Decanter simulation

1 liquid inlet -> light + heavy liquid (LLE)

Governing equations

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

$z_i$

overall feed mole fraction of component i

$x_i^{I}, x_i^{II}$

mole fractions in the light (I) and heavy (II) liquid layers

$\gamma_i^{I}, \gamma_i^{II}$

UNIFAC activity coefficients in each layer — equal activities, not equal compositions, is what equilibrium means here

$\beta$

fraction of the feed reporting to the heavy phase [0..1]

$T, P$

temperature [K] and pressure [Pa] — unchanged; a decanter separates, it does not heat or drop pressure

Parameters

(no params) — the split is purely thermodynamic: an isothermal UNIFAC liquid-liquid flash at the feed's own T and P. Outlets/edges in order: light, heavy (by density). A feed that does not split passes through as the heavy phase with a warning.

Example flowsheets that use it