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(Vapour+liquid) equilibria of {x CH3Cl+(1−x) CH3F} at temperatures of 159.01 K and 182.33 K

2003; Elsevier BV; Volume: 35; Issue: 7 Linguagem: Inglês

10.1016/s0021-9614(03)00080-6

1096-3626

A.M.P. Senra, I.M.A. Fonseca, L.Q. Lobo,

Thermodynamic properties of mixtures

Abstract The total vapour pressure of (CH 3 F + CH 3 Cl) was measured as a function of composition at temperatures of (159.01 and 182.33) K using the static method. These data were used to evaluate the molar excess Gibbs free energy G E m of the system at the same temperatures giving G E m ( x =0.50, T =159.01 K)=149 J · mol −1 and G E m ( x =0.50, T =182.33 K)=175 J · mol −1 . No azeotrope was found at both temperatures. The molar excess enthalpy for the equimolar mixture estimated from the G E m values is low and slightly negative: H E m ( x =0.50)=−29 J · mol −1 .