Chemical Engineering & Technology, Vol.35, No.3, 513-524, 2012
Screening of Aqueous Amine-Based Solvents for Postcombustion CO2 Capture by Chemical Absorption
In relation with CO2 capture by chemical absorption into aqueous amine-based solvents, absorption and regeneration parameters by separate absorption and regeneration tests are determined. An absorption parameter for different types of amine-based solvents is evaluated by performing absorption tests at 298?K and atmospheric pressure with a gas-liquid contactor and deducing apparent kinetic constants. The regeneration parameter is obtained from a CO2 concentration temporal profile measured in a regeneration cell at the boiling temperature of each solvent. By combining both parameters it is possible to compare the absorption-regeneration performances of all the solvents studied. Good absorption-regeneration performances of cyclical amines, especially of piperidine (PIP) and piperazine (PZ), are highlighted. The interesting potential of 2-amino-2-methyl-1-propanol (AMP) and methyldiethanolamine (MDEA) activated with PZ and PIP is also considered.