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The use of hydrocyclones for particles separation is widespread due to advantages such as low cost, simple structure, large capacity and low volume. The shape and size of a hydrocyclone has a decisive effect on the internal flow structure of the continuous phase, and therefore, the separation or classification of the dispersed phase [1]. Therefore, in order to improve the equipments performance, several geometrical changes have been studied in the literature for hydrocyclones of different families [2-13].

Hydrocyclones are devices used in solid-liquid, liquid-liquid, and solid-liquid gas separation process applied in several industry fields such as mining, food and petrochemical. With the rising need of diminishing energy consumption and enhancing process efficiency, modifications on these equipments have been proposed in order to elevate their performance. It can be found in literature optimized geometric relations for a hydrocyclone (designated CH11), aiming to conjugate low energy consumption and small cut size diameters. Hence, the purpose of this paper is to study the influence of filtration on CH depending on where the filtering wall is settled (cylindrical or conical part). The main experimental results suggest that the placement of the permeable region (conical or cylindrical parts) influenced the performance of the equipment regarding the main variables. In conclusion, setting a filtering wall brought expressive changes for the separation process.