The orthobaric coexisting densities of {xSi(CH3)4(1−x)C(CH3)4} fromT≈ 360 K up to the gas–liquid critical line: a possible experimental route for the verification of the Lorentz or arithmetic-mean combining rule for mixtures of quasi-spherical molecules
✍ Scribed by Juan-Manuel Barbarin-Castillo; Ian A. McLure
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 210 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0021-9614
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✦ Synopsis
The orthobaric densities of the liquid and vapour phases of tetramethylsilane q 2,2-. dimethylpropane have been measured with a hydrostatic density balance from a temperature Ž . of about 360 K up to near the gas q liquid critical locus. The results were used to test the applicability of the extended-scaling equation of Wegner to fit the densities of these mixtures along a single limb of the coexistence curve; the data were well represented using only two scaling correction terms. The observed critical temperatures show a linear composition dependence between the values for the pure substances, in good agreement with the Lorentz᎐Berthlot rules for mixtures of molecules of near-equal size and energy. A verification of these results is finally accompanied with a set of values for , , , and as obtained ii jj ii jj from the numerical technique of Rummens and Rajan. ᮊ 1997 Academic Press Limited KEYWORDS: near-critical; orthobaric densities; tetramethyls ij routes are somewhat extended to include the indirect determination of B ¨ia ij enthalpies Ž1. and volumes Ž2. of mixing of gases.