Excess Volumes of Mixtures Containing Polar Liquids

Abstract

Excess volumes were measured for five binary polar liquid mixtures using pycnometers. The results were compared with predictions made using a partition function developed earlier. Good comparisons are achieved if the arithmetic-mean unlike diameter of interaction is adjusted with a single, composition-independent parameter.A partition function for mixtures containing polar liquids was recently reported (Winnick, 1973). It was shown to give reasonably good representations of the excess enthalpy for several polar-polar and polar-nonpolar systems, utilizing only one empirical parameter, the correction to the unlike energy of interaction. The excess volumes predicted were, however, not generally in quantitative agreement.Buff and Schindler (1958) and more recently Soares, et al. (1972), have utilized a second empirical correction to the arithmetic-mean unlike diameterwith some success for simple nonpolar liquid mixtures. This same approach was thus tested for the mixtures treated with the polar fluid partition function (Winnick, 1973).

Thermodynamic properties of { C2H5OH+(1− )H2O} in the temperature range from 320 K to 420 K at pressures up to 200 MPa

“…(1) at x = (0.2464 to 0.2469); R, Mertl (5) at x = (0.2300 to 0.2520); R, Linderstro m-Lang and Vaslow (6) at x = 0.2561; t, Dornte (7) at x = 0.2515; +, Udovenko and Fatkulina (8) at x = (0.2460 to 0.2670); T, Kurihara et al (10) at x = (0.2506 to 0.2606); r, Griswold et al (13) at x = (0.2370 to 0.2650); w, Barr-David and Dodge (14) at x = (0.2140 to 0.2640). (28) at T = 323.137 K; r, Winnick and Kong (34) at T = 323.137 K; r, Marsh and Richards (35) at T = 328.136 K; q, Westmeier …”

“…(28)(29)(30)(31)(32) The excess molar volumes at, or near, atmospheric pressure have been reported at temperatures between 273 K and 373 K in five papers. (33)(34)(35)(36)(37) The pressure dependence of the excess molar volume has been reported at temperatures a To whom correspondence should be addressed.…”

Separation of Cenospheres from Lignite Fly Ash Using Acetone–Water Mixture

“…The acetone (RCI Labscan Limited, 99.5%)-water mixture was prepared by mixing in different proportions, and the liquid contents were varied in terms of the acetone/water ratio as follows: 100:0, 80:20: 50:50, 20:80, and 0:100% v/v. When water is mixed with acetone at different volume percentages, basically the density of the mixture decreases from 1.00 g/cc based upon the principle of an acetone-water mixture that behaves as a non-ideal solution [38]. The extent of the density decrease is directly dependent on the volume percent of acetone added in the mixture.…”

Determination of the Critical Exponent δ for a Binary Mixture Using a Centrifugal Field

“…A standard pycnometric technique was used ( 16). The densities at 29°C of three samples of known mole fraction, in addition to the pure components, were found.…”

“…The density of the mixture, p, inEquation 9 was calculated using the experimental excess volume rçsults.Solution ofEquation 9 requires values for χ and η as f(r). Since these are not known precisely at any r, values must be guessed and an integration of Equation16 performed across the cell. In practice initial guesses were made at both sides of the meniscus.…”