![]() ![]() Protic ionic liquids (PILs) are salts formed by a neutralization reaction described by the Brønsted–Lowry acid–base model, whereas aprotic ionic liquids (AILs) are salts that are formed following the Lewis model (Yoshizawa et al. Ionic liquids, according to Rogers and Seddon (2003), are chemical compounds that are liquids at temperatures below or around 373.15 K and are entirely formed by ions. Ionic liquids (ILs) have gained industrial and academic interest for their potential use as ecological solvents to replace traditional volatile solvents. The need for new, more environmentally friendly solvents to replace or reduce the use of popular solvents currently employed in the industry and academia is increasing. Enhancing the temperature leads to a decrease on density and sound velocity. Critical micellar concentrations at 298 K were determined through conductivity data. However, decreasing the dilution in water, the density, the conductivity and the speed of sound initially increase and then decrease, exhibiting a maximum in the initial water concentration range which indicates the formation of aggregates. The increase in the alkyl chain leads to a tendency to decrease the values of density, speed of sound, and conductivity of the solutions. Mathematical models were used for each ionic liquid + water mixture to fit the density and speed of sound data. The temperature range used for measurements was 293.15–323.15 K. ![]() The measured properties were density, speed of sound, and conductivity, and their isentropic compressibility and thermal expansion coefficient were calculated based on these properties. The objective of this study was to evaluate the properties of aqueous binary solutions for three different ionic liquids (ILs): dibutylammonium acetate, dibutylammonium propanoate, and dibutylammonium butanoate. These features make them flexible and tunable, indicating their possible use as substitutes for commonly used compounds in many processes. Ionic liquids are used in different processes owing to their low vapor pressure, large viscosity range, chemical and thermal stability, and superior conductance even without water. ![]()
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