A hydrocarbon production method for producing hydrocarbons, comprising:
- a) pretreating a hydrocarbon mixture, where the pre-treating comprises a step of dimerizing cyclopentadiene in the hydrocarbon mixture to obtain a hydrocarbon mixture containing dicyclopentadiene;
- and a step of using a predistillation column to perform distillation of the hydrocarbon mixture containing dicyclopentadiene to obtain
- a pretreated hydrocarbon mixture and a fraction (E) enriched in dicyclopentadiene, wherein the pretreated hydrocarbon mixture further contains isoprene, piperylene, a linear C5 hydrocarbon including one or fewer carbon-carbon double bonds, and a branched C5 hydrocarbon including one or fewer carbon-carbon double bonds;
- b) performing extractive distillation in a first extractive distillation column of the pretreated hydrocarbon mixture to produce a fraction (A) comprising an extractant enriched in isoprene and piperylene and a fraction (B) enriched in the linear hydrocarbon and the branched hydrocarbon having lower solubility than isoprene and piperylene in the extractant;
- c) performing distillation of a fraction obtained after separation of the extractant from the fraction (A) to obtain a fraction (C) enriched in isoprene and a fraction (D) enriched in piperylene;
- d) separating the linear and branched hydrocarbon contained in fraction (B);
- e) a dehydrogenation step of performing dehydrogenation or oxidative dehydrogenation of at least one of the separated linear hydrocarbon and the separated branched hydrocarbon contained in the fraction (B) to obtain a dehydrogenated product including at least one of a linear hydrocarbon dehydrogenated product containing piperylene and a branched hydrocarbon dehydrogenated product containing isoprene;
- f) determining a required production amount of isoprene and piperylene, wherein an amount of at least one of the linear and branched hydrocarbon is adjusted so that the isoprene and/or piperylene produced supplements a difference between the required amount of isoprene and piperylene and the amount of isoprene and piperylene produced from the extractive distillation;
- g) a recovery step of supplying the dehydrogenated product to an extractive distillation column or a distillation column and obtaining at least one of isoprene and piperylene from the dehydrogenated product,
- h) purifying the fraction (C) in an isoprene purification section including a second extractive distillation column to obtain high-purity isoprene;
- i) purifying the fraction (D) in a piperylene purification section to obtain high-purity piperylene;
- j) a dicyclopentadiene purification step of purifying the fraction (E) in a dicyclopentadiene purification section to obtain high-purity dicyclopentadiene;
- and
- k) a hydrogenation step of hydrogenating at least one of a residue discharged in the isoprene purification step, a residue discharged in the piperylene purification step, and a residue discharged in the dicyclopentadiene purification step,
- wherein at least one of the linear hydrocarbon and the branched hydrocarbon that is not dehydrogenated or oxidatively dehydrogenated in the dehydrogenation step is mixed with a hydrogenated product obtained in the hydrogenation step and used as a gasoline base material or a feedstock for an ethylene cracker.