Volumetric Properties of Binary Liquid Mixtures of Water with N-Methylpyrrolidone at (278.15–323.15) K and up to 70 MPa

Abstract

In the present paper, the density of the water–N-methylpyrrolidone mixture was measured over the entire concentration range of the liquid state of the mixture in the range of 0.1 to 70 MPa at five different temperatures from 278.15 to 323.15 K. The data obtained were used to calculate the excess molar volumes and excess partial molar volumes of water and N-methylpyrrolidone. Limiting values of partial molar volumes and excess partial molar volumes of N-methylpyrrolidone were determined at selected temperatures and pressures. The volume characteristics of aqueous solutions of 2-pyrrolidone and N-methylpyrrolidone were compared. Changes in the volumetric properties of solutions at various state parameters were considered in relation to their structural features.

Application of CP-PC-SAFT and PC-SAFT for Simultaneous Prediction of LLE and High-Pressure VLE with Universal k12 Values in Systems of Gases and n-Alkanes with N-Methyl-2-pyrrolidone and Some Substituted Aromatic Compounds

“…At the same time, PC-SAFT parametrized by Razavi et al and Alcalde et al has the best overall agreement with most reported data. The densities of NMP were reported in the relatively wide temperature and pressure range. − Figure A demonstrates that PC-SAFT of Alcalde et al yields particularly poor estimations of these data. Such a result is not surprising given its parametrization at the literature values of T c and P c values.…”

“…Densities (A) and sound velocities (B) in pure NMP. Pointsexperimental data. − , Solid linespredictions of CP-PC-SAFT, dashed linespredictions of PC-SAFT parametrized by van Niekerk et al, dotted–dashed linespredictions of PC-SAFT parametrized by Razavi et al, and dotted–dotted–dashed linespredictions of PC-SAFT parametrized by Alcalde et al …”

“…Figure 2. Densities (A) and sound velocities (B) in pure NMP.Points�experimental data [63][64][65]44 dotted−dashed lines�predictions of PC-SAFT parametrized by Razavi et al,45 and dotted−dotted−dashed lines� predictions of PC-SAFT parametrized by Alcalde et al5 …”

Preferential Solvation Phenomena as Solute-Induced Structure-Making/Breaking Processes: Linking Thermodynamic Preferential Interaction Parameters to Fundamental Structure Making/Breaking Functions

“…The effect of a third species (aka cosolvent, cosolute, osmolyte, denaturant, and stabilizer) on the solubility of a solute and the diffusive stability of the solvating environment has been the focus of great interest for the understanding of the thermodynamics of protein denaturation under normal state conditions, − the solubility enhancement of low-solubility species in highly compressible environments, − and the manipulation of the relative volatility of species to improve separations. , Typically, mixed-solvent systems combine the contrasting solvating behavior of the individual species, which results in significant deviations from solution ideality. In fact, the thermodynamic properties of aqueous organic mixed-solvent environments often exhibit complex behaviors including extrema and inflections points in their composition dependence. − While large thermodynamic nonidealities are notoriously difficult to describe accurately, this behavior actually becomes the major appeal of mixed-solvents as solvating environments in that the individual solvating capabilities can potentially complement each other.…”