The aim of this study is to evaluate the external liquid-to-particle mass transfer coefficient in packed beds of extruded activated carbon particles. The coefficient is evaluated by an experimental method based on the electrochemical study of mass transfer for nickel particles presenting an equivalent granulometry to that of the extruded carbonaceous particles. Structural parameters of the beds are necessary to calculate the mass transfer coefficients: they are determined by measuring the pressure drop through the bed and combining these with a capillary representation of the porous medium. A set of experimental correlating equations of the type Sh(pore) = ARe(pore)(b)Sc(1/3) is proposed. The resulting equations offer an improvement in representing accurately the experimental mass transfer data for beds packed with multisized anisotropic cylinders, compared to those available in the literature.