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2. Pure solvent with a flowrate of 50 kmol/h is sent to the top of a trayed absorber while gas with a flowrate of 150 kmol/h enters at the bottom of the absorber. The solute mole fraction in the gas at the inlet is 0.050. Other than the solute, the incoming gas contains only an inert, which has negligible solubility in the solvent. The absorber has 20 stages and its operating pressure is 5 bar. Assume the tower is operating isothermally at 50°C under the base case condition. The solvent has very low vapor pressure at the absorber operating temperature so the solvent loss at the absorber outlet gas is negligible. Assume that the solute follows Raoult's law, pressure drop through the tower is negligible, and L/G is relatively constant throughout the tower. 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=2.5 and B=500 T a. What is the flowrate (in kmol/h) of the gas from the absorber top? 6 b. It is desired that the solute concentration from the absorber outlet be further reduced. Unfortunately, no change can be made to the solvent flowrate or to its temperature or to the tower hardware. Suggest at least one strategy for achieving the desired goal. Explain the rationale behind your suggestion mathematically (i.e. using equations). You don't need to plug in any number for answering this question.

2. Pure solvent with a flowrate of 50 kmol/h is sent to the top of a trayed absorber while gas with a flowrate of 150 kmol/h enters at the bottom of the absorber. The solute mole fraction in the gas at the inlet is 0.050. Other than the solute, the incoming gas contains only an inert, which has negligible solubility in the solvent. The absorber has 20 stages and its operating pressure is 5 bar. Assume the tower is operating isothermally at 50°C under the base case condition. The solvent has very low vapor pressure at the absorber operating temperature so the solvent loss at the absorber outlet gas is negligible. Assume that the solute follows Raoult's law, pressure drop through the tower is negligible, and L/G is relatively constant throughout the tower. 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=2.5 and B=500 T a. What is the flowrate (in kmol/h) of the gas from the absorber top? 6 b. It is desired that the solute concentration from the absorber outlet be further reduced. Unfortunately, no change can be made to the solvent flowrate or to its temperature or to the tower hardware. Suggest at least one strategy for achieving the desired goal. Explain the rationale behind your suggestion mathematically (i.e. using equations). You don't need to plug in any number for answering this question.

Introduction to Chemical Engineering Thermodynamics
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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2. Pure solvent with a flowrate of 50 kmol/h is sent to the top of a trayed absorber while gas with a flowrate of 150 kmol/h enters at the bottom of the absorber. The solute mole fraction in the gas at the inlet is 0.050. Other than the solute, the incoming gas contains only an inert, which has negligible solubility in the solvent. The absorber has 20 stages and its operating pressure is 5 bar. Assume the tower is operating isothermally at 50°C under the base case condition. The solvent has very low vapor pressure at the absorber operating temperature so the solvent loss at the absorber outlet gas is negligible. Assume that the solute follows Raoult's law, pressure drop through the tower is negligible, and L/G is relatively constant throughout the tower. 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=2.5 and B=500 T a. What is the flowrate (in kmol/h) of the gas from the absorber top? 6 b. It is desired that the solute concentration from the absorber outlet be further reduced. Unfortunately, no change can be made to the solvent flowrate or to its temperature or to the tower hardware. Suggest at least one strategy for achieving the desired goal. Explain the rationale behind your suggestion mathematically (i.e. using equations). You don't need to plug in any number for answering this question.
Transcribed Image Text:2. Pure solvent with a flowrate of 50 kmol/h is sent to the top of a trayed absorber while gas with a flowrate of 150 kmol/h enters at the bottom of the absorber. The solute mole fraction in the gas at the inlet is 0.050. Other than the solute, the incoming gas contains only an inert, which has negligible solubility in the solvent. The absorber has 20 stages and its operating pressure is 5 bar. Assume the tower is operating isothermally at 50°C under the base case condition. The solvent has very low vapor pressure at the absorber operating temperature so the solvent loss at the absorber outlet gas is negligible. Assume that the solute follows Raoult's law, pressure drop through the tower is negligible, and L/G is relatively constant throughout the tower. 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=2.5 and B=500 T a. What is the flowrate (in kmol/h) of the gas from the absorber top? 6 b. It is desired that the solute concentration from the absorber outlet be further reduced. Unfortunately, no change can be made to the solvent flowrate or to its temperature or to the tower hardware. Suggest at least one strategy for achieving the desired goal. Explain the rationale behind your suggestion mathematically (i.e. using equations). You don't need to plug in any number for answering this question.
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