RECYCLE STRUCTURE FOR SINGLE REACTION SYSTEM Vapor phase recycle Purge Products fresh Reaction Separation eel System System B products Liquid phase recycle 11/29/99 Recycle structure11/29/99 Recycle Structure 2 Reaction System Separation System Purge Products Byproducts Liquid Phase Recycle Vapor Phase Recycle Fresh Feed RECYCLE STRUCTURE FOR SINGLE REACTION SYSTEM