A B S T R A C TThe present paper deals with studying the dynamic model and control of absorption column by implementing two types of control strategies for CO2 gas and NaOH solution. The control methods in this study are PID, fuzzy with five membership function. The results showed that a good improvement for CO2/Air-NaOH system with chemical reaction is achieved when the fuzzy logic with five membership function because these methods have more suitable, lower over shoot, less offset value and less integral absolute error.

The kinetics reaction of the tertiary amine blend of monoethanolamine (MEA), triethanolamine (TEA), and piperazine (PZ) with carbon dioxide (CO2) considered in a packed bed. The mechanism of reaction and kinetics of this tertiary amine were studied at (298-308) K and 1atm with total blend concentration varied from (4-6) molars. The current experiments revealed a new good absorbent of (MEA, TEA, PZ ) blend to capture CO2, due to it is potential upon CO2. Therefore, the proposed mechanism found to be suitable in determining the kinetics of the involved reactions. The reaction mechanism was defined using a mechanism of zwitterion and termolecular. It’s found that the absorption follows the fast kinetic reaction with first-order kinetics for CO2 and second-order for the blend concentration. The rate constant value k2 (m3/kmol.s) of the tertiary blend of (MEA, TEA, PZ )found to be (8050) that is greater than that of commonly used amine MEA(7500). Also, the activation energy was calculated and found to be 24 kJ/mol.