Carbon Dioxide Absorption in a Packed Column Using Guanidine-based Superbase Solution

The study of CO2 absorption in a packed column by 1,1,3,3-tetramethylguanidine (TMG) dissolved in eth- ylene glycol is presented. Absorption column of inner diameter 1 in and 0.6 m length was filled with Protruded-packing 0.16 in × 0.16 in. We investigated the effect of operating conditions on overall mass transfer coefficients as well as on CO2 removal efficiency. The loading values reached at about 1.0 molCO2/molTMG. In case of absorbent with lean CO2 loading, the overall mass transfer coefficient was proportional to the concentration of TMG. However, in the range of more than α =0 .5 molCO2/molTMG, the overall mass transfer coefficients decreased with the concentration of TMG. It is due to the increasing of mass transfer resistance in liquid phase as increasing of viscosity at higher loading values.