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US-20260125602-A1 - USEFUL HYDROCARBON PRODUCTION METHOD AND USEFUL HYDROCARBON PRODUCTION APPARATUS

US20260125602A1US 20260125602 A1US20260125602 A1US 20260125602A1US-20260125602-A1

Abstract

Provided is a useful hydrocarbon production method including: a methanation step for generating a first gas containing methane from a mixed gas containing hydrogen and carbon dioxide; a dry reforming step for generating a second gas containing carbon monoxide and hydrogen from the first gas; a useful hydrocarbon generating step for generating a third gas containing a useful hydrocarbon from the carbon monoxide and hydrogen in the second gas; and a recycling step of separating a dry reforming recycle gas containing at least carbon dioxide from the third gas, and supplying the dry reforming recycle gas to the dry reforming step.

Inventors

  • Yuki KAWAMATA
  • Yuki IWANO
  • Hiroko Takahashi
  • Yuichiro BAMBA
  • Junya Hirano
  • Takashi Fujikawa
  • Yu Lee
  • Nobumitsu Yamanaka

Assignees

  • FURUKAWA ELECTRIC CO., LTD.

Dates

Publication Date
20260507
Application Date
20231005
Priority Date
20221005

Claims (20)

  1. 1 . A useful hydrocarbon production method comprising: a methanation step of generating a first gas containing methane from a mixed gas containing hydrogen and carbon dioxide; a dry reforming step of generating a second gas containing carbon monoxide and hydrogen from the first gas; a useful hydrocarbon generating step of generating a third gas containing a useful hydrocarbon from the carbon monoxide and hydrogen in the second gas; and a recycling step of separating a dry reforming recycle gas containing at least carbon dioxide from the third gas, and supplying the dry reforming recycle gas to the dry reforming step.
  2. 2 . The useful hydrocarbon production method according to claim 1 , wherein the recycling step adjusts a supplied amount of the dry reforming recycle gas to be supplied to the dry reforming step, according to a ratio (M HC /M CO2 ) of a total carbon mole number M HC of hydrocarbons supplied to the dry reforming step relative to a total carbon mole number M CO2 of carbon dioxide in the first gas and carbon dioxide in the dry reforming recycle gas supplied to the dry reforming step.
  3. 3 . The useful hydrocarbon production method according to claim 1 , wherein a CO 2 concentration of the dry reforming recycle gas is 40% or more.
  4. 4 . The useful hydrocarbon production method according to claim 1 , further comprising a hydrogen supplying step of supplying hydrogen to the useful hydrocarbon generating step.
  5. 5 . The useful hydrocarbon production method according to claim 1 , further comprising a hydrogen recycling step of separating hydrogen from the third gas and supplying the hydrogen to the useful hydrocarbon generating step.
  6. 6 . The useful hydrocarbon production method according to claim 5 , wherein the hydrogen recycling step adjusts a supplied amount of hydrogen to be supplied to the useful hydrocarbon generating step according to a mole number M H of hydrogen in the useful hydrocarbon generating step.
  7. 7 . The useful hydrocarbon production method according to claim 1 , further comprising a moisture removing step of removing moisture contained in the first gas discharged from the methanation step.
  8. 8 . The useful hydrocarbon production method according to claim 1 , further comprising an adjusting step of adjusting a mole ratio (M H /M CO ) of a mole number M H of hydrogen relative to a mole number M CO of carbon monoxide in the second gas obtained in the dry reforming step.
  9. 9 . The useful hydrocarbon production method according to claim 1 , further comprising a combusting step of separating a substance containing carbon atoms from the third gas and combusting the substance containing carbon atoms to generate carbon dioxide, wherein the recycling step supplies the dry reforming recycle gas and carbon dioxide generated in the combusting step to the dry reforming step.
  10. 10 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is at least one type of hydrocarbon selected from the group consisting of olefins, aromatic hydrocarbons, gasoline, liquefied petroleum gas and liquid hydrocarbons.
  11. 11 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is liquefied petroleum gas.
  12. 12 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is liquefied petroleum gas, and hydrocarbons other than C3 to C4 hydrocarbons are included in the dry reforming recycle gas.
  13. 13 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is an olefin, and hydrocarbons other than a target olefin are included in the dry reforming recycle gas.
  14. 14 . The useful hydrocarbon production method according to claim 13 , wherein carbon monoxide is further included in the dry reforming recycle gas.
  15. 15 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is an aromatic hydrocarbon, and hydrocarbons other than a target aromatic hydrocarbon are included in the dry reforming recycle gas.
  16. 16 . The useful hydrocarbon production method according to claim 15 , wherein carbon monoxide is further included in the dry reforming recycle gas.
  17. 17 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is gasoline, and hydrocarbons other than gasoline are included in the dry reforming recycle gas.
  18. 18 . The useful hydrocarbon production method according to claim 17 , wherein carbon monoxide is further included in the dry reforming recycle gas.
  19. 19 . The useful hydrocarbon production method according to claim 1 , wherein the useful hydrocarbon is a liquid hydrocarbon, and C4 or lower hydrocarbons are included in the dry reforming recycle gas.
  20. 20 . The useful hydrocarbon production method according to claim 19 , wherein carbon monoxide is further included in the dry reforming recycle gas.

Description

TECHNICAL FIELD The present disclosure relates to a useful hydrocarbon production method and a useful hydrocarbon production device. BACKGROUND ART Useful hydrocarbons such as various lower olefins and aromatic hydrocarbons which are basic chemical raw materials, various liquid fuels (gasoline or liquefied petroleum gas (LPG), aviation fuel, etc.) are hydrocarbons having a carbon number of 2 or higher, and are mainly produced from petroleum resources. However, due to the petroleum resources mainly being the raw materials in the production process of these hydrocarbons, there is concern over geopolitical risks. Furthermore, in a production process or consumption process of these hydrocarbons, due to discharging an abundance of carbon dioxide, it is considered to be a problem also from the viewpoint of global warming. Therefore, the development of a clean process establishing resources for which the regions of the reserves are not limited as raw materials, and having lower carbon dioxide emissions has been sought. As an example, compared to crude oil and gasoline, liquefied petroleum gas has few emissions of carbon dioxide, which is one cause of global warming, and thus research into suppressing global warming is actively being conducted. For example, Patent Document 1 discloses a production method of liquefied petroleum gas including: a synthesis gas production step of producing synthesis gas with a predetermined composition from a carbon-containing raw material, at least one selected from water, oxygen and carbon dioxide, and a low boiling component; a lower paraffin production step of producing a lower paraffin-containing gas containing a low-boiling component from the synthesis gas; a separation step of separating the low boiling component from the lower paraffin-containing gas; and a recycling step of recycling the low-boiling component to the synthesis gas production step. However, Patent Document 1 has an object of producing a liquefied petroleum gas having high concentrations of propane and butane from a carbon-containing raw material such as natural gas. For this reason, there has been room for improvement in respect to the global warming prevention. CITATION LIST Patent Document Patent Document 1: Japanese Unexamined Patent Application, Publication No. 2006-143752 DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present disclosure is to provide a useful hydrocarbon production method and a useful hydrocarbon production device which can stably produce over a long period of time using carbon dioxide as the main raw material, while achieving a reduction in carbon dioxide and a suppression of emission of carbon dioxide. Means for Solving the Problems [1] A useful hydrocarbon production method includes: a methanation step of generating a first gas containing methane from a mixed gas containing hydrogen and carbon dioxide; a dry reforming step of generating a second gas containing carbon monoxide and hydrogen from the first gas; a useful hydrocarbon generating step of generating a third gas containing a useful hydrocarbon from the carbon monoxide and hydrogen in the second gas; and a recycling step of separating a dry reforming recycle gas containing at least carbon dioxide from the third gas, and supplying the dry reforming recycle gas to the dry reforming step. [2] In the useful hydrocarbon production method as described in the above [1], the recycling step adjusts a supplied amount of the dry reforming recycle gas to be supplied to the dry reforming step, according to a ratio (MHC/MCO2) of a total carbon mole number MHC of hydrocarbons supplied to the dry reforming step relative to a total carbon mole number MCO2 of carbon dioxide in the first gas and carbon dioxide in the dry reforming recycle gas supplied to the dry reforming step. [3] In the useful hydrocarbon production method as described in the above [1] or [2], a CO2 concentration of the dry reforming recycle gas is 40% or more. [4] The useful hydrocarbon production method as described in any one of the above [1] to [3] further includes a hydrogen supplying step of supplying hydrogen to the useful hydrocarbon generating step. [5] The useful hydrocarbon production method as described in any one of the above [1] to [4] further includes a hydrogen recycling step of separating hydrogen from the third gas and supplying the hydrogen to the useful hydrocarbon generating step. [6] In the useful hydrocarbon production method as described in the above [5], the hydrogen recycling step adjusts a supplied amount of hydrogen to be supplied to the useful hydrocarbon generating step according to a mole number MH of hydrogen in the useful hydrocarbon generating step. [7] The useful hydrocarbon production method as described in any one of the above [1] to [6] further includes a moisture removing step of removing moisture contained in the first gas discharged from the methanation step. [8] The useful hydrocarbon production method