A separate collector typically is used in applications that have one or more of the following requirements.
- Distillation services with high stage count per bed
- High purity product distillation systems
- Distillation services operating near the minimum reflux ratio or close to an equilibrium pinch
- Absorption or stripping applications with close approach to equilibrium
A separate collector requires more column height than a channel or deck-type redistributor.
When used between packed beds for redistribution, a trough-type distributor requires a collector to catch the liquid from the bed above.
Factors to consider when choosing the style of liquid collector:
- Pressure drop limitation
- Thermal expansion
- Leakage limitations
- Field welding