Method for production of conjugated diolefin

A method for production of a conjugated diolefin, wherein said method comprises the following steps of (1) to (6) in this order:

• step (1):
• a step of supplying a source gas containing a C4 or higher monoolefin and an oxygen-containing gas into a reactor to form a gas mixture and bringing a catalyst into contact with the gas mixture to obtain a gas containing a conjugated diolefin by an oxidative dehydrogenation reaction,
• step (2):
• a step of cooling the gas containing the conjugated diolefin in a quench column,
• step (3):
• a step of allowing the gas containing the conjugated diolefin to be absorbed in a solvent, subsequently stripping the gas containing the conjugated diolefin from the solvent, followed by compressing the gas to obtain a liquefied gas, wherein the solvent for absorbing the gas containing the conjugated diolefin is toluene, m-xylene, o-xylene, p-xylene, or mixed xylene,
• step (4):
• a step of rinsing the liquefied gas with water,
• step (5):
• a step of removing the water from the liquefied gas by distillation, and
• step (6):
• a step of removing a high boiling component from the liquefied gas, wherein
• in the step (1), an oxygen concentration of the gas containing the conjugated diolefin is in a range of 0.01 to 2.0% by volume.