Method of separating normal butene using isomerization and process system for separating normal butene

A separation system for recovering normal butene from an olefin fraction, the separation system comprising:

• a supply unit that supplies a reactant including an olefin fraction;
• a processing unit connected to the supply unit, in which a single distillation column is disposed, the distillation column including:
• at least one isomerization reaction zone;
• at least one distillation zone;
• an overhead discharge line;
• and
• a bottom discharge line;
• and
• a recovery unit that is connected to the processing unit and recovers a reaction product, the recovery unit comprising a heat exchanger, a top fraction recovery unit connected to the overhead discharge line of the distillation column to recover a top fraction, and a bottom fraction recovery unit connected to the bottom discharge line of the distillation column to recover a bottom fraction, the heat exchanger refluxing each of the top fraction and the bottom fraction without the use of a separate reflux system comprising a condenser and reboiler.