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Liquid Collector Tray

A liquid collector tray, also known as a collection or draw-off tray, is a component used in distillation columns and other process vessels to collect and remove liquid products from the column. Its primary function is to separate the liquid phase from the vapor phase and direct the liquid to downstream processing or storage, while allowing the vapor to continue rising through the column. Liquid collector trays are important for maintaining separation efficiency and ensuring the proper operation of the column.

Liquid Collector Tray

1. Weir-Type Liquid Collector: This design features a raised rim around the tray’s perimeter. Liquid collects in the space surrounded by the weir and is directed toward the outlet.
2. Pan-Type Liquid Collector: This design includes a shallow pan-like structure with a central outlet. Liquid accumulates in the pan and flows toward the outlet.
Maintenance:
• Regular inspection and maintenance are essential to ensure that the outlets and drains are clear of debris, which could obstruct the flow of liquid from the tray.

Design and Operation:
• A liquid collector tray is typically positioned below one or more higher stages or trays in the distillation column.
• It consists of a flat or sloped plate with a raised rim or a weir around its perimeter. This rim prevents vapor from escaping while allowing liquid to pool on the tray.
• The liquid that accumulates on the tray is then directed to a central outlet or multiple outlets, which lead to downstream processing or storage tanks.
Function:
• As vapor rises through the column, it carries with it vaporized components. When this vapor reaches a stage with a liquid collector tray below, the vapor passes through the tray while the liquid droplets condense and collect on the tray.
• The liquid collector tray ensures that liquid is not carried up with the vapor, which could lead to reduced separation efficiency and product quality issues.
• By providing a controlled area for liquid to accumulate, the tray allows for smooth and controlled drainage of the liquid phase.
Applications:
• Liquid collector trays are used in various distillation processes, including fractionation, absorption, and other separation processes.
• They are particularly crucial in columns with multiple stages, where each stage needs to maintain the desired separation of components.
Types of Liquid Collector Trays:
1. Weir-Type Liquid Collector: This design features a raised rim around the tray’s perimeter. Liquid collects in the space surrounded by the weir and is directed toward the outlet.
2. Pan-Type Liquid Collector: This design includes a shallow pan-like structure with a central outlet. Liquid accumulates in the pan and flows toward the outlet.
Maintenance:
• Regular inspection and maintenance are essential to ensure that the outlets and drains are clear of debris, which could obstruct the flow of liquid from the tray.