Overview
The Absorption in Wetted Wall Column apparatus uses a precisely defined geometry of a falling liquid film on the inner wall of a vertical tube with gas flowing co-currently or counter-currently through the core. The well-defined hydrodynamics of this geometry allow accurate determination of liquid-phase and gas-phase mass transfer coefficients without the complexity of packing. Students determine the mass transfer coefficient as a function of liquid and gas flow rates, compare experimental results with penetration theory predictions, and study the effect of concentration driving force on absorption rate. The wetted wall column is a fundamental research instrument for measuring interfacial mass transfer rates.
Specifications
| Column | glass tube, vertical |
| Column diameter | 25 to 50 mm |
| Column length | 500 to 1000 mm |
| Liquid film | water flowing down inner wall |
| Gas | CO2 or SO2 in air (counter-current) |
| Flow measurement | precision rotameters |
| Gas analysis | CO2 analyser |
| Power supply | 220V AC, 50 Hz |