Methods and systems for producing para-xylene from c8-containing compositions

A system for producing para-xylene (PX) from a C8 aromatic-containing composition, the system comprising:

• a xylene rerun column operable to separate the C8 aromatic-containing composition into a xylene-containing effluent and a heavy effluent, the xylene-containing effluent comprising at least PX and one or more of ortho-xylene (OX), meta-xylene (MX), ethylbenzene (EB), or combinations of these;
• and
• a xylene processing loop comprising:
• a PX recovery unit operable to separate the xylene-containing effluent into at least a PX product and a PX-depleted effluent;
• a membrane isomerization unit operable to convert at least a portion of the MX, OX, EB, or combinations of these from the xylene-containing effluent to PX;
• an ethylbenzene dealkylation unit operable to dealkylate at least a portion of the EB from the xylene-containing effluent to produce one or more C7− compounds;
• and
• a membrane separation unit operable to separate at least a portion of the xylene-containing stream into a permeate that is PX-rich and a retentate that is PX-lean.