| 摘要 |
The present invention is a 1,3-butadiene production method that includes: a step in which a product gas containing 1,3-butadiene is obtained by subjecting a raw material gas containing n-butene, and a gas containing molecular oxygen to a oxidative dehydrogenation reaction in the presence of a metal oxide catalyst; a step in which the product gas is cooled; and a step in which the cooled product gas is crudely separated, by selective absorption to an absorptive solvent, into molecular oxygen and inert gas types, and other gases. In the product gas, the N2 concentration is 35-90 vol% inclusive, the H2O concentration is 5-60 vol% inclusive, and the 1,3-butadiene concentration is 2-15 vol% inclusive. The absorptive solvent contains acetonitrile as a main component. |
