(15) 7. In a trayed tower, the solute mole fractions in the gas at the inlet and outlet are 0.016 and 0.002, respectively, under base case conditions when the tower pressure is 1 bar and it is operating isothermally at 50°C. The incoming solvent has no solute content in it. Under base case conditions, the incoming solvent and gas flowrates are 75 kmol/h and 150 kmol/h, respectively. The absorber has 20 theoretical stages. Under new conditions, the gas flowrate is 1.25 times that in the base case and the solute mole fraction in the gas at the inlet is 0.02. Inlet solvent flowrate remains the same as the base case, but the solvent temperature is adjusted such that the tower now operates isothermally at 40°C. To achieve the same solute concentration at the gas outlet as the base case, how much should the tower pressure be changed in comparison to the base case? Assume that it is a dilute system. Assume that the L/G is constant throughout the tower, Kremser equation can be applied, and the solute follows Raoult's law. B Vapor pressure of the solute is given by the Antoine equation: In P* = A- when P* is in bar and T is in K, A=2.3 and B=480 T * YA,out - YA,out YA,in - YA,out 1-A 1-4N+1
(15) 7. In a trayed tower, the solute mole fractions in the gas at the inlet and outlet are 0.016 and 0.002, respectively, under base case conditions when the tower pressure is 1 bar and it is operating isothermally at 50°C. The incoming solvent has no solute content in it. Under base case conditions, the incoming solvent and gas flowrates are 75 kmol/h and 150 kmol/h, respectively. The absorber has 20 theoretical stages. Under new conditions, the gas flowrate is 1.25 times that in the base case and the solute mole fraction in the gas at the inlet is 0.02. Inlet solvent flowrate remains the same as the base case, but the solvent temperature is adjusted such that the tower now operates isothermally at 40°C. To achieve the same solute concentration at the gas outlet as the base case, how much should the tower pressure be changed in comparison to the base case? Assume that it is a dilute system. Assume that the L/G is constant throughout the tower, Kremser equation can be applied, and the solute follows Raoult's law. B Vapor pressure of the solute is given by the Antoine equation: In P* = A- when P* is in bar and T is in K, A=2.3 and B=480 T * YA,out - YA,out YA,in - YA,out 1-A 1-4N+1
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Use this equation to solve it.
Transcribed Image Text:(15) 7. In a trayed tower, the solute mole fractions in the gas at the inlet and outlet are 0.016
and 0.002, respectively, under base case conditions when the tower pressure is 1 bar
and it is operating isothermally at 50°C. The incoming solvent has no solute content in
it. Under base case conditions, the incoming solvent and gas flowrates are 75 kmol/h
and 150 kmol/h, respectively. The absorber has 20 theoretical stages. Under new
conditions, the gas flowrate is 1.25 times that in the base case and the solute mole
fraction in the gas at the inlet is 0.02. Inlet solvent flowrate remains the same as the
base case, but the solvent temperature is adjusted such that the tower now operates
isothermally at 40°C. To achieve the same solute concentration at the gas outlet as the
base case,
how much should the tower pressure be changed in comparison to the base
case?
Assume that it is a dilute system. Assume that the L/G is constant throughout the tower,
Kremser equation can be applied, and the solute follows Raoult's law.
B
Vapor pressure of the solute is given by the Antoine equation: In P* = A-
when P* is in bar and T is in K, A=2.3 and B=480
T
Transcribed Image Text:*
YA,out - YA,out
YA,in - YA,out
1-A
1-4N+1
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