Vapor—liquid equilibrium measurements for the n-pentane—methanol system at 372.7, 397.7 and 422.6 K
1987; Elsevier BV; Volume: 33; Issue: 1-2 Linguagem: Inglês
10.1016/0378-3812(87)87009-7
ISSN1879-0224
AutoresRichard A. Wilsak, Scott W. Campbell, George Thodos,
Tópico(s)Chemical Thermodynamics and Molecular Structure
ResumoP-x-y measurements have been obtained for the n-pentane—methanol system along the 372.7, 397.7 and 422.6 K isotherms. For these isotherms, this system exhibited maximum pressure azeotropic behavior. No other isothermal vapor—liquid equilibrium information exists in the literature for this sytem. The experimental data were correlated with the four-suffix Margules equation. The temperature dependence of the three parameters of this Margules equation was established for temperatures ranging from 372.7 to 422.6 K. However, attempts to extrapolate these relationships to lower temperatures, using excess enthalpy data available in the literature, proved inadequate for the prediction of the isobaric vapor—liquid equilibrium measurements of Tenn and Missen (1963). Auxiliary expressions have been developed relating azeotropic pressure and composition to temperature. These expressions are valid for temperatures ranging from 303.25 to 422.6 K.
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