Density and Speed of Sound of Binary Mixtures of Ionic Liquid 1-Ethyl-3-methylimidazolium Tetrafluoroborate,N,N-Dimethylformamide, andN,N-Dimethylacetamide at Temperature Range of 293.15–343.15 K: Measurement and PC-SAFT Modeling

Abstract

Density, ρ, and speed of sound, u, were measured for two binary mixtures, 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + N,N-dimethylformamide (2) and 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + N,N-dimethylacetamide (2), over the entire range of compositions at T = 293.15–343.15 K in 5 K intervals using an Anton Paar density and sound velocity analyzer (DSA 5000). Also excess molar volume, V m E, isentropic compressibility, k s, and isentropic compressibility deviation, Δk s, were calculated. For these two binary mixtures, the V m E values were negative in x 1 = 0.1–0.8, they were positive in x 1 ≥ 0.8, and they became more negative with increase in the temperature from 293.15 to 343.15 K. For both systems, the most negative V m E values were observed in the region of x 1 = 0.5. The V m E values were fitted to the Redlich–Kister polynomial equation. The perturbed chain statistical associating fluid theory (PC-SAFT) was also employed in order to correlate the densities of the binary mixtures at the temperature range of 293.15–343.15 K. The results obtained were in good agreement with the experimental data.

Intermolecular Interactions between 1-Ethyl-3-methylimidazolium-Based Ionic Liquids with Carboxylic Acid at Different Temperatures via Thermodynamic and Spectroscopic Studies

“…The experimental density (ρ), sound velocity ( u ), refractive index ( n D ), and surface tension (γ) for pure liquids [EMIM] + [BF 4 ] − , [EMIM] + [MeSO 4 ] − , acetic acid, and propionic acid obtained in this work are listed in Table alongside the literature data ,,,− from previous work for comparison .…”

“…Measurements of the density and sound velocity for pure components and binary mixtures were recorded using an Anton Paar DSA-5000M densitometer and sound velocity analyzer with an uncertainty of 0.006 g•cm −3 and 1 m•s −1 , respectively. This equipment contains a temperature regulator that maintains the samples at a specific temperature with an uncertainty of 0.02 K. The instrument was calibrated by measuring distilled water followed by ethanol and lastly dry air 47 1640 47 1.413 50 54.01 52 1.297 48 1.407 48 52.05 53 303. 15 1.275 1.276 45 1618 1608 36 1.412 1.410 45 1.279 46 1609 44 1.413 49 1.278 47 1616 47 1.411 50 1.289 48 1.405 48 313.…”

“…This equipment contains a temperature regulator that maintains the samples at a specific temperature with an uncertainty of 0.02 K. The instrument was calibrated by measuring distilled water followed by ethanol and lastly dry air 47 1640 47 1.413 50 54.01 52 1.297 48 1.407 48 52.05 53 303. 15 1.275 1.276 45 1618 1608 36 1.412 1.410 45 1.279 46 1609 44 1.413 49 1.278 47 1616 47 1.411 50 1.289 48 1.405 48 313. 15 1.267 1.268 45 1595 1586 44 1.409 1.407 45 1.271 46 1593 47 1.410 49 1.271 47 1.408 50 1.282 48 1.403 48 323.…”

“…15 1.275 1.276 45 1618 1608 36 1.412 1.410 45 1.279 46 1609 44 1.413 49 1.278 47 1616 47 1.411 50 1.289 48 1.405 48 313. 15 1.267 1.268 45 1595 1586 44 1.409 1.407 45 1.271 46 1593 47 1.410 49 1.271 47 1.408 50 1.282 48 1.403 48 323. 15 1.260 1.261 45 1572 1563 44 1.407 1.406 45 1.264 46 1571 47 1.408 49 1.263 47 1.406 50 1.275 48 1.400 48 333.…”

Noninvasive Determination of the Amount of Ethanol in Liquid Mixtures by Ultrasound Using Bilinear Interpolation Method

“…Ultrasound technologies have become increasingly widespread in many areas. One of these is using ultrasonic velocity measurements to analyze the contents of the mixture [1][2][3][4][5][6][7]. The determination of the changes in the number of substances and the amount of each substance contained in the solution is of great importance to monitor the processes, analyze the solution, and determine the contents of foods or mixtures.…”