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Thermodynamic and Physicochemical Properties of {Tricyanomethanide-Based IL + Ethanol} Solutions: Experimental Data and Correlations

Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Absorption refrigeration systems (ARS) commonly use the {lithium bromide + water} pair as a working fluid. However, this combination poses challenges, such as corrosion, crystallization, and environmental concerns due to lithium mining. Lithium’s growing demand, especially for batteries, has also led to high and sustained prices, making it imperative to find alternatives. This study explores ethanol as a circulating medium combined with ionic liquids (ILs): 1-ethyl-3-methylimidazolium tricyanomethanide ([C 1 C 2 IM][TCM]), 1-ethyl-1-methylpyrrolidinium tricyanomethanide ([C 1 C 2 PYR][TCM]), and 4-ethyl-4-methylmorpholinium tricyanomethanide ([C 1 C 2 MOR][TCM]). These ILs were thermodynamically and physicochemically characterized over a wide range of temperatures and compositions. Isothermal vapor–liquid equilibrium (VLE) was measured at pressures up to 90 kPa and temperatures between 328.15 and 348.15 K, with the Redlich–Kwong equation used for data correlation. Theoretical cycles were constructed by using experimental VLE data and literature values, and the performance (COP) of these IL-based fluids was compared with the {LiBr + water} system. The density and viscosity of binary solutions were measured across T = 293–338.15 K and correlated with empirical models. The study also details the synthesis, NMR analysis, and DSC characterization of [C 1 C 2 PYR][TCM] and [C 1 C 2 MOR][TCM], highlighting the influence of the IL structure on system performance. This research provides valuable insights into developing environmentally sustainable and efficient ARS alternatives.
DOI: 10.1021/acs.jced.4c00694
Language: English
Subfield: Catalysis
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4407764481
FWCI: 0.817
Cites: 74
Cited by: 6
Related to: 10