Densities and volumetric properties of a (xylene + dimethyl sulfoxide) at temperature from (293.15 to 353.15) K
Introduction
The excess volumes of the investigated liquids and their mixtures are required, for instance, for relating excess enthalpy and excess Gibbs free energy values. From a practical point of view, the data are useful for the design of mixing, storage, and process equipment.
Research activities of our laboratory are the systematic measurement of volumetric properties of different groups of organic compounds. The aim of our new project is to prepare a database for testing the theories of liquid state, and devoted to the systematic study of liquid systems containing aromatic hydrocarbons with respect to their environmental importance.
Therefore, as a first step, the temperature dependence of excess molar volumes VmE for binary liquid mixtures containing dimethyl sulfoxide and xylene were measured with a vibrating-tube densimeter between T=293.15 K and 353.15 K at atmospheric pressure.
In this paper, we present the densities and excess molar volumes for (dimethyl sulfoxide + o-xylene, or m-xylene, p-xylene) at atmospheric pressure and T=(293.15, 303.15, 313.15, 323.15, 333.15, 343.15, 353.15) K. The aim of this work is to provide a set of data in order to assess the influence of the temperature on the molecular interactions between xylene and dimethyl sulfoxide. We have not found any reported mixing properties of these systems at these temperatures.
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Materials
The dimethyl sulfoxide (DMSO) used in the experiments was the product from Shanghai Chemicals Factory: A.R., g.c. mass fraction >0.997. o-Xylene; m-xylene; p-xylene by came from Tianjin Chemical Factory: o-xylene, A.R., g.c. mass fraction >0.997; m-xylene, A.R., g.c. mass fraction >0.98; p-xylene Materials, A.R., g.c. mass fraction >0.99; The method of purification has been described elsewhere [1]. All the chemicals were kept under 0.4 run molecular sieves for 1 week to remove any trace of
Results
The excess molar volumes VmE over the entire composition range for binary mixtures of x(CH3)2C6H4 + (1−x)DMSO were calculated from density data at the temperature between 293.15 K and 353.15 K and atmospheric pressure.
The results are summarized in TABLE 2, TABLE 3, TABLE 4, graphically presented in FIGURE 1, FIGURE 2, FIGURE 3. The experimental results for all systems were fitted by the method of least squares with all points weighted equally to the Redlich–Kister polynomial equation (3):
Discussion
It can be observed from the experimental results in TABLE 2, TABLE 3, TABLE 4 and FIGURE 1, FIGURE 2, FIGURE 3 that VmE curves are shifted in a regular way with increasing temperature. In all cases, for each system, the VmE over the whole mole fraction range is obviously increasing with increasing temperature from (293.15 to 313.15) K. The reasonable explanation for the fact is as follows. Dimethyl sulfoxide is a polar molecule, xylene is a non-polar molecule. The mixtures formed by dimethyl
Conclusion
We have measured liquid densities for (o-xylene + dimethyl sulfoxide), (m-xylene + dimethyl sulfoxide), (p-xylene + dimethyl sulfoxide) binary systems using a vibrating densimeter. We have calculated the excess molar volume using a Redlich–Kister type equation. Also we have calculated excess partial molar volume and partial molar volumes of each component. The new measurements can facilitate understanding of interactive behaviour between strongly polar substances and non-polar components.
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Present address: Department of Chemistry, Shaoxing College of Arts and Sciences, Shaoxing, Zhejiang 312000, PR China.