A PERFORATED-TRAY COLUMN AND A METHOD OF REVAMPING THE SAME

A perforated-tray column wherein each tray comprises downcomer pipes (6) for conveying a downwardly flowing liquid (L) to a next tray, wherein the downcomer pipe includes: a first portion (7) extending above the perforated tray, a second portion (8) extending below the perforated tray towards the next perforated tray, and an end guard (9) to prevent a gasous phase from entering the downward pipe.