Retrofitting and Performance Evaluation of Packed Gas Absorption Column and Comparative Analysis of Titration Methods for Carbon Dioxide Absorption in Water

Author : Ignacio, Angelo Nico Perez
Major Adviser : Guerrero, Gino Apollo M.
Committee Members : Valencia, Jeanne Michelle T.; Arocena, Rhebner E.
Year : 2017
Month : July
Type : Thesis
Degree: BS
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CO₂ absorption is an important process in the industry to capture CO₂ to prevent it from accumulating in the atmosphere. A packed gas absorption column designed by Saavedra (2016) was repaired and improved by this study. Flow meters and regulators were installed to improve accuracy in measuring liquid flow rate and gas flow rate. The gas absorption column was tested by applying a two-level factorial with solvent flow rate, CO₂ mole fraction and type of gas mixed with CO₂. Screening of parameters showed that all factors are significant and all interaction between factors are insignificant. Increasing solvent flow rate and CO₂ mole fraction in gas increased the CO₂ recovery. Using air-CO₂ mixture resulted in a higher CO₂ recovery than using nitrogen-CO₂ mixture. The sample was analysed using single indicator titration and potentiometric titration. Comparing the measured percent CO₂ recovery using the two methods showed an average percent difference of 3.33 % ± 2.05 %. Large error in measured CO₂ recovery was obtained due to diffusion of CO₂ in water over time and recirculation of CO₂ exhaust gas in the system when using the air compressor.

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