Atmospheric densities and interfacial tensions for 1-alkanol (1-butanol to 1-octanol)+water and ether (MTBE, ETBE, DIPE, TAME and THP)+water demixed mixtures

Initial Interfacial Tension for Various Organic–Water Systems and Study of the Effect of Solute Concentration and Temperature

“…Moreover, saturated alkanes such as n-hexane and n-heptane also have interfacial tensions as 51.1 mN/m at 293.15 K and 50.2 at 298.15 K 1 , respectively. Also, Frietes et al27 have predicted the value of methylcyclohexane as 50.8 mN/m at 293.15 K while Apostoluk and Drzymala22 have predicted the value equal to 49.61 mN/m. As methylcyclohexane has only negligible solubility with water therefore the initial interfacial tension measured in this work may be regarded as the interfacial tension between the mutually saturated phases and should be a part of the interfacial tension database.…”

Porosimetric membrane characterization techniques: A review

“…In order to determine the interfacial tension, the spinning drop technique [118,120] was used for different mixtures of polyethylene glycol (PEG) and magnesium sulfate. Specifically, the spinning drop tensiometer technique allows for measuring the interfacial tension between two liquid phases by analyzing the dimensions of a drop in a rotating capillary by the Vonnegut method [124,125], and is a precise and simple measurement to determine extremely low interfacial tensions. Interfacial tension values for the ATPS samples of PEG1000 / MgSO4 / H2O at several mass proportions have been found to range from 0.1 to 1 mN/m, and the density difference between the two phases vary between 30 to 60 g/cm 3 at the temperature of 22 °C.…”

Liquid‐Liquid Equilibrium and Interfacial Properties of the System Water + Hexylacetate + 1‐Hexanol

“…Such a theoretical framework, which permits the calculation of the interfacial tension related to the LLE was established twenty years ago [7]. The basic idea of this approach is the applica-tion of the density gradient theory, originally developed by Van der Waals [8] and rediscovered by Cahn-Hilliard [9], to incompressible fluids, where the Helmholtz energy can be replaced by the Gibbs energy and consequently the thermodynamic properties can be modelled with a g E model rather than an equation of state [10,11] The method was used for different binary [12][13][14][15][16][17][18][19][20][21], ternary [14,21,[22][23][24][25][26] and quaternary mixtures [21,[27][28][29]. Recently, also the time-dependency of the interfacial tension caused by diffusion [14,16,24,27] or caused by a chemical reactions [21,29] were studied.…”

“…For the system under study only binary data belonging to the binary subsystems were measured , , . LLE data for the binary subsystems water + 1‐hexanol , , as well as for the binary subsystem water + hexylacetate , are available, this holds true also for interfacial tension data regarding the subsystems water + 1‐hexanol , , , and water + hexylacetate . Considering the ternary system water + 1‐hexanol + hexylacetate no experimental data, to the best of our knowledge, exists in open literature, regarding the LLE, as well as interfacial tension data at T = 298.15 K. Therefore, some experimental data with respect to the LLE and with respect to the interfacial tension were produced in order to verify or falsify the predictions.…”

“…For this propose a similar mixture is chosen, where the middle‐polar component 1‐butanol is replaced by 1‐hexanol having a lower polarity and to the same time the non‐polar component benzene is replaced by hexylacetate having a slightly higher polarity. For the system under study only binary data belonging to the binary subsystems were measured , , . LLE data for the binary subsystems water + 1‐hexanol , , as well as for the binary subsystem water + hexylacetate , are available, this holds true also for interfacial tension data regarding the subsystems water + 1‐hexanol , , , and water + hexylacetate .…”