Method for producing butadiene
A method for producing butadiene comprises a step of obtaining a product gas containing butadiene, by feeding a raw-material gas containing straight-chain butene and an oxygen-containing gas containing molecular oxygen to a reactor and performing oxidative dehydrogenation reaction in the presence of a catalyst, wherein the catalyst comprises a composite oxide containing molybdenum and bismuth, and the concentration of hydrocarbons having 5 or more carbon atoms in the raw-material gas is 0.05 mol % to 7.0 mol %.
1. 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.
2. The method according to claim 1 , wherein the amount of hydrocarbons having 5 or more carbon atoms in the raw-material gas is in the range of 0.2-6.0 mol %.
3. The method according to claim 1 , wherein the concentration of the straight-chain butene in the raw-material gas is 60 mol % or more.