Experimental Study on the Separation of CO2 from Flue Gas Using Hollow Fiber Membrane Contactors with Aqueous Solution of Potassium Glycinate

Abstract

Experimental study on CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> removal from flue gas using polypropylene hollow fiber membrane contactors were conducted. Aqueous solutions of potassium glycinate were used as absorption solution to absorb CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in the experiments. Under moderate operating conditions, effects of the absorption solution flow rate, concentration of potassium glycinate, and absorption solution capacity on the mass transfer rate of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and absorption solution CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> loading were studied on a pilot-scale test facility. The results showed that the mass transfer rate of aqueous potassium glycinate decreased gradually in experiments while the absorption solution CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> loading increased. The mass transfer rate and absorption solution CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> loading of aqueous potassium glycinate with higher concentration was higher than that of aqueous potassium glycinate with lower concentration. The aqueous potassium glycinate with longer regeneration time was better in continuous running. The performance of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> absorption using potassium glycinate is superior to monoethanolamine and methyldiethanolamine under the same operating conditions.