Abstract:
The absorption of CO2 into an aqueous solution with 1.45 mol/L 1, 5, 8, 12- tetraazadodecane (APEDA)
polyamine has been studied at three temperature (298, 313, 333 K) in a Lewis type absorber with a constant gas- liquid
interface area of (15.34 ± 0.05) x 10 -4 m 2
. The experimental results have been interpreted using the equations derived
from the two film model with the assumption that the absorption occurred in the fast pseudo- first- order kinetic regime.
The results confirmed the validity of this assumption for the experimental conditions: the enhancement factor was always
greater than 3. The rate constant derived from the experimental data (kov, s-1) was correlated through the Arrhenius plot (
ln kov = A- B/T), and the optimal values of the constants A and B were obtained by the linear regression. The absorption
of CO2 from flue gas into APEDA solution is a promising process for practical application at least from the kinetic point of
view. The rate constant derived from experiments is of the same order of magnitude as that for the absorption into 2-
amino- 2- methyl- 1- propanol (AMP) activated with piperazine (PZ) which was found to be the most advanced system
among the published data up to now.