Method of producing aromatic hydrocarbons

A method of producing aromatic hydrocarbons, the method comprising:

• a step of supplying a first raw material stream to a C6 separation column, supplying an upper discharge stream from the C6 separation column to a first gasoline hydrogenation unit, and supplying a lower discharge stream from the C6 separation column to a C7 separation column;
• a step of supplying an upper discharge stream from the C7 separation column to a hydrodealkylation reaction unit and supplying a lower discharge stream from the C7 separation column to a C8 separation column;
• a step of separating benzene from a discharge stream of the first gasoline hydrogenation unit and a discharge stream of the hydrodealkylation reaction unit;
• a step of removing a lower discharge stream from the C8 separation column and supplying an upper discharge stream from the C8 separation column to a second extractive distillation column;
• and
• a step of separating styrene from a lower discharge stream of the second extractive distillation column and separating xylene from an upper discharge stream of the second extractive distillation column,
• wherein the first gasoline hydrogenation unit is separately supplied with a second raw material stream including a C5 hydrocarbon and a C6 hydrocarbon,
• wherein the second raw material stream supplied to the first gasoline hydrogenation unit is different from the first raw material stream and does not include styrene;
• and
• wherein the first raw material stream includes C5 to C10 hydrocarbons.