) and its components in aqueous solution. This IL was dissolved in water, and its CO2 absorption behavior revealed that its mass transfer efficiency is proportional to its concentration
Summary
The increase in carbon dioxide (CO2 ) emissions has gained widespread attention, for it is a major contributor to global warming [1]. As an example of the direct use of CO2 , the enhanced oil recovery (EOR) process has been developed [4], and the manufacture of products with high industrial demand and added value such as dimethyl ether via CO2 hydrogenation [5] illustrates the case of CO2 catalytic transformation [6]. These two general lines profiting from CO2 capture enable the existence of circular economies by immobilizing and reducing the global concentration of this greenhouse gas. Some proposals have been developed to couple the production and distribution infrastructure of liquefied natural gas (LNG) with
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