Batch still (Rayleigh) simulation

charge -> distillate + bottoms, averaged over the cycle

Governing equations

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

$B_0$

charge to the pot [mol]

$B$

pot inventory at the stop point [mol]

$x_0$

light-key fraction in the charge

$x_B$

light-key fraction left in the pot

$x_D$

accumulated average distillate composition

$y(x)$

vapour in equilibrium with a pot of composition x

Parameters

light_key + heavy_key [component ids]; a stop condition — fraction_distilled OR final_still_composition [light-key mole fraction left in the pot]; batch_time [s]. Optional: turnaround_time [s], pressure [Pa], relative_volatility [constant alpha for a screening pass — omit to use the flowsheet's own VLE], vle_points [resolution of the tabulated equilibrium curve, default 41].

Example flowsheets that use it