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1. In a packed absorber, solvent and air inlet flowrates are 20 kmol/h and 80 kmol/h, respectively, under base case condition. Solute mole fractions in the air at the inlet and outlet are 0.01 and 0.006, respectively. The absorber has 20 transfer units and its operating pressure is 3 bar. Assume tower is operating isothermally (note absorption is generally exothermic, but for simplicity assume isothermal operation) at 60°C under base case condition. 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. B T Due to some issue with the solvent pump, the solvent flowrate got decreased by 15%. What is the new outlet mole fraction of the solute? 5 b. You have been asked to look into a possible solution to this problem. You started decreasing the tower operating temperature by decreasing the solvent temperature and observed that when the tower temperature (assume no temperature change along the tower, i.e. isothermal operation) is 30°C, outlet mole fraction of the solute becomes same as the base case. What are the values of A and B in the Antoine Equation for the solute? 5

1. In a packed absorber, solvent and air inlet flowrates are 20 kmol/h and 80 kmol/h, respectively, under base case condition. Solute mole fractions in the air at the inlet and outlet are 0.01 and 0.006, respectively. The absorber has 20 transfer units and its operating pressure is 3 bar. Assume tower is operating isothermally (note absorption is generally exothermic, but for simplicity assume isothermal operation) at 60°C under base case condition. 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. B T Due to some issue with the solvent pump, the solvent flowrate got decreased by 15%. What is the new outlet mole fraction of the solute? 5 b. You have been asked to look into a possible solution to this problem. You started decreasing the tower operating temperature by decreasing the solvent temperature and observed that when the tower temperature (assume no temperature change along the tower, i.e. isothermal operation) is 30°C, outlet mole fraction of the solute becomes same as the base case. What are the values of A and B in the Antoine Equation for the solute? 5

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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1. In a packed absorber, solvent and air inlet flowrates are 20 kmol/h and 80 kmol/h, respectively, under base case condition. Solute mole fractions in the air at the inlet and outlet are 0.01 and 0.006, respectively. The absorber has 20 transfer units and its operating pressure is 3 bar. Assume tower is operating isothermally (note absorption is generally exothermic, but for simplicity assume isothermal operation) at 60°C under base case condition. 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. B T Due to some issue with the solvent pump, the solvent flowrate got decreased by 15%. What is the new outlet mole fraction of the solute? 5 b. You have been asked to look into a possible solution to this problem. You started decreasing the tower operating temperature by decreasing the solvent temperature and observed that when the tower temperature (assume no temperature change along the tower, i.e. isothermal operation) is 30°C, outlet mole fraction of the solute becomes same as the base case. What are the values of A and B in the Antoine Equation for the solute? 5
Transcribed Image Text:1. In a packed absorber, solvent and air inlet flowrates are 20 kmol/h and 80 kmol/h, respectively, under base case condition. Solute mole fractions in the air at the inlet and outlet are 0.01 and 0.006, respectively. The absorber has 20 transfer units and its operating pressure is 3 bar. Assume tower is operating isothermally (note absorption is generally exothermic, but for simplicity assume isothermal operation) at 60°C under base case condition. 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. B T Due to some issue with the solvent pump, the solvent flowrate got decreased by 15%. What is the new outlet mole fraction of the solute? 5 b. You have been asked to look into a possible solution to this problem. You started decreasing the tower operating temperature by decreasing the solvent temperature and observed that when the tower temperature (assume no temperature change along the tower, i.e. isothermal operation) is 30°C, outlet mole fraction of the solute becomes same as the base case. What are the values of A and B in the Antoine Equation for the solute? 5
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