Influence of five protic and aprotic ionic liquids as anti-crystallization additives of water/lithium bromide on the solid–liquid equilibrium

Autor segons l'article: Latorre-Arca D; Larrechi MS; Salavera D; Coronas A

Departament: Enginyeria Mecànica

Autor/s de la URV: Coronas Salcedo, Alberto / Larrechi García, Maria Soledad / Salavera Muñoz, Daniel

Paraules clau: Absorption refrigeration; Ionic liquids; Solid–liquid equilibrium; Spectroscopic analysis; Water/lithium bromide

Resum: In this work, we study the influence of five ionic liquids (ILs) as anti-crystallization additives of water/lithium bromide (H2O/LiBr) on the solubility of LiBr in H2O. The selected ILs are ethylammonium nitrate [EA][NO3], propylammonium nitrate [PA][NO3], ethylammonium chloride [EA][Cl], 1-butyl-3-methylimidazolium bromide [Bmim][Br], and 1,3-dimethylimidazolium chloride [Dmim][Cl]. The solubility of LiBr in H2O in the presence of these ILs was individually determined from (280–360) K at an IL/LiBr mole ratio around 0.0205, and at two additional IL/LiBr mole ratios in the case of ILs based on the imidazolium cation. A quantitative analysis of bulk water in H2O/(LiBr+IL) mixtures was conducted using near-infrared spectroscopy and multivariate curve resolution. The amount of H2O that does not interact with the solute (LiBr+IL), which is a measure of solute–solvent interactions, was estimated at 293.2 K, 313.2 K, and 333.2 K. In these solutions, in addition to the IL/LiBr mole ratio at 0.0205, two higher ratios were considered in the case of the mixture with [Dmim][Cl]. The results show that, on average, the selected ILs increase the solubility of LiBr in H2O from 1.6 % to 5.7 %, and that this increment is more pronounced at lower temperatures. Protic ILs based on the ammonium cation enhance the solubility of LiBr more than aprotic ones based on the imidazolium cation, following the order: [EA][NO3] ≈ [PA][NO3] > [EA][Cl] ≈ [Bmim][Br] ≈ [Dmim][Cl]. Furthermore, the presence of ILs contributes to a higher amount of bulk water, which suggests that ILs interact with LiBr ions, competing with H2O and favoring solubility. This interaction depends on both the chemical structure of the ILs, with protic ILs forming stronger bonds due to hydrogen bonding, and on the temperature, as the amount of bulk water decreases with an increase in temperature.

Àrees temàtiques: Astronomia / física; Atomic and molecular physics, and optics; Biotecnología; Chemistry, physical; Ciência de alimentos; Ciências biológicas i; Ciências biológicas ii; Ciências biológicas iii; Condensed matter physics; Electronic, optical and magnetic materials; Engenharias ii; Engenharias iii; Farmacia; Interdisciplinar; Materiais; Materials chemistry; Medicina ii; Physical and theoretical chemistry; Physics, atomic, molecular & chemical; Química; Spectroscopy

Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/

Adreça de correu electrònic de l'autor: alberto.coronas@urv.cat; daniel.salavera@urv.cat

Data d'alta del registre: 2026-02-13

Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion

Enllaç font original: https://www.sciencedirect.com/science/article/pii/S0167732225004696?via%3Dihub

Referència a l'article segons font original: Journal Of Molecular Liquids. 427

Referència de l'ítem segons les normes APA: Latorre-Arca D; Larrechi MS; Salavera D; Coronas A (2025). Influence of five protic and aprotic ionic liquids as anti-crystallization additives of water/lithium bromide on the solid–liquid equilibrium. Journal Of Molecular Liquids, 427(), -. DOI: 10.1016/j.molliq.2025.127302

URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/

DOI de l'article: 10.1016/j.molliq.2025.127302

Entitat: Universitat Rovira i Virgili

Any de publicació de la revista: 2025-06-01

Tipus de publicació: Journal Publications