Method for producing conjugated diene

A method of producing a conjugated diene, comprising:

• preparing a mixture consisting of at least one solvent and an aged solid acid catalyst;
• heating the mixture to a dehydration reaction temperature;
• continuously adding a γ,δ-unsaturated alcohol to the mixture at the dehydration reaction temperature;
• dehydrating the γ,δ-unsaturated alcohol to obtain the conjugated diene and water;
• and
• continuously removing the conjugated diene and the water from the mixture:
• wherein
• a Hammett acidity function (H0) of the aged solid catalyst is −12.2 or less, a BET surface area of the aged solid catalyst is from 20 m2/g to 800 m2/g,
• a total amount of the conjugated diene and water removed from the mixture is 0.8 to 1.2 times the mass of the γ,δ-unsaturated alcohol,
• the at least one solvent is selected from the group consisting of aliphatic hydrocarbons and aromatic hydrocarbons, and
• an amount of the at least one solvent in the mixture is from 80 to 99% by mass.