Phase Equilibria in the Systems Acetone–Methanol, Acetone–Cyclohexane, Methanol–Cyclohexane, and Acetone–Methanol–Cyclohexane

Abstract

The vapor pressure and vapor composition of the methanol-cyclohexane system were investigated at temperatures ranging from 25 to 50' . The same properties of the binary systems: acetone-methanol and acetone-cyclohexane, as well as those of the ternary system : methanol-cyclohexane-acetone, were determined experimentally at 25'. The total pressures and compositions of the vapor for solutions lying close to the critical solution temperature of the binary system or close to the plait point of the ternary system are constant within the range of experimental accuracy. All these systems show azeotropic behavior. The methanol-cyclohexane system has an equimolar excess Gibbs free energy, GE, at 25' of 384.7 cal/mol, while the corresponding equimolar value of GE for the acetone-methanol system at 25' is 102.6 and for the acetone-cyclohexane system, at 25", it is 274.5 cal/mol. La pression de vapeur et la composition de vapeur du systeme methanol-cyclohexane ont Cte ttudites sur une echelle de temperature allant de 25 A 50". Les m&mes proprietes des systtmes binaires: acetone-methanol et acetone-cyclohexane, ainsi que celles des systemes ternaires: methanol-cyclohexane-acetone, ont ete determinees experimentalement a 25". Les pressions totales et les compositions de la vapeur pour des solutions proches de la temperature critique de la solution du systtme binaire ou proches du point de plissement du systeme ternaire, sont constantes dans I'intervalle d'exactitude experimental. Tous ces systemes montrent un comportement azeotropique. Le systeme methanol-cyclohexane a un excts d'energie libre tquimolaire de Gibbs, GE, de 384.7 cal/mol a 25", alors que les valeurs tquimolaires correspondantes de GE pour le systtme acetone-methanol est de 102.6 a 25" et pour le systeme acetone-cyclohexane de 274.5 cal/mol a 25".

Calculation of alcohol‐acetone‐cellulose acetate ternary phase diagram and their relevance to membrane formation

“…From eq. (1), when φ 3 = 0, Flory–Huggins theory can be simplified to solvent–nonsolvent systems; the following expression would result: From the relation between the excess Gibbs energy ( G E ) and the Gibbs free energy of mixing for a two‐component system, the parameters can be calculated from literature data on G E 15–17 As shown in Table II, the g 12 of acetone with methanol, ethanol, and isopropanol was calculated from the G E , which was obtained from a vapor pressure experiment, and was related by the Wilson equation 18.…”

Influence of Solvent Composition on the Miscibility and Physical Stability of Naproxen/PVP K 25 Solid Dispersions Prepared by Cosolvent Spray-Drying

“…The methanol and acetone can interact through intermolecular hydrogen bonding as acetone is a weak proton acceptor. Thus, the binary mixtures of methanol with DCM and acetone show strong positive deviation from ideality (26,27). The formation of electron donor-acceptor complexes and the absence of association in the pure components, and thereby the negative deviation from ideality, have been documented for the DCM-acetone system throughout a broad composition range (28).…”

“…The methanol-acetone mixture is reported to form an azeotropic mixture at 88% w/w acetone content (27). The relative volatilities of acetone and DCM decrease with increasing amount in methanolic solutions.…”

Densities, Excess Volumes, Surface Tensions, Viscosities, and Dielectric Constants of the Systems: Methanol–Cyclohexane, Acetone–Methanol, Acetone–Cyclohexane, and Methanol–Cyclohexane–Acetone

“…This agrees with the observation ofcampbell and Kartzmark (13,14) that strong positive deviation from additivity in molar polarization is an indication of tendency towards formation of a miscibility gap. The statement of Campbell and Kartzmark received further support from the thermodynamic data as the activity coefficients of these systems show similar behavior (1).…”