Pressure Swing Adsorption (PSA) simulation

1 feed -> product + tail_gas (real 2-bed cyclic pressure-swing process)

Governing equations

The exact equations the solver works for a pressure swing adsorption (psa) — the same math shown in the app's "Theory" panel, not a black box.

$q_i$

adsorbed loading of i [mol/kg]

$q_i^{eq}$

equilibrium loading the bed is chasing at the current partial pressure

$q_{max,i}$

monolayer capacity [mol/kg]

$b_i$

Langmuir affinity [1/Pa]

$p_i$

partial pressure of i [Pa]

$k_{LDF,i}$

linear-driving-force rate constant [1/s] — how fast the bed approaches equilibrium; this is what makes it a *cycle* and not a single flash

$p_{high}$

adsorption pressure

$p_{low}$

regeneration pressure — the swing between them is the whole separation

Parameters

isotherms {component: {q_max, b}}, adsorbent_mass_per_bed [kg], bed_void_volume [m3], n_stages, p_high/p_low [Pa], step_time [s], optional ldf_k {component: [1/s]}, purge_fraction, n_cycles — real 2-bed cyclic pressure-swing adsorption

Example flowsheets that use it