Density, Viscosity, and Conductivity of Binary Mixtures of the Ionic Liquid N-(2-Hydroxyethyl)piperazinium Propionate with Water, Methanol, or Ethanol

Abstract

The densities, viscosities, and electrical conductivities of the binary systems of the ionic liquid), with three protic solvents (water, methanol, or ethanol) were measured in the IL concentration range from (0.05 to 3.00) mol•kg −1 at different temperatures T = (293.15 to 323.15) K and atmospheric pressure p = 0.1 MPa. The concentration dependences of apparent molar volume, viscosity, and electrical conductivity of the binary mixtures were correlated by the Pitzer equation, the Jones−Dole equation, and the Casteel−Amis equation, respectively. It is observed that both the density and viscosity increase with the elevated IL concentration or the decreased temperature. The electrical conductivity at a given IL concentration increases with the temperature, while the conductivity at a given temperature changes clearly against the IL concentration, and a maximum value can be observed. The measured results and the correlations present help for a better understanding and applications of the piperaziniumbased IL.

Physicochemical Properties of Various 2-Hydroxyethylammonium Sulfonate -Based Protic Ionic Liquids and Their Potential Application in Hydrodeoxygenation

“…All PILs were synthesized according to the same reaction mechanism, which was the neutralization reaction of Brønsted acids and Brønsted bases. Other references had reported the relevant synthesis procedures with similar structures (Xuedan Song et al, 2012; Cao et al, 2015; Hosseini et al, 2018), but the operation procedures were slightly different. The relevant structure of cations and anions of synthesized PILs are shown in Figure 1 and their description and abbreviation are presented in Table 1.…”

The peculiar effect of water on ionic liquids and deep eutectic solvents

“…The electrical conductivity of IL/DES-H 2 O systems generally shows a maximum value at a relatively low IL/DES concentration. 36 All these observations imply that IL/DES-H 2 O systems are unique compared with either organic solvent mixtures or aqueous electrolyte solutions. However, no attempts have been made to systematically assess the extent to which these systems differ from binary solvent mixtures or aqueous electrolyte solutions by comprehensively summarizing the available literature.…”

Ionic Liquid Analogs of AlCl3 with Urea Derivatives as Electrolytes for Aluminum Batteries

“…In organic electrolyte systems, conductivity maxima are frequently found at concentrations well below the solubility limit of the salt. Typically, a conductivity maximum is found around 1-2 M salt concentration [38][39][40] , for ions may tend to associate with one another at higher concentrations (ionicity decreases)…”