In this experiment, the absorption of carbon dioxide (CO2) from air using a solution of sodium hydroxide (NaOH) is studied in three columns containing different type of packing materials. The three packing materials studied include Pall rings, Stainless steel and Rasching rings. These materials were compared in order to observe their effect on the absorption efficiently and determine the most efficient one. In order to find the optimal condition for this absorption process four parameters are studied including the packing material, the NaOH concentration in the solution, the flowrate of this solution through the column and the CO2 concentration in the gas mixture.
Each parameter was varied while everything else was kept constant to observed it effect on the system. Each trial was repeated twice and the standard deviation is computed in order to assure that the data collected is reliable.
It has been observed that an increase in NaOH concentration in the solution results in an increase in CO2 absorption and that a higher liquid flowrate is preferable as is also increases the absorption. It was found that increasing the CO2 concentration in the gas mixture results in a decrease in the overall absorption of CO2 for air.
As for the packing material, it has been shown that the most efficient materials have the highest bed void fractions resulting in a high contact surface area between the liquid and gas allowing for a better absorption. The Pall ring and Stainless steel packing seem to provide the largest contact surface area.
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