Axens

Arnaud Cotte

Isabelle Prevost

Jerome Pigourier

Pierre-Yves Martin

Nicolas Pupat

Jérôme Pigourier

Jérôme M Pigourier

The present invention relates to a process for producing high-purity para-xylene, comprising a single step of separation by adsorption in an SMB, with a subsequent step of separation by distillation in a first three-fraction distillation column producing at least two raffinates and optionally of two isomerization steps, making it possible to improve the overall para-xylene yield of the aromatic loop and to minimize the economic impact.

Process for producing para-xylene using a step in a simulated moving bed and a step of fractionation via a three-fraction column

The present invention relates to a process and a device for separating a feedstock comprising benzene, toluene and C8+ compounds, by means of at least one 'reformate' distillation column (C), one aromatics extraction unit (P), one para-xylene separation unit (P), one xylene isomerization unit (P) and one transalkylation unit (P), the effluents of said units being separated in the following distillation columns: purification column (C), deheptanizer (C) and toluene column (C), in which at least one of said distillation columns is suitable for being operated under vacuum so that: the majority of the C7&#x2212; compounds are recovered in the product at the top of the distillation column operated under vacuum, and the majority of the C8+ compounds are recovered in the product at the bottom of the distillation column operated under vacuum.

Process and device for separating aromatics under vacuum

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Rueil-Malmaison, France

Arnaud Cotte