Low-Viscosity Triethylbutylammonium Acetate as a Task-Specific Ionic Liquid for Reversible CO₂ Absorption

Abstract

Capturing and storing carbon dioxide (CO2) is now of concern. This work presents a task-specific ionic liquid (TSIL), triethylbutylammonium acetate ([N2224][CH3COO]), for the purpose of trapping CO2 instead of the commonly used organic amine solutions. Since [N2224][CH3COO] has a hydrophilic nature, the CO2 dissolution behavior into [N2224][CH3COO]−nH2O complexes has been investigated in detail, including the absorption rate, absorption capacity, and the ability of repeating absorption. The solubilities of CO2 into [N2224][CH3COO]−1H2O at 0 °C, 25 °C, 40 °C, and 60 °C from (0.007 up to 30) bar are presented. The results show strong evidence that [N2224][CH3COO]−1H2O is an excellent reversible absorbent for CO2, and the recovered [N2224][CH3COO]−1H2O maintains the same absorption capacity and absorption rate. The CO2 absorption into [N2224][CH3COO]−nH2O mixtures at 25 °C and pressures up to 30 bar is also studied. It is elucidated that the absorption capacity decreases with the content of water and the rise of operational temperature. The equilibrium constant, Henry’s law constant, overall rate constant, and activation energy are also calculated from the experimental data. All evidence indicates that [N2224][CH3COO]−nH2O with low viscosity may have potential to be used as good absorbents for CO2 capture.

Carbon dioxide uptake from natural gas by binary ionic liquid–water mixtures

“…43 The authors concluded that "the overall tendency is that adding a certain amount of water into the pure ionic liquids will slightly decrease the absorption capacity of CO 2 , but the lower viscosity of the mixture is favourable as it can promote gas diffusion in the solvent and reduce operational constrains on the use of ionic liquids fluids". 62,64 Of the multitude of papers on carbon dioxide solubility in ionic liquids, those that mention water content, with very few exceptions, state that the ionic liquids must be as dry as possible. 62,64 Of the multitude of papers on carbon dioxide solubility in ionic liquids, those that mention water content, with very few exceptions, state that the ionic liquids must be as dry as possible.…”

Solubilities of carbon dioxide in the eutectic mixture of levulinic acid (or furfuryl alcohol) and choline chloride

“…Ionic liquids (ILs) are extensively reported as a kind of new and ''promising'' absorbent for CO 2 in the past two decades due to their unique properties, such as high thermal stability, extremely low volatility, diversity, and tuneable properties [9][10][11]. However, ionic liquids still have several shortcomings including high price, complicated technology for production and purification, uncertain toxicity and poor biodegradability [12].…”

The use of zeolite, active carbon, and clove oil in closed transportation of giant freshwater prawn juvenile

“…es batu pada kotak styrofoam untuk menjaga suhu media tetap stabil pada suhu rendah. Peningkatan suhu menyebabkan peningkatan viskositas dan juga menyebabkan penurunan kelarutan gas dalam air, misalnya gas O 2 , CO 2 , N 2 , dan CH 4 (Goodrich et al, 2011;Wang et al, 2011;Nishizaki & Carrington, 2014 …”