liquid collector are mainly used to collect liquid from above packing bed and ensure uniform vapour distribution.it can be designed for total as well as partial draw off. Open area, allowable pressure drop, height of collector, liquid & vapour loads, column diameter and quantity of Liquid draw-off are the main parameters in collector design.
It is sandwich between the body flanges & it is used in for small column Diameter.
The vane blades collect the overhead liquid and direct it into an annular ring, which may then be drawn from the tower or fed to a distributor below. The ring is welded to tower walls. The pressure drop is almost negligible.
In chimney type collector, the gas flow is distributed evenly by means of covered chimneys while downcoming liquid is collected and drawn off through a shaft or pipe. This is used as a liquid collector as well as collector cum distributor. The pressure loss through this type of collector can be relatively high.