PTFE Redistributor

Liquid running down a packed column does not stay evenly spread. It migrates to the wall, where it finds the path of least resistance and runs straight past the packing — channeling. The centre of the bed goes dry, the wall film does no separating work, and the column quietly stops performing to its rating. The catalogue puts the item's purpose plainly: the PTFE redistributor is used to prevent channeling in a column.

It works by interrupting that wall film. Fitted at the joint between two column sections, the redistributor catches the liquid running down the wall and returns it to the centre of the bed below, so the next section starts with the flow spread across its full area again. On a tall column, one is fitted every few sections — the taller the packed height, the more times the flow needs collecting and re-spreading.

The catalogue is specific about the fit: it can be clamped between two column sections without using any gasket. The PTFE seats directly on the glass, so the redistributor adds nothing to the joint stack and needs no separate sealing element.

Eight references cover DN 80 to DN 600 — the widest span in this range. DN is the column diameter, d the central opening the redistributed liquid falls through, and L the height of the unit, 20 mm on the small sizes rising to 30 mm at DN 450 and DN 600.