Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
  • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
  • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
  • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
  • C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
  • C01B3/382—Multi-step processes
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B32/00—Carbon; Compounds thereof
  • C01B32/40—Carbon monoxide

Definitions

• the invention relates to a process for the production of carbon monoxide, in which a mixture of hydrocarbon, preferably methane, and carbon dioxide is fed in the presence of a catalyst with the supply of heat to at least one reforming stage and carbon dioxide and hydrogen are separated from the reformed starting gas mixture.
• the reforming stage consists of a radiation reformer to which combustion air and fuel are fed for heating.
• the carbon dioxide content from the exhaust gases from the reformer heating is recovered for the reforming process, as is the residual carbon dioxide content remaining in the product gas.
• the nitrogen content from the exhaust gases is removed as a by-product.
• Heat is removed from the reforming process at various points by coolers.
• This object is achieved in that the gas mixture is fed to a convectively heated first reforming stage, the starting gas of the first reforming stage is fed together with oxygen to an autothermal second reforming stage, and the starting gas of the second reforming stage is fed to the convectively heated reforming stage as heating gas.
• the heat generated in the autothermal reforming stage is used for the process itself, since it is used to heat the first reforming stage via the heating gas.
• Convectionally heated reforming stages are known per se. They preferably have a large number of canned tubes with an outer tube flushed with a heating gas and an inner tube serving for gas recirculation, the space between the outer tube and inner tube being filled with a catalyst (cf., for example, the applicant's prospectus: "Plant and Apparatus construction - components and circuits! "(1986) page 31).
• Autothermal reformers which are often used as secondary reformers, are also known per se.
• NH3 synthesis z. B first subjected to a steam refor ier process the feed gas in a primary reformer.
• the starting gas from the primary reformer with a relatively high residual methane content is then mixed with air in an autothermal reformer serving as a secondary reformer via a mixing device (burner) and then passed over a bed of catalyst.
• the secondary reform stage serves to introduce nitrogen into the synthesis gas (see DE-Z. "Chemiker-Zeitung” (1972) page 141, right column).
• the second reforming stage is additionally supplied with carbon dioxide.
• the heat content of the gases emerging from the convectively heated reforming stage is still sufficiently large, it is expedient to preheat at least one of the feed gases and / or at least one of the return gases by heat exchange with the starting gas of the second reforming stage, i.e. H. also to integrate the remaining waste heat in the process for the production of carbon monoxide un as in the known process management in external processes, for. B. for steam generation.
• a mixture of essentially methane (CH *) and carbon dioxide (CO2) is fed via line 1, in which a heat exchanger 2 is arranged, to a convectively heated reformer 3.
• the preheated gas mixture flows through a can filled with a catalyst.
• the starting gas of the reformer 3 with high proportions of carbon monoxide, carbon dioxide, water vapor and hydrogen, and a residual methane content is fed via line 4 to an autothermal reformer 5.
• the autothermal reformer 5 we Via a line 7 oxygen (O2) supplied.
• the output gas of the reformer 3 supplied via line 4 is further reformed here in an autothermal process in order to substantially reduce the residual methane content.
• the starting gas of the autothermal reformer 5 is fed via a line 8 as the heating gas to the convectively heated reformer 3, in which it flows around the can from the outside.
• the output gas of the reformer 3 is fed via a line 9, in which the heat exchanger 2 and a further heat exchanger 6 are arranged, to a water vapor separator 10, from which the separated water is drawn off via a line 11.
• the synthesis gas which now consists of a mixture of carbon monoxide, carbon dioxide and hydrogen and possibly a very small proportion of residual methane, is then fed via line 12 to a carbon dioxide scrubber 13.
• the washed-out carbon dioxide is returned to line 1 as a return gas via a line 14 and / or is fed to line 4 and thus to the autothermal reformer 5 via a line 15 led via the heat exchanger 6.
• the gas freed from carbon dioxide is fed via line 16 to a hydrogen separator 17; the gas freed from hydrogen is withdrawn as product gas via line 18.
• the separated hydrogen can be fed via lines 19 and 20 to the reformers 3 and 5 as recycle gas.
• the heat exchanger 21 shown in dashed lines in the figure is intended to show that preheating of the recycled hydrogen by the starting gas of the first reforming stage could also be considered if necessary.
• gas cleaning stages 10, 13 and 17 are used to set an im essential carbon monoxide-containing product gas with desired proportions of water vapor, carbon dioxide and hydrogen is possible; if necessary, methane can also be fed via a line 22 to the autothermal reformer 5, which is preheated together with the carbon dioxide in the heat exchanger 6.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Hydrogen, Water And Hydrids (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6400314

Family Applications (1)

Country Status (3)

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Family Cites Families (9)

• 1990
  • 1990-02-16 DE DE4004869A patent/DE4004869C1/de not_active Expired - Lifetime
• 1991
  • 1991-02-14 EP EP91903849A patent/EP0515446A1/de not_active Ceased
  • 1991-02-14 WO PCT/EP1991/000288 patent/WO1991012200A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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