Chemical Absorption of Carbon Dioxide into Aqueous PAA Solution of NaOH

Carbon dioxide was absorbed into aqueous polyacrylamide (PAA) solution containing NaOH in a flat‐stirred vessel to investigate the effect of non‐Newtonian rheological behavior of PAA on the rate of chemical absorption of CO2, where the reaction between CO2 and NaOH was assumed to be a first‐order reaction with respect to the molar concentration of CO2 and NaOH, respectively. The liquid‐side mass transfer coefficient (kL), which was obtained from the dimensionless empirical equation containing the properties of viscoelasticity of the non‐Newtonian liquid, was used to estimate the enhancement factor due to chemical reaction. PAA with elastic property of non‐Newtonian liquid made the rate of chemical absorption of CO2 accelerate compared with Newtonian liquid.