Operating lines in cascade separation of binary mixtures

The general case of cascade operation is treated without any restriction on the value of the separation factor. Equilibrium curves are briefly discussed. These are generally a function of the cut. The equations of operating lines for both of enriching and stripping sections are derived for the general case by appropriate material balances. Also, three specific applications are presented in detail, by showing graphical constructions and discussing characteristic features for each case. Le cas general d'operation cascade est traite sans aueune restriction sur la nature du facteur de separation. On dis-cute brievement les courbes d'equilibres. On derive pour ce cas general, a l'aide de bilans materiels, les equations des lignes d'operation pour les sections d'enrichissement et d'epuration. On presente, di plus, trois applications specifiques avec construction gra-phique et discussion des points characteristiques pour chaque cas.