K_2CO_3/hindered cyclic amine blend (SEFY-1) as a solvent for CO_2 capture from various industries

摘要

The solvent blend of potassium carbonate and hindered cyclic amines having higher solubility, 500g/L water at 25°C, and boiling point over 150°C, SEFY-1 (Save Earth's Future by Yoon), has been investigated as an alternative of alkanolamines such as MEA or AMP/PZ for CO_2 capture from power plants using coal and industries having exit CO_2 concentration below 28 vol%. SEFY-1 offers several advantages in comparison with previous solvents because of very low heat of absorption, low volatility, high resistance to thermal and reactive degradation by SO_2, so cheaper than KS-1 solvent, no formation of salts and a lot of application for various industries having different CO_2 feed concentration such as power plant (8~13%), steel (15~20%), cement (15~25%) and chemical industries. We concluded many advantages of SEFY-1 by various experiment, vapor liquid equilbrium test, corrosion test, reaction calorimeter, wetted wall column test, unit operation of absorption tower and so on. Specially, the heat of absorption, 1.36 CJ/tCO_2, of SEFY-1 was analyzed by Mettler Toredo Reaction Calorimeter. This is innovative result in comparison with commercial solution, MEA 30wt% (1.93 GJ/tCO_2) and KS-1 (1.55 GJ/tCO_2).