Kinematic viscosity studies of the binary ethane‐ 1,2‐diol/ n, n‐dimethylformamide solvent system at various temperatures

Abstract

Kinematic viscosity data (v) are presented for ethane-I ,2-diol, for N,N-dimethylformamide and for nine binary mixtures in the -10°C to 80°C temperature range. The experimental data were fitted by several empirical relations such as Grunberg-Nissan (1949), McAllister (19601, Heric (1966), Lobe (1973), Auslander (1964 and polynomial equations. Some considerations regarding the meaning of the obtained adjustment parameters are made. Furthermore. a new best fit equation is proposed and its validity has been compared to that of the other relations on the basis of the reproducibility of the experimental data. _ _ ~~~~On prCsente des donnCes de viscositk cinkmatique (v) pour I'ethane-1, 2-dio1, le N, N-dimCthylformamide ainsi que pour neuf mClanges binaires dans une gamme de temperatures de -10 h 80°C. Les donnies expCrimentales ont it6 cakes a I'aide de plusieurs relations empiriques telles que celles de Grunberg-Nissan (1949), McAllister (1960. Heric (1966), Lobe (1973), Auslander (1964) et par des Cquations polynbmiales. Certaines considerations concernant la signification des parambtres de calage obtenus sont prksentees. En outre, on propose une meilleure Cquation de calage dont la validit6 est comparke i celle des autres relations par rapport h la reproducibiliti des donnCes exptrimentales.

Electrical Conductivity and Solubility of KF in N,N-Dimethylformamide up to 125 °C

“…The specific conductivities of pure DMF and KF solutions of concentration (0.0768, 0.151, and 0.251) × 10 -3 mol‚dm -3 at 25 °C and a saturated solution in the (25-125) °C range are shown in Figure 4. The molar concentrations at temperatures other than 25 °C were calculated using the density of the solvent reported in the literature 7 up to 80 °C and linearly extrapolated up to 125 °C. The properties of DMF used in this work are presented in Table 1 as a function of temperature.…”

“…It should, however, be noted that the molarity of the solution changed during heating due to the thermal expansion of the solvent. From the known initial concentration and the density of DMF at the working temperature 7 it was possible to calculate the KF molarity at each temperature. After the measurement was completed, the procedure was repeated.…”

Viscosimetric studies on 2‐methoxyethanol + 1,2‐dimethoxyethane binary mixtures from −10 to 80°c

“…Furthermore, the parameters yi. are only slightly affected by temperature variations, while this is not the case for the equations of McAllister and Heric (Corradini et al, 1993). The quality of this model, Equation (4), to correlate the data is clearly shown by an average deviation AP!…”

“…The trend as is shown in Figure 2 was not linear, and it may be conveniently represented by an equation of the type (Corradini et al, 1993):…”

“…The usehlness of equation based on theory rather than linear polynomials for experimental data fitting has been extensively discussed in the literature by many authors (King et al, 1979;Kolling, 1985). Therefore, starting from Auslander's approach (Auslander, 1964), and following the elegant theory provided by King and Queen (1 979), it was proposed in an earlier paper to use Equation (4) for interpolation of the binary data (Corradini et al, 1993). However, the most important feature of this relationship resides in the fact that it contains only two empirical coefficients (y,) representing two cross-interaction terms related to the specific intermolecular interactions, maintaining coherence with the two adjustment parameters equations, such as those of McAllister (1960) and Heric (1966).…”