Thermodynamic study of mixtures containing dibromomethane: Excess and solvation Gibbs energies

Matteoli, Enrico

First

Member of the Collaboration Group

;LEPORI, LUCIANO

Second

Member of the Collaboration Group

;Porcedda, Silvia

Last

Member of the Collaboration Group

2018-01-01

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Abstract

Isothermal vapor–liquid equilibria at 298.15 K for dibromomethane + an organic compound (C5–C8 n-alkanes, cyclohexane, tetrachloromethane, diethyl ether, dipropyl ether, dibutyl ether, tetrahydrofuran, and 3-pentanone) were determined by head-space gas chromatographic analysis of the vapor phase. Excess molar Gibbs energies, GE, and activity coefficients for the investigated systems were obtained by a least-square treatment of equilibrium data. All systems except mixtures with tetrahydrofuran and 3-pentanone revealed positive deviations from ideality. The Gibbs energies of solvation, ΔsolvG°, for the examined substances in dibromomethane were evaluated and compared with those in dichlorometane. The effect of polar groups, chain lengthening, and cyclization upon ΔsolvG° was discussed.