Process and device for the inverted separation of aromatics
AssigneeAxens
InventorsJérôme PIGOURIER, Isabelle PREVOST
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Abstract
The present invention relates to a process and to a device for the separation of a feedstock comprising benzene, toluene and C8+ compounds, in which: a toluene column (C10) is fed directly with a C7+ cut resulting from the bottom of a stabilization column (C11) positioned downstream of a transalkylation unit (P4); a C7− cut is withdrawn at the top of the toluene column (C10) and a C8+ cut is withdrawn at the bottom; a benzene column (C9) is fed with the C7− cut resulting from the toluene column (C10); an essentially aromatic cut resulting from an aromatics extraction unit (P1) is injected into the toluene column (C10) separately above the feeding of the C7+ cut or into the benzene column (C9).
Claims15
Process for the separation of a feedstock comprising benzene, toluene and compounds having 8 or more carbon atoms, in a separation device comprising at least one reformate column (C1), one aromatics extraction unit (P1) and one transalkylation unit (P4), the effluents from the units being separated in the following distillation columns:
- benzene column (C9), toluene column (C10) and stabilization column (C11), the process comprising the following stages:
- the toluene column (C10) is fed directly with a C7+ cut resulting from the bottom of the stabilization column (C11) positioned downstream of the transalkylation unit (P4) in order to withdraw a top product from the toluene column (C10) enriched in benzene and in toluene and a bottom product from the toluene column (C10) enriched in compounds having 8 or more carbon atoms,
- the benzene column (C9) is fed with the top product from the toluene column (C10) in order to withdraw a benzene-enriched top product from the benzene column (C9) and a toluene-enriched bottom product from the benzene column (C9), and
- the transalkylation unit (P4) is fed with the toluene-enriched bottom product from the benzene column (C9),
- in which the toluene column (C10) is fed with an essentially aromatic cut resulting from the aromatics extraction unit (P1), the feeding of the toluene column (C10) resulting from the aromatics extraction unit (P1) being carried out separately from and above the feeding of the toluene column (C10) resulting from the bottom of the stabilization column (C11), or
- in which the benzene column (C9) is fed with the essentially aromatic cut resulting from the aromatics extraction unit (P1) as a mixture with or separately from the top product from the toluene column (C10).
Device for the separation of a feedstock comprising benzene, toluene and compounds having 8 or more carbon atoms, the separation device comprising at least one reformate column (C1), one aromatics extraction unit (P1) and one transalkylation unit (P4), the separation device additionally comprising the following columns for the distillation of the effluents from the units:
- benzene column (C9), toluene column (C10) and stabilization column (C11),
- the toluene column (C10) being appropriate for being fed with a C7+ cut resulting from the bottom of the stabilization column (C11) positioned downstream of the transalkylation unit (P4) and for delivering a top product from the toluene column (C10) enriched in benzene and in toluene and a bottom product from the toluene column (C10) enriched in compounds having 8 or more carbon atoms,
- the benzene column (C9) being appropriate for being fed with the top product from the toluene column (C10) and for delivering a benzene-enriched top product from the benzene column (C9) and a toluene-enriched bottom product from the benzene column (C9), and
- the transalkylation unit (P4) being appropriate for treating the toluene-enriched bottom product from the benzene column (C9),
- in which the toluene column (C10) is appropriate for being fed with an essentially aromatic cut resulting from the aromatics extraction unit (P1), the feeding of the toluene column (C10) resulting from the aromatics extraction unit (P1) being carried out separately from and above the feeding of the toluene column (C10) resulting from the bottom of the stabilization column (C11), or
- in which the benzene column (C9) is appropriate for being fed with the essentially aromatic cut resulting from the aromatics extraction unit (P1) as a mixture with or separately from the top product from the toluene column (C10).
Dependencies are inferred from the claim text.