Absorption Tower Calculator

An absorption tower (or packed column) is an industrial vessel used to transfer a gas-phase contaminant into a liquid solvent — and sizing it correctly prevents flooding, excessive pressure drop, and poor efficiency. Enter your liquid flowrate, gas flowrate, liquid density, gas density, liquid viscosity, and packing factor, then select your packing type and what you want to calculate — diameter, % flooding, or pressure drop — to get the primary result alongside flooding velocity, actual gas velocity, and column cross-sectional area.

cP
ft⁻¹

Results

Calculated Value

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Flooding Velocity

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Actual Gas Velocity

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Column Cross-sectional Area

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Frequently Asked Questions

What is the difference between diameter, flooding percentage, and pressure drop calculations?

Diameter calculation determines the required column size for given flow conditions. Flooding percentage shows how close the operation is to flooding limits (should be 70-80%). Pressure drop calculates the energy loss through the packing.

How do I choose the right packing type for my absorption tower?

Smaller packing (1/4" to 1/2") provides higher efficiency but higher pressure drop. Larger packing (1" to 1.5") has lower pressure drop but lower efficiency. Choose based on your process requirements and economics.

What is packing factor and how does it affect tower design?

Packing factor is a characteristic parameter of each packing type that affects pressure drop and flooding calculations. Higher packing factors indicate higher resistance to flow and typically require larger tower diameters.

What flooding percentage should I target for my absorption tower?

Optimal flooding percentage is typically 70-80% for most applications. Operating below 70% may result in oversized equipment, while above 80% increases risk of flooding and reduced efficiency.

How accurate are these calculations for real-world applications?

The calculations use industry-standard correlations like the Strigle modified Eckert's GPDC. They provide good estimates for preliminary design, but final design should include safety factors and be verified with pilot testing.

Can I use this calculator for distillation columns as well?

Yes, the same principles apply to distillation columns with packed sections. However, ensure you use appropriate vapor and liquid properties for your specific distillation system.

What liquid viscosity range is suitable for packed towers?

Packed towers work well for low to moderate viscosity liquids (typically 1-100 cP). For high-viscosity liquids above 100 cP, consider tray columns or specialized packing designs.

How do I convert between different unit systems?

The calculator allows you to select different unit combinations. For manual conversion: 1 lb/ft³ = 16.02 kg/m³, 1 inch = 25.4 mm, 1 ft/s = 0.3048 m/s. Always ensure consistent units in your calculations.