Rapid screening of 4-step VSA/PVSA cycles for binary CO2/N2 separation:
a well-mixed, isothermal batch adsorber at instantaneous equilibrium
(Subramanian Balashankar et al. 2019; e-BAAM extensions of Liske & Rajendran 2026).
The whole cycle reduces to one composition-path ODE plus algebraic balances — no CSS iteration —
so purity, recovery, energy and working capacity respond instantly to the three design pressures
PH > PINT > PLOW, and the cycle can be drawn directly on the competitive isotherms.
Adsorbent & competitive equilibrium
Own material? Pick Custom above and either type dual-site Langmuir parameters, or switch the
mixture model to IAST — that route takes any pair of pure isotherms from the same 11-model menu as the IAST app
(Langmuir, Sips, Toth, BET/GAB, UNILAN, … or a free q(p) expression) and solves the mixture by ideal adsorbed solution theory.
CO₂ (component A)
N₂ (component B)
CO₂ — pure isotherm qA(p) [mol/kg], p [bar]
N₂ — pure isotherm qB(p) [mol/kg], p [bar]
Presets: 2019 paper set (dual-site Langmuir, Table 1) and e-BAAM set (single-site refits; CALF-20 dual-site).
Isotherm parameters are concentration-based: b(T) = b₀e−ΔU/RT, ci = Pyi/RT.
The IAST route accepts any pair from the IAST app’s isotherm menu (partial-pressure basis) and computes the
mixture by ideal adsorbed solution theory with finite-difference partials — slower but fully general.
Basis: 1 kg adsorbent; column volume V = w/(ρs(1−ε)).