Acetone Antoine vapor pressure

The vapor pressures of acetone and methanol are given by Antoine equations ... 

Estimate the vapor pressure of acetone (mm Hg) at 50 C (a) from data in Perry s Chemical Engineers Handbook and the Clausius-Clapeyron equation, (b) from the Cox chart (Figure 6.1-4), and (c) from the Antoine equation using parameters from Table R4. 

The necessary vapor pressures and activity coefficients are supplied by data correlations. For the system acetone(l)/n-hexane(2), vapor pressures are given by Eq. (4-142), the Antoine equation ... 

Use the Clapeyron equation to estimate the vapor pressure of acetone at 0°C. (2) Use the Antoine equation to estimate the vapor pressure of acetone at 0°C. (3) If the vapor pressure of acetone is 71 mm Hg, calculate the maximum concentration (mole fraction) of acetone at 1 atm total pressure. 

The vapor pressure of acetone at 0°C predicted by the Antoine equation is... 

A distillation column is separating 100 mol/s of a 30 mol% acetone, 70 mol% methanol mixture at atmospheric pressure. The feed enters as a saturated liquid. The column has a total condenser and a partial reboiler. We desire a distillate with an acetone content of 72 mol%, and a bottoms product with 99.9 mol% methanol. A reflux ratio of 1.25 the minimum will be used. Calculate the number of ideal stages required and the optimum feed location. VLE for this system is described by the modified Raoult s law, with the NRTL equation for calculation of liquid-phase activity coefficients, and the Antoine equation for estimation of the vapor pressures. 

Note -35°C is outside the range of validity of the Antoine equation coefficients in Table B.4. An alternative is to look up the vapor pressure of acetone at that temperature in a handbook. The final result is almost identical.)... 

This is a repeat of Example 3.5. We must find, by trial and error, the temperature at which the sum of the computed ideal solution vapor-phase mol fractions is 1.00. For our first try, we guess r=80°C. Using the Antoine equation constants in Table A.2, we compute that at 80°C the two pure species vapor pressures for acetone and for water are 2.11 and 0.47 atm. Then multiplying each of these by the corresponding liquid mol fractions and dividing by 1 atm, we find that the computed vapor mol fractions are 0.106 and 0.444, and that their sum is 0.55. This is less than 1.00, so our assumed temperature is too low. These values are shown as the first data row in Table 8.A. The calculation was done on a spreadsheet, with which one can quickly repeat the calculation for various assumed temperatures and display the results in subsequent rows of Table 8. A. The assumed temperature that makes the sum of the vapor-phase mol fractions equal 1.00 is T = 96.406 °C. (We should not believe that we know any boiling temperature 0.001°C, we should report the calculated boiling temperature as 96.4°C). ... 

Estimate the vapor pressure of n-hexane and acetone using the corresponding states principle and compare the results with those obtained with the Antoine equation. 

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