Overview
The Absorption in Packed Bed apparatus uses a glass column packed with random packing (Raschig or Pall rings) through which a gas stream containing a soluble component is passed counter-currently against a descending liquid solvent. The large wetted surface area of the packing provides efficient gas-liquid contact for absorption. Students measure inlet and outlet gas concentrations, liquid flow rate, and pressure drop to calculate HTU, NTU, KGa (volumetric mass transfer coefficient), and flooding velocity. The packed bed absorber is the most widely used gas-liquid contactor in chemical engineering for acid gas removal, ammonia scrubbing, and emission control.
Specifications
| Column type | glass, random packed bed |
| Packing | Raschig rings / Pall rings |
| Column diameter | 50 to 80 mm |
| Packing height | 600 to 1000 mm |
| Gas | CO2 / NH3 / SO2 diluted in air |
| Liquid | water / NaOH |
| Gas analyser | NDIR or wet chemical |
| Power supply | 220V AC, 50 Hz |