A packed column is used to absorb carbon dioxide (CO2) from the air into an aqueous solution of monoethanolamine (MEA). The whole system operates at 40°C and 1 atm. A pair of laminar films is created by the gas-liquid interface during the absorption process. The resistance to mass transfer is affected by the film created in each phase. The molar and volumetric flow rates of the air at the inlet are 5.5 kmol min-1 and 153.5 m³ min-1, respectively. The interfacial concentration of CO2 is 2.5 mol% and its concentration in the bulk liquid phase is 1.45 x 10-3 kmol m-3. The equilibrium data for the gas-liquid phases is given with the following correlation: Cco, =1.05×10*Peo. where Cco2 (kmol m-3) is the concentration of CO2 in the liquid phase and Pco2 (N-m-2) is the gas phase concentration. The diffusivity of CO2 in air (Dco2,air) at 40°C and 1 atm is 1.6 x 105 m² s-1. The gas interfacial film thickness is 0.15 x 10-3 m. Assume the Dalton's and ideal gas laws apply to the system. The air is insoluble in the MEA solution. (d) Determine the percentages of resistance to mass transfer in the gas and liquid phases, respectively. (e) Identify five factors that determine the optimum flow of scrubbing liquid in an absorption column.
A packed column is used to absorb carbon dioxide (CO2) from the air into an aqueous solution of monoethanolamine (MEA). The whole system operates at 40°C and 1 atm. A pair of laminar films is created by the gas-liquid interface during the absorption process. The resistance to mass transfer is affected by the film created in each phase. The molar and volumetric flow rates of the air at the inlet are 5.5 kmol min-1 and 153.5 m³ min-1, respectively. The interfacial concentration of CO2 is 2.5 mol% and its concentration in the bulk liquid phase is 1.45 x 10-3 kmol m-3. The equilibrium data for the gas-liquid phases is given with the following correlation: Cco, =1.05×10*Peo. where Cco2 (kmol m-3) is the concentration of CO2 in the liquid phase and Pco2 (N-m-2) is the gas phase concentration. The diffusivity of CO2 in air (Dco2,air) at 40°C and 1 atm is 1.6 x 105 m² s-1. The gas interfacial film thickness is 0.15 x 10-3 m. Assume the Dalton's and ideal gas laws apply to the system. The air is insoluble in the MEA solution. (d) Determine the percentages of resistance to mass transfer in the gas and liquid phases, respectively. (e) Identify five factors that determine the optimum flow of scrubbing liquid in an absorption column.
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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Transcribed Image Text:A packed column is used to absorb carbon dioxide (CO2) from the air into
an aqueous solution of monoethanolamine (MEA). The whole system operates
at 40°C and 1 atm. A pair of laminar films is created by the gas-liquid interface
during the absorption process. The resistance to mass transfer is affected by
the film created in each phase. The molar and volumetric flow rates of the air at
the inlet are 5.5 kmol min 1 and 153.5 m³ min 1, respectively. The interfacial
concentration of CO2 is 2.5 mol% and its concentration in the bulk liquid phase
is 1.45 x 10-3 kmol m-3. The equilibrium data for the gas-liquid phases is given
with the following correlation:
Cco, =1.05×10 Po.
where Cco2 (kmol m-3) is the concentration of CO2 in the liquid phase and
Pco2 (N m-2) is the gas phase concentration. The diffusivity of CO2 in air (Dco2,air)
at 40°C and 1 atm is 1.6 x 105 m² s-1. The gas interfacial film thickness is
0.15 x 10-3 m. Assume the Dalton's and ideal gas laws apply to the system. The
air is insoluble in the MEA solution.
(d) Determine the percentages of resistance to mass transfer in the gas and
liquid phases, respectively.
(e) Identify five factors that determine the optimum flow of scrubbing liquid in
an absorption column.
Data for Question 4:
Ideal gas constant R = 8.314 J mol-1 K-1.
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