Method for separating normal paraffin and isoparaffin from hydrocarbon oil

A method for separating normal paraffin and isoparaffin from raffinates of a benzene, toluene, and xylene (BTX) reforming process including C5 to C8 light naphtha, the method comprising:

• a liquid hydrogenation process for removing olefin by feeding raffinates in which hydrogen is dissolved into a reactor filled with a hydrogenation catalyst, and
• after the liquid hydrogenation process, an adsorption step for separating normal paraffin and isoparaffin is performed,
• wherein the liquid hydrogenation process is performed under conditions satisfying Equations 1 and 2 below:
• 16≤A1/A2≤35 [Equation 1]
• 1.5≤A3/A24≤2.5 [Equation 2]
• wherein in Equations 1 and 2,
• A1 is a space velocity (Hr−1) of reactants in the reactor,
• A2 is a ratio of a molar amount of dissolved hydrogen gas with respect to a molar amount of olefin in the raffinates in which hydrogen is dissolved,
• A3 is a space velocity (Hr−1) of the raffinates in which hydrogen is dissolved in the reactor, and
• the reactants in the reactor are a mixture of the raffinates in which hydrogen is dissolved and a mixture that is recycled from a downstream part of the process to said reactor of the liquid hydrogenation process.