Investigation on Carbon Dioxide Regeneration from Ammonium Bicarbonate Solution in a Packed Reactor

Abstract

The desorption of carbon dioxide from ammonium bicarbonate solution in a packed column was investigated. The CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> regeneration efficiency and the CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> regeneration rate were evaluated over ranges of main operating variables, that is, up to 50L/min gas flow rate of N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , 8~24L/h liquid flow rate, 0.4~2.0mol/L ammonium bicarbonate concentration and 60~95°C temperature. Experimental results suggested that the CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> regeneration efficiency and the CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> regeneration rate increased with the gas flow rate of N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , the concentration of ammonium bicarbonate solution and temperature. The temperature played an important role in the decomposition of ammonium bicarbonate solution, the CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> regeneration efficiency is more than 90% when temperature in the packed column up to 95°C. Experimental results also demonstrated that the decomposition of ammonium bicarbonate solution is a second-order reaction.