Question

2. (22 marks - 22 min) A process consisting of an absorption tower and a stripping tower is used to separate the components of a gas containing 27.0 mole% component A and the balance component B. A stream of this gas is fed to the absorber. A liquid containing 0.480 mole% dissolved A and the balance B is recycled from the stripper and fed to the absorber. The product gas leaving the top of the absorber contains 1.00 mole% A and essentially all of the B fed to the unit. The A-rich liquid solvent leaving the bottom of the absorber is fed to the stripper and a stream of nitrogen gas is fed to the stripper. Eighty-five percent of the A in the liquid feed to the stripper comes out of solution, and the nitrogen/A stream leaving the column passes out to the atmosphere through a stack. The liquid stream leaving the stripping tower is the 0.480% component A solution recycled to the absorber. a. Taking a basis of 100 mol/h of gas fed to the absorber, draw and label a flowchart of the process. For the stripper outlet gas, label the component molar flow rates rather than the total flow rate and mole fractions. (/14 marks) b. Calculate the molar flow rate (in mol/h) of A entering the stripping unit and the molar flow rate (in mol/h) of the liquid stream exiting the stripping unit and entering the absorption unit. (/8 marks)

          2. (22 marks - 22 min) A process consisting of an absorption tower and a stripping tower is used to
separate the components of a gas containing 27.0 mole% component A and the balance component
B. A stream of this gas is fed to the absorber. A liquid containing 0.480 mole% dissolved A and the
balance B is recycled from the stripper and fed to the absorber. The product gas leaving the top of the
absorber contains 1.00 mole% A and essentially all of the B fed to the unit. The A-rich liquid solvent
leaving the bottom of the absorber is fed to the stripper and a stream of nitrogen gas is fed to the
stripper. Eighty-five percent of the A in the liquid feed to the stripper comes out of solution, and the
nitrogen/A stream leaving the column passes out to the atmosphere through a stack. The liquid
stream leaving the stripping tower is the 0.480% component A solution recycled to the absorber.
a. Taking a basis of 100 mol/h of gas fed to the absorber, draw and label a flowchart of the process.
For the stripper outlet gas, label the component molar flow rates rather than the total flow rate
and mole fractions. (/14 marks)
b. Calculate the molar flow rate (in mol/h) of A entering the stripping unit and the molar flow rate
(in mol/h) of the liquid stream exiting the stripping unit and entering the absorption unit. (/8
marks)

$2. (22 marks - 22 min) A process consisting of an absorption tower and a stripping tower is used to separate the components of a gas containing 27.0 mole% component A and the balance component B. A stream of this gas is fed to the absorber. A liquid containing 0.480 mole% dissolved A and the balance B is recycled from the stripper and fed to the absorber. The product gas leaving the top of the absorber contains 1.00 mole% A and essentially all of the B fed to the unit. The A-rich liquid solvent leaving the bottom of the absorber is fed to the stripper and a stream of nitrogen gas is fed to the stripper. Eighty-five percent of the A in the liquid feed to the stripper comes out of solution, and the nitrogen/A stream leaving the column passes out to the atmosphere through a stack. The liquid stream leaving the stripping tower is the 0.480% component A solution recycled to the absorber. a. Taking a basis of 100 mol/h of gas fed to the absorber, draw and label a flowchart of the process. For the stripper outlet gas, label the component molar flow rates rather than the total flow rate and mole fractions. (/14 marks) b. Calculate the molar flow rate (in mol/h) of A entering the stripping unit and the molar flow rate (in mol/h) of the liquid stream exiting the stripping unit and entering the absorption unit. (/8 marks)$

Added by Samantha C.

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