Extraction of zinc(II) from model hydrochloric acid solutions was studied in Lewis cell mixing the bulks of both phases and keeping a stable interfacial surface. It was found that Lewis cell experiments, although dynamic in nature, support the extracting of ZnCl₂·2 TBP chlorocomplex from model solutions containing 5 M Cl^- and 0,55 M H⁺. The initial fluxes of zinc(II), HCl, Cl^-, chloride present in the zinc(II) complex and water depend upon the concentration of tributyl phosphate and the mixing rates. The diffusion step in the organic phase gives a higher resistance to the mass transfer than the diffusion step in the aqueous phase. The physical transfer of small water molecules is less sensitive upon the mixing rates than the transfer of bulky zinc(II) chlorocomplex.