The paper deals with the computational fluid dynamics modelling of carbon dioxide capture from flue gases in the post combustioncapture method, one of the available carbon capture and storage technologies. 30% aqueous monoethanolamine solution was used as a solvent in absorption process. The complex flow system including multiphase countercurrent streams with chemical reaction and heat transfer was considered to resolve the CO2 absorption. The simulation results have shown the realistic behaviour and good consistency with experimental data. The model was employed to analyse the influence of liquid to gas ratio on CO2 capture efficiency. Nomenclature a -surface area, m 2 /m 3 A -cross sectional area of absorber column, m 2 C -molar concentration, kmol/m 3 Cs -constant in Eq. (5) Er -enthalpy source term, W/m 3 F -phase interaction force, N/m 3 P. Niegodajew, D. Asendrych and S. Drobniak g -gravitational acceleration, m/s 2 G -mass flux of gas phase, kg/s h -specific enthalpy, J/kg h l -liquid holdup, m 3 /m 3 J -flux of species diffused, kg/(m 3 s) k f -forward reaction rate constant, m 3 /(kmol s) L -mass flux of liquid phase, kg/s M -molecular weight, kg/kmol MB -momentum sink term in porous zone, N/m 3 p -static pressure, Pa Q -heat flux exchanged between phases, W/m 3 Q -CO2 mass flux, kg/s R -heterogeneous reaction rate, kg/(m 3 s) R -mass source term, kg/(m 3 s) t -time, s T -temperature, K u -velocity, m/s V -volume flux, m 3 /s y -axial coordinate, m Y -mass fraction, kg/kgGreek symbols α -volume fraction, m 3 /m 3 α -CO2 loading, mol CO2/mol MEA λ -thermal conductivity, W/(m K) ε -porosity, m 3 /m 3 η -CO2 capture efficiency, % µ -dynamic viscosity, Pa s ξ -drag coefficient ρ -density, kg/m 3