Prof. Marr decides to try an experiment distilling a generic bottle of 80 proof (40% by vol.)alcohol to enhance its potency (do not try this at home). He wishes to construct a simple singlestage flash system that can handle a feed rate of 2 mol/min. Using his stove, he can maintain atemperature of 363 K and a pressure of 0.9 bar (~ Patm in Golden). Before he begins he wouldlike to estimate the purity of the vapor system (to be cooled afterwards into a finished product).He knows the alcohol he has purchased is not an ideal solution, and chooses the Margules (2term) activity model to estimate the activity coefficients for an ethanol (1) and water (2) system.Estimate the composition, y1, and vapor flow rate, V, for this process. The answers are 0.312 and 0.54 mol/min.After looking up in his trusty thermo textbook he finds the following values:P1 sat=1.476 bar (at 363 K) A12= 0.6848P2 sat =0.693 bar (at 363 K) A21 = 0.3781You may assume no volume change of mixing and that ρ1 = 0.789 g/mL and ρ2 = 1 g/mL.
Prof. Marr decides to try an experiment distilling a generic bottle of 80 proof (40% by vol.)
alcohol to enhance its potency (do not try this at home). He wishes to construct a simple single
stage flash system that can handle a feed rate of 2 mol/min. Using his stove, he can maintain a
temperature of 363 K and a pressure of 0.9 bar (~ Patm in Golden). Before he begins he would
like to estimate the purity of the vapor system (to be cooled afterwards into a finished product).
He knows the alcohol he has purchased is not an ideal solution, and chooses the Margules (2
term) activity model to estimate the activity coefficients for an ethanol (1) and water (2) system.
Estimate the composition, y1, and vapor flow rate, V, for this process. The answers are 0.312 and 0.54 mol/min.
After looking up in his trusty thermo textbook he finds the following values:
P1 sat=1.476 bar (at 363 K) A12= 0.6848
P2 sat =0.693 bar (at 363 K) A21 = 0.3781
You may assume no volume change of mixing and that ρ1 = 0.789 g/mL and ρ2 = 1 g/mL.
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