Reformate splitting in one dividing-wall shell

A catalytic-reformer stream split into benzene/lights, a toluene side draw and xylene bottoms by three thermally-coupled MESH sections solved together.

Rigorous dividing-wall column — three coupled MESH sections, one solve•Three on-spec aromatics cuts from a single shell•After Dejanovic et al., Ind. Eng. Chem. Res. 2011, 50, 5680

Reformate

Dividing-wall column

Benzene / lights

Toluene side draw

Xylene bottoms

The actual dark-mode canvas: a catalytic-reformer stream split into a benzene/lights overhead, a toluene side draw, and a xylene bottoms in one thermally-coupled dividing-wall shell — the duty two ordinary columns in series would otherwise need.

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One shell, three coupled MESH sections

The rigorous dividing-wall model solves the prefractionator and both main-column sections simultaneously through their vapour and liquid interlinks — so the vapour split across the wall is a solved variable that trades the three product purities against each other, which is the whole design difficulty a shortcut model hides.

L_{n-1} + V_{n+1} + F_n = L_n + V_n \quad \text{(MESH in each of the three coupled sections)}

\text{prefractionator} \;\rightleftharpoons\; \text{main column} \quad \text{(two thermally-coupled vapour/liquid interlinks, solved simultaneously)}

Q_{\text{reb}}^{\,\text{DWC}} < Q_{\text{reb}}^{\,\text{col 1}} + Q_{\text{reb}}^{\,\text{col 2}} \quad \text{(the energy case for one shell instead of two)}

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Dividing-wall column (rigorous)

Three thermally-coupled MESH columns solved as one shell — three on-spec cuts from a single tower.

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Live plant integration

Stream the wall-section vapour split, side-draw rate, and reboiler duty from the aromatics plant's OPC-UA server into this flowsheet's twin comparison — a DWC operating away from its solved split is exactly the deviation that quietly erases the column's energy advantage.

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