Among CO2 capture technologies, Calcium Looping (CaL) process is one of the most promising, especially for post-combustion capture. Process simulation models are very helpful not only for the deeper comprehension of the capture mechanisms but also for designing large scale units. Computational Fluid Dynamics (CFD) modelling aim to simulate the multi-phase flow inside the reactors providing useful information about hydrodynamic characteristics, solid spatial distribution and recirculation rate. The sophisticated CFD modeling approach includes a) the implementation of the more accurate EMMS scheme for the calculation of the drag force acting on the inert particles by the gas flow; b) full – loop simulation and c) the Pitman - Schaeffer - Gray – Stiles yield criterion for the formulation of the stress tensor of granulates inside the recirculation system. On the other hand, process models directly address the rate of reaction, the amount of CO2 that is captured, energy and mass balance. In general terms, the effect of hydrodynamics is neglected or is taken into account through empirical or semi – empirical models. This study presents an integrated model for the Carbonator reactor that couples advanced CFD and process simulation techniques. Such a sophisticated model is a powerful design tool for process scale – up. In order to achieve this coupling the following methodology is proposed: carbonator hydrodynamics are resolved through CFD simulations and the predicted solids distribution is introduced to the process model. Particle loading is retrieved through proper extrapolation of CFD results. Prior to application of the model to large scale carbonators, the integrated model is validated against data derived by an experimental campaign at DIVA CFB carbonator of IFK (USTUTT). Predictions for CO2profile along the riser and CaO mean conversion in the bed where compared with the respective experimental data.