Ethanol Antoine vapor pressure

Table 13-1, based on the binary-system activity-coefficient-eqnation forms given in Table 13-3. Consistent Antoine vapor-pressure constants and liquid molar volumes are listed in Table 13-4. The Wilson equation is particularly useful for systems that are highly nonideal but do not undergo phase splitting, as exemplified by the ethanol-hexane system, whose activity coefficients are snown in Fig. 13-20. For systems such as this, in which activity coefficients in dilute regions may...

Use the Antoine equation to calculate the vapor pressure of ethanol at 50°C, and compare with the experimental value. 

Determine the number of theoretical stages required and the optimum stage locations for the feed and liquid side stream for the distillation process shown below assuming that methanol (M) and ethanol (JB) form an ideal solution. Use the Antoine equation for vapor pressures. 

From Antoine s equation, we first calculate the vapor pressure of ethanol from which we can then derive its initial mole fraction in the vapor phase (at 25 C) ... 

The vapor pressure of ethanol can be accurately estimated by Antoine s equation,... 

Calculate the percentages of methanol and ethanol removed from 200 g feed, when 10 g of the distillate is withdrawn. For the calculation the modified UNIFAC method should be applied. The constants for the Antoine equation for ethanol and water can directly be taken from Figure 5.30. For methanol the vapor pressure constants and the molar mass are given in Appendix A. For the calculation ideal vapor phase behavior should be assumed. 

P5.1 Calculate the pressure and the vapor phase mole fraction for the system ethanol (l)-water (2) at 70"C with the help of the different g -models (Wilson, NRTL, UNIQUAC) for an ethanol mole fraction of X =0.252 using the interaction parameters, auxiliary parameters, and Antoine constants given in Figure 5.30 and assuming ideal vapor phase behavior. Besides total and partial pressures and vapor phase composition, calculate also K-factors and separation factors. Repeat the calculation using the quantities defined in Eq. (5.15) = 0.9958 and i = 1.0070. 

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