Method for producing butadiene

A method for producing butadiene, comprising:

• providing a raw material gas comprising straight-chain butene and an oxygen-containing gas comprising molecular oxygen,
• adding hydrocarbons having 5 or more carbon atoms to the raw material gas or adjusting the amount of hydrocarbons having 5 or more carbon atoms in the raw material gas to obtain an amount of hydrocarbons having 5 or more carbons atoms in the raw material gas in the range of 0.2-7.0 mol %, and
• performing oxidative dehydrogenation reaction of the raw material gas with the oxygen-containing gas in a reactor and in the presence of a catalyst to produce a product gas comprising butadiene,
• wherein:
• the catalyst comprises a composite oxide containing molybdenum and bismuth;
• the concentration of isobutene in the raw material gas is 1.0 mol % or less;
• the concentration of butadiene in the raw material gas is 1.0 mol % or less;
• and
• the amount of hydrocarbons having 5 or more carbon atoms in the raw material gas allows dissolving by-products of the oxidative dehydrogenation reaction and prevents reactor blockage.