Abstract: The invention is directed to a process to produce para-xylene and optionally, ortho-xylene, including coupling a C9+-aromatics-removal system with an isomerization system or with a parallel configuration of two isomerization systems to reduce xylenes recycle for energy savings and/or productivity increases.

Abstract: The invention is directed to a process to produce para-xylene and optionally, ortho-xylene, including coupling a C9+-aromatics-removal system with an isomerization system or with a parallel configuration of two isomerization systems to reduce xylenes recycle for energy savings and/or productivity increases.

Abstract: The invention relates to the integration of plural processes around a single device. The plural processes are characterized by having at least two separate and distinct feedstreams, two separate and distinct products, or a combination thereof.

Abstract: A process and an apparatus for the separation of a feed by distillation into a low-boiler (A), a medium-boiler (B) and a high-boiler fraction (C). Separation takes place in one or more dividing-wall columns, in which a dividing wall is arranged in the longitudinal direction of the column to thereby form an upper, common column region, a lower, common column region, a feed part with rectifying section and stripping section, and a withdrawal region with rectifying section and stripping section. The feed of the C5+ cut is in the central region of the feed part. The high-boiler fraction (C) is discharged from the bottom of the column, the low-boiler fraction (A) is discharged via the top of the column, and the medium-boiler fraction (B) is discharged from the central region of the withdrawal part. A first heat source is provided for heating the lower column region.