Industrial Plastics: Theory and Applications
6th Edition
ISBN: 9781285061238
Author: Lokensgard, Erik
Publisher: Delmar Cengage Learning
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We have a feed that is a binary mixture of methanol and water (55.0 mol% methanol) that is sent to a system of two flash drums hooked together. The vapor from the first drum is cooled, which partially condenses the vapor, and then is fed to the second flash drum. Both drums operate at a pressure of 1.0 atm and are adiabatic. The feed rate to the first drum is 1000.0 kmol/h. We desire a liquid product from the first drum that is 30.0 mol% methanol (x1 = 0.300). The second drum operates at a fraction vaporized of (V/F)2 = 0.250. The equilibrium data are in Table 2-8.
Find the following for the first drum: y1, T1, (V/F)1, and vapor flow rate V1.
Find the following for the second drum: y2, x2, T2, and vapor flow rate V2.
Show that the overall mass transfer coefficient, Ky, can be related to the individual
gas and liquid film mass transfer coefficients, ky and kx, respectively, by the
following equation:
1
K
y
=
1
+
m
kk
y
x
Use the approach given to solve
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- Antoine constants for vapor pressure for n-pentane and n-hexane are listed in Table 2-3. a. Predict the vapor pressure at 0.0°C for pure n-pentane. b. Predict the boiling point of pure n-pentane at 3.0 atm pressure. c. Predict the boiling pressure if pure n-pentane is boiling at 0.0°C. d. At a pressure of 500.0 mm Hg and temperature of 30.0°C, predict the K values for n-pentane and n-hexane using Raoult’s law. e. If T = 30.0°C and p = 500.0 mm Hg, determine the mole fractions in the liquid and vapor phases of an equilibrium mixture of n-pentane and n-hexane. f. 1.0 moles of a mixture that is 75.0 mol% n-pentane and 25.0 mol% n-hexane is placed in a closed chamber. The pressure is adjusted to 500.0 mm Hg, and the temperature to 30.0°C. The vapor and liquid mole fractions were found in part e. How many moles of liquid and moles of vapor are there at equilibrium? g. If 1.0 mol/min of a mixture that is 75.0 mol% n-pentane and 25.0 mol% n-hexane is fed continuously to an equilibrium flash…arrow_forwardA 40 mol % ethanol 60 mol % water mixture at 60 °C and 1 atm is heated. Using Figure 2-3 answer the following:a. At what temperature does the mixture first begin to boil? What is the composition of the first bubble of vapor?b. At what temperature would it stop boiling (assume no material is removed)? What is the composition of the last droplet of liquid?c. At 82 °C, what fraction is liquid? d. When 90% has been vaporized, what is the temperature, and what are the liquid and vapor compositions?arrow_forwardIs a component with a lower vapor pressure more or less volatile than a component with a higher vapor pressure? Briefly explain.arrow_forward
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