Split-shell fractionation columns and associated processes for separating aromatic hydrocarbons

A process for separating aromatic hydrocarbons, comprising the steps of:

• introducing a first stream comprising a plurality of aromatic hydrocarbons into a first distillation zone of a split-shell fractionation column;
• introducing a second stream comprising a plurality of aromatic hydrocarbons into a second distillation zone of the split-shell fractionation column, the first and second distillation zones being defined by a partition within the split-shell fractionation column, the partition having a gap region therein;
• separating the first stream into a first overhead product and a first bottom product, wherein the first bottom product comprises a first liquid that collects at a bottom portion of the first distillation zone;
• separating the second stream into a second overhead product and a second bottom product, wherein the second bottom product comprises a second liquid that collects at a bottom portion of the second distillation zone;
• draining the first liquid, the second liquid, or a combination thereof in the gap region through a first outlet port.