Hydrocarbon production method and production apparatus

A hydrocarbon production method for producing hydrocarbons from a hydrocarbon mixture containing isoprene, piperylene, a linear hydrocarbon having a carbon number of 5 and including one or fewer carbon-carbon double bonds, and a branched hydrocarbon having a carbon number of 5 and including one or fewer carbon-carbon double bonds, comprising:

• a first extractive distillation step of using a first extractive distillation column to perform extractive distillation of an extractive distillation target including the hydrocarbon mixture or a pretreated hydrocarbon mixture resulting from pretreatment of the hydrocarbon mixture to obtain a fraction (A) in which isoprene and piperylene are enriched and a fraction (B) in which the linear hydrocarbon and the branched hydrocarbon, having lower solubility than isoprene and piperylene in an extractant used in the extractive distillation, are enriched;
• a first distillation step of using a first distillation column to perform distillation of a fraction obtained after separation of the extractant from the fraction (A) to obtain a fraction (C) in which isoprene is enriched and a fraction (D) in which piperylene is enriched;
• a dehydrogenation step of performing dehydrogenation or oxidative dehydrogenation of either or both of the linear hydrocarbon and the branched hydrocarbon contained in the fraction (B) to obtain a dehydrogenated product including either or both of a linear hydrocarbon dehydrogenated product containing piperylene and a branched hydrocarbon dehydrogenated product containing isoprene;
• and
• a recovery step of supplying the dehydrogenated product to an extractive distillation column or a distillation column and obtaining either or both of isoprene and piperylene from the dehydrogenated product.