A horizontal pulsed solvent extraction column (HPC) has great potential in replacing vertical pul'sed columns (VPC) in the separation of heavy elements in the nuclear industry. Published work examining the performance of the HPC suggests that the mass transfer efficiency for this column is comparable to the VPC, but information on the hydrodynamic characteristics of the HPC is sparse. This paper describes the flow characteristics of the HPC and presents experimental results and correlations for flooding conditions and holdup of the dispersed phase. Correlations obtained for the HPC for these hydrodynamic parameters are compared to published results for the VPC.La colonne pulsCe horizontale (HPC) servant B I'extraction de solvants montre un fort potentiel pour remplacer les colonnes puldes verticales (VPC) dans la sCparation des ClCments lourds dans I'industrie nuclCaire. Les travaux publits examinant la performance de la colonne horizontale suggkrent que I'efficacitC du transfert du matikre pour cette colonne est comparable B celle de la colonne verticale, mais les donnCes sur les caractkristiques de la HPC sont rares. On dicrit dans cet article les caractiristiques d'Ccoulement de la HPC et on prCsente des risultats expkrimentaux et des corrtlations pour des conditions d'engorgement et la rCtention de la phase disperste. Les corrClations obtenues pour la colonne horizontale pour ces parametres hydrodynamiques sont comparCes aux rCsultats publits pour la colonne verticale.Keywords: solvent extraction equipment, pulsed columns, flooding, holdup. olvent extraction is used in the nuclear industry to 417 THE
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