Solid amine adsorbent of CO2 and method for preparing same

A method for preparing a solid amine adsorbent of CO2, comprising,

• continuously introducing a gas mixture containing 10 vol. % to 20 vol. % of CO2 into a reactor still containing a sodium aluminate solution having a concentration in a range of 10 g/L to 100 g/L at room temperature to obtain a reaction solution, until a pH value of the reaction solution is lowered to 9.5 to 9.8 to obtain a product solution containing a precipitate, with a flow rate of the gas mixture being 600 mL/min to 1000 mL/min of CO2 per liter of the sodium aluminate solution;
• filtering out the precipitate in the product solution, and washing the precipitate;
• mixing the filtered and washed precipitate with an organic alcohol at a mass ratio of 1:5 to 1:30 to obtain a suspension;
• heating the suspension to an azeotropic point of water and the organic alcohol, evaporating for 10 min to 60 min, then heating the suspension to a boiling point of the organic alcohol and refluxing for 30 min to 90 min to obtain a pore-enlarged pseudo boehmite;
• calcining the pore-enlarged pseudo boehmite to obtain an aluminum oxide powder;
• and
• impregnating the aluminum oxide powder in an organic amine solution, and drying to obtain the solid amine adsorbent of CO2.