Kinetics of Reactive Absorption of Carbon Dioxide with Solutions of Aniline in Nonaqueous Aprotic Solvents

Kinetics of reactive absorption of carbon dioxide (CO2) with solutions of aniline in commercial nonaqueous aprotic solvents, namely, acetonitrile, methyl ethyl ketone (MEK), toluene, and m-xylene was studied in stirred cell and model stirred contactor at 303 ± 1 K and atmospheric pressure. CO2 partial pressure was varied from 0.57 to 1 atm, and the concentration of liquid-phase reactant aniline was varied from 0.75 to 5 kmol/m^3. In the case of all four solvents used, the reaction appeared to be first order with respect to CO2. The reaction order with respect to aniline was found to be -0.5, 1, 2, and 2.5 in the case of acetonitrile, MEK, toluene, and m-xylene, respectively. The intrinsic kinetic rate constants at 303 ± 1 K were found to be 1.40 × 10^2 (kmol/m^3)^0.5/s, 4.90 × 10^-1 1/ ((kmol/m^3) s), 2.02 × 10^-1 1/((kmol/m^3)^2 s), and 2.45 × 10^-2 1/((kmol/m^3)^2.5 s), in the case of acetonitrile, MEK, toluene, and m-xylene, respectively, as solvents.