The n-Pentane-Acetone System

Experimental data are available for this system at three temperatures by Campbell et al. (1986). Interaction parameters were estimated by Englezos et al. (1993). It was found that the Trebble-Bishnoi EoS is able to represent the correct phase behavior with an accuracy that does not warrant subsequent use of ML 

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Figure 14.1 Vapor-liquid equilibrium data and calcidated values for the n-pentane-acetone system, x andy are the mole fractions in the liquid and vapor phase respectively [reproduced with permission from Canadian Journal of Chemical Engineering].

Campbell S.W., R.A. Wilsak and G. Thodos, "Isothermal Vapor-Liquid Equilibrium Measurements for the n-Pentane-Acetone System at 327.7, 397.7 and... 

If the correct phase behavior i.e. absence of erroneous liquid phase splits is predicted by the EoS then the overall fit should be examined and it should be judged whether it is "excellent". If the fit is simply acceptable rather than "excellent", then the previously computed LS parameter estimates should suffice. This was found to be the case for the n-pentane-acetone and the methane-acetone systems presented later in this chapter. 

P5.7 Calculate the VLE behavior, h data, azeotropic data, and activity coefficients at infinite dilution for the system n-pentane-acetone at 373 K. 398 K, and 423 K using modified UNIFAC. The results are shov n graphically in Figure 5.103. 

A solvent system that has proven versatile for the separation of more or less polar solutes in an unsaturated N-tank (Chapter 7) consists of hydrocarbon plus acetone plus chloroform. A typical example is hexane-acetone-chloroform (65 30 5). Pentane, isooctane, or toluene are other suitable hydrocarbons to replace hexane to improve selectivity. For very polar solutes, a small percentage of methanol is included, and a little acid or base is added to control ionization of acidic or basic solutes. The effect of the chloroform appears to be control of the evaporation rates of the various solvent components during the development-equilibrium process. 

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