Process for hydrogenation of phthalate compound

A hydrogenation method of a phthalate-based compound, the method comprising:

• the step of injecting, into a reactor, a gas-phase raw material including hydrogen and a liquid-phase raw material including the phthalate-based compound;
• the step of performing a hydrogenation reaction of the gas-phase raw material and the liquid-phase raw material in the presence of a catalyst in the reactor;
• a first decompression step of separating and decompressing, in a first gas-liquid separator, a first solution and the gas-phase material containing hydrogen from the reaction product after the reaction step;
• and
• a second decompression step of separating and decompressing, in a second gas-liquid separator, a second solution and the gas-phase material containing hydrogen from the first solution discharged from the lower part of the first gas-liquid separator,
• wherein an operating pressure of the first gas-liquid separator is 100 barg to 200 barg,
• wherein a pressure of the gas-phase material discharged from the upper part of the first gas-liquid separator is 5 barg to 50 barg,
• wherein an operating pressure of the second gas-liquid separator is 5 barg to 100 barg,
• wherein a pressure of the gas-phase material discharged from the upper part of the second gas-liquid separator is 5 barg to 50 barg,
• wherein a pressure of the second solution discharged from the lower part of the second gas-liquid separator is-1 barg to 25 barg,
• wherein a concentration of hydrogen in the second solution discharged from the lower part of the second gas-liquid separator is 0.005% by weight to 0.1% by weight.