Rate-based packed absorber simulation

gas + liquid -> gas + rich liquid

Governing equations

The exact equations the solver works for a rate-based packed absorber — the same math shown in the app's "Theory" panel, not a black box.

$Z$

packed height [m] — the design variable here, in place of a stage count

$a_w$

wetted interfacial area per unit volume [m²/m³] (Onda correlation)

$k_G$

gas-film mass-transfer coefficient

$k_L$

liquid-film mass-transfer coefficient

$u_G$

superficial gas velocity [m/s]

$u_L$

superficial liquid velocity [m/s]

$N_G$

gas-film transfer units over the packed height

$N_L$

liquid-film transfer units

$N_{OG}$

overall gas-phase transfer units — both films combined; the rate-based analog of a stage count

$Ha$

Hatta number — how fast the liquid-phase reaction is relative to diffusion

$E$

enhancement factor — how much the reaction speeds up liquid-side transfer (1 = no reaction, →Ha for a fast one)

$k_2$

second-order reaction rate constant [m³/mol/s]

$C_{amine}$

amine concentration in the liquid [mol/m³]

$D_L$

liquid diffusivity [m²/s]

$A$

absorption factor L/(KV), same meaning as the Kremser absorber

$\varphi$

fraction of the entering solute absorbed [0..1] (Colburn)

Parameters

packed_height [m, >0], packing [str, optional], pressure [Pa], temperature [K, optional], rate_constants {component: k2 [m^3/mol/s], optional}, superficial_gas_velocity [m/s, optional] — rate-based packed absorber (Onda mass transfer + reaction enhancement + reactive VLE); two inlets: a gas and a liquid solvent

Example flowsheets that use it