๐ญ Absorption Column Design โ Packed Bed Calculator
Size packed-bed gas absorption columns using Henry's law equilibrium, Kremser theoretical-stage estimate, and the NTU-HTU height method.
๐ซง Countercurrent Packed-Bed Absorber Schematic
๐ Configuration
Key Equations:
Henry equilibrium: y* = m x
Absorption factor: A = L/(mG)
Kremser estimate: N = ln[(yin-y*in)/(yout-y*out)] / ln(A)
NTU-HTU: Z = HTUOG ร NTUOG, HTUOG = G'/(KGa)
Henry equilibrium: y* = m x
Absorption factor: A = L/(mG)
Kremser estimate: N = ln[(yin-y*in)/(yout-y*out)] / ln(A)
NTU-HTU: Z = HTUOG ร NTUOG, HTUOG = G'/(KGa)
๐ Results & Visualization
Configure inputs and click Calculate to view results.
โน๏ธ About Packed-Bed Absorption
This tool sizes a countercurrent packed absorber from equilibrium and operating-line data. It combines a theoretical-stage estimate with a continuous-contact NTU-HTU height calculation.
This tool sizes a countercurrent packed absorber from equilibrium and operating-line data. It combines a theoretical-stage estimate with a continuous-contact NTU-HTU height calculation.
๐ Calculation Methodology
Mathematical Model & Theory
The absorber is modeled as countercurrent gas-liquid contact. Henry's law provides linear equilibrium y* = m x. The operating line is obtained from solute balance. NTU is evaluated by numerical integration of dy/(y-y*) along the column.
Worked Engineering Example
COโ absorption example: gas enters with y = 0.10 and exits at y = 0.02. With lean solvent x = 0, Henry slope m = 1.25, and L/G = 2.2, the code calculates absorption factor A, Kremser stages, NTU, HTU, and required packing height.
Assumptions & Notes
- Dilute solute and constant molar gas/liquid flow rates.
- Linear Henry law equilibrium: y* = m x.
- Overall gas-phase volumetric coefficient KGa is supplied by user.
- No flooding, pressure drop, heat effects, foaming, maldistribution, or chemical reaction included.
- Use vendor packing data and hydraulic checks for final design.