Gas Absorption
CHEMICAL ENGINEERING DEPARTMENT
COLLEGE OF ENGINEERING XAVIER UNIVERSITY – ATENEO DE CAGAYAN
CAGAYAN DE ORO CITY
GAS ABSORPTION COLUMN - MASS TRANSFER EXPERIMENT B
ChE 35 Chemical Engineering Laboratory II
Acabo, Dean Cris Aguirre, Ian Carlo Belarmino, Arniel Catan, Charles John
Engr. Marco Theodore E. Escaňo ChE 35 Instructor
October 2012
OBJECTIVE: To calculate rate of absorption of carbon dioxide into water from analysis of liquid solutions flowing down the absorption column. THEORETICAL BACKGROUND: Absorption refers to the transfer of a gaseous component from the gas phase to a liquid phase. The liquid surface area available for mass transfer and the time available for diffusion of the gaseous molecules into the liquid are important factors affecting performance. Absorption can be divided into two broad classifications: straight dissolution of absorbate (contaminant gas) into absorbent (liquid), and dissolution accompanied by irreversible chemical reaction. The gaseous contaminant being absorbed (absorbate) must be at least slightly soluble in the scrubbing liquid (absorbent). Mass transfer to the liquid continues until the liquid approaches saturation. At saturation, equilibrium is established between the two phases. The mass transfer rate of the contaminant into the liquid is equal to the mass transfer rate of the dissolved species back into the gas phase. Accordingly, the solubility of the contaminant in the liquid creates a limit to the amount of pollutant removal that can occur with a given quantity of liquid. This solubility limit can be overcome by providing reactants in the liquid phase that react with the dissolved gas contaminant, forming a dissolved compound that cannot exit the liquid. In this experiment, the performance of a packed gas-liquid absorption column is evaluated. A water steam entering the top of the column and exiting the bottom is used to absorb carbon dioxide (CO2) gas from air. The CO2 composition of the inlet
COLLEGE OF ENGINEERING XAVIER UNIVERSITY – ATENEO DE CAGAYAN
CAGAYAN DE ORO CITY
GAS ABSORPTION COLUMN - MASS TRANSFER EXPERIMENT B
ChE 35 Chemical Engineering Laboratory II
Acabo, Dean Cris Aguirre, Ian Carlo Belarmino, Arniel Catan, Charles John
Engr. Marco Theodore E. Escaňo ChE 35 Instructor
October 2012
OBJECTIVE: To calculate rate of absorption of carbon dioxide into water from analysis of liquid solutions flowing down the absorption column. THEORETICAL BACKGROUND: Absorption refers to the transfer of a gaseous component from the gas phase to a liquid phase. The liquid surface area available for mass transfer and the time available for diffusion of the gaseous molecules into the liquid are important factors affecting performance. Absorption can be divided into two broad classifications: straight dissolution of absorbate (contaminant gas) into absorbent (liquid), and dissolution accompanied by irreversible chemical reaction. The gaseous contaminant being absorbed (absorbate) must be at least slightly soluble in the scrubbing liquid (absorbent). Mass transfer to the liquid continues until the liquid approaches saturation. At saturation, equilibrium is established between the two phases. The mass transfer rate of the contaminant into the liquid is equal to the mass transfer rate of the dissolved species back into the gas phase. Accordingly, the solubility of the contaminant in the liquid creates a limit to the amount of pollutant removal that can occur with a given quantity of liquid. This solubility limit can be overcome by providing reactants in the liquid phase that react with the dissolved gas contaminant, forming a dissolved compound that cannot exit the liquid. In this experiment, the performance of a packed gas-liquid absorption column is evaluated. A water steam entering the top of the column and exiting the bottom is used to absorb carbon dioxide (CO2) gas from air. The CO2 composition of the inlet
References: http://www.epa.gov/apti/Materials/APTI%20415%20student/415%20Student%20Manual /415%20SM%20Chapter%205_Final.pdf http://www.epa.gov/apti/bces/module4/absorption/absorption.htm http://www.wpi.edu/Pubs/E-project/Available/E-project-042408133605/unrestricted/Modeling_Absorption.pdf http://www.unb.ca/che/Undergrad/lab/gasab.pdf http://en.wikipedia.org/wiki/Carbon_dioxide http://www.engineeringtoolbox.com/gases-solubility-water-d_1148.html