Packed Column Design Calculator

About Packed Columns

Packed columns use structured or random packing instead of trays for vapor-liquid contact. They offer advantages in pressure drop, liquid holdup, and turndown capability compared to tray columns.

Packing Types

• Random Packing: Dumped in bulk, lower cost, easier installation
• Structured Packing: Engineered geometry, higher efficiency, lower ΔP
• Metal: Higher capacity, better for high pressure
• Ceramic/Plastic: Corrosion resistant, lower cost

Design Guidelines

• Flooding: Design for 70-80% of flood velocity
• Turndown: 3:1 to 5:1 typical
• Minimum Wetting: 3-5 gpm/ft² for random packing
• ΔP: 0.2-0.5 in H₂O/ft typical

Advantages vs. Trays

• Lower pressure drop (important for vacuum service)
• Better turndown capability
• Lower liquid holdup (important for corrosive/reactive systems)
• Can handle solids better (structured packing)

Disadvantages vs. Trays

• More difficult to predict performance
• Liquid distribution critical
• Inspection and maintenance more difficult
• Can be more expensive (structured packing)