Evaluation of Methanesulfonate-Based Deep Eutectic Solvent for Ammonia Sorption

Abstract

The concept of eutectic solvents as a platform technology for a variety of applications including gas separation has become a popular approach. To date, the number of known deep eutectic solvents (DESs) is limited mainly to halide salts easily interacting with a hydrogen-bond donor (HBD) and resulting in the formation of a liquid phase. Actually, the DESs properties may be tuned by selecting the appropriate HBD, while the structure of the anion is not a decisive factor. However, the presence of other anions may be favorable for certain applications; therefore, expanding the range of deep eutectic solvents seems a relevant issue of chemistry and material science. In this study, we report the high absorption properties of the DES based on 1-butyl-3-methyl imidazolium methanesulfonate–urea toward ammonia. The structure features investigations have revealed the major contribution of C(2)-H to hydrogen bonding. To assess the possibility of selective separation, the solubility of ammonia and two acidic gases (H2S and CO2) in the absorbent has been measured. A superior gas sorption capacity was observed for ammonia, for which the Henry’s law constant was equal to 1.52 bar. The obtained results exceeded the solubility data reported in the literature for various ILs containing hydrogen-donating groups. The DESs demonstrated lower yet acceptable solubility toward hydrogen sulfide, whereas the solubility of CO2 was relatively poor. The thermostimulated desorption has demonstrated that the ability of gases to bind with DES molecules can be ranked as follows: NH3 > H2S > CO2. The physical sorption mechanism of ammonia, hydrogen sulfide, and carbon dioxide in the DES was proven by FTIR and thermal desorption analysis. The absorption was totally reversible, and the solubility of gases remains almost unchanged after three cycles.

Dual‐functionalized protic ionic liquids for efficient absorption of NH3 through synergistically physicochemical interaction

“…In order to evaluate the potential of DPILs for industrial applications of NH 3 absorption, the ILs and deep eutectic solvents (DESs) reported to absorb NH 3 were compared with this work, as shown in Table . The results indicated that the NH 3 solubility in [EtOHim][NTf 2 ] is over 30‐fold greater than that of [Emim][NTf 2 ], and four‐fold greater than that of the functionalized IL [EtOHmim][NTf 2 ], which is superior to any nonmetallic ILs reported so far.…”

Experimental Evaluation of the Efficiency of Membrane Cascades Type of “Continuous Membrane Column” in the Carbon Dioxide Capture Applications

“…The most promising alternative to the chemical absorption method are technological solutions based on the membrane gas separation method, since these processes are characterized by energy efficiency [7][8][9], ease of scaling, environmental friendliness, and the possibility of "tuning" the process by selecting the most efficient membranes and varying the configurations of membrane devices. Attracted by the economic and environmental advantages of membrane technology, many researchers [10][11][12][13] focused on two areas of investigation, the search and creation of new materials (membranes) [14][15][16][17][18][19] and the designing of new membrane processes and devices [20][21][22][23][24].…”

Promising Technological and Industrial Applications of Deep Eutectic Systems

“…Regarding the application of DESs to the sorption of ammonia, a consistent family of DESs has been developed in the last years. Akhmetshina et al reported a study on the gas sorbent properties of the DES 1-butyl-3-methyl imidazolium methanesulfonate/urea toward ammonia, hydrogen sulfide and carbon anhydride, with good results relative to the sorption capacity of the ammonia [ 98 ]. This study follows the results presented by Zhong [ 99 , 100 ] about phenol-based ternary DESs, by Yang using the hybrid DES choline chloride/resorcinol/glycerol (1:3:5) [ 101 ], Deng with protic NH 4 SCN-based DESs [ 102 ] and Vorotyntsev who employed methanesulfonate-based DESs.…”