Application of a bottom divided wall column (BDWC) with and without vapor recompression (VRC) to separate aromatic rich streams from the pyrolysis gasoline hydrogenation reactor

Abstract

Systems and process for separating a hydrotreated pyrolysis gasoline include feeding a hydrotreated pyrolysis gasoline to a divided wall distillation column. The divided wall distillation column includes: a bottom dividing wall segregating a lower portion of the column into a first side and a second side, wherein the hydrotreated pyrolysis gasoline is fed to the first side; and an upper separation zone receiving vapor from both of the first side and second side and providing liquid to both of the first side and second side. The divided wall distillation column is configured to separate the hydrotreated pyrolysis gasoline to recover an overheads fraction comprising C6 hydrocarbons, separate the hydrotreated pyrolysis gasoline in the first side to recover a first bottoms fraction comprising C9 and heavier hydrocarbons, and separate, in the second side, liquid received from the upper separation zone to recover a second bottoms fraction comprising C7 - C8 hydrocarbons.

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