Publishable summary: This work presents the development of a Computational Fluid Dynamics (CFD) model for a hydrochloric acid (HCl) concentrator. Using a mixture of calcium chloride (CaCl2) and sulfuric acid (H2SO4), the goal is to produce concentrated HCl and calcium sulfate (CaSO4). Due to the process’s complexity, components such as agitation, mixing of liquid and gas phases, and chemical reactions were individually modeled before integrating them into a single model. Despite challenges in the complete integration due to complex interactions and numerical stability, the obtained results provide a solid foundation for future research. In the first version of the deliverable the model of the other unit involved in Escombreras was developed.