Process and apparatus for the production of hydrogen and carbon dioxide. [scrubbing process]
Patent
·
OSTI ID:5128864
For the separation of substantially pure carbon dioxide and a gas enriched in hydrogen, said gases being especially suitable for the production of urea via an intermediate ammonia synthetic and reaction with CO/sub 4/ a system is provided of (a) scrubbing a raw gas consisting essentially of carbon dioxide, hydrogen and hydrogen sulfide in a first scrubbing stage with a first fraction of partially loaded physical scrubbing agent, e.g., methanol, to obtain a partially scrubbed raw gas depleted in H/sub 2/S and a more loaded scrubbing agent; (b) scrubbing said partially scrubbed raw gas in a second stage with physical scrubbing agent to obtain a further scrubbed raw gas enriched in hydrogen and said partially loaded physical scrubbing agent; (c) subjecting said more loaded scrubbing agent to at least one (preferably two) pressure reducing stages to obtain a gaseous phase therefrom; (d) subjecting a second fraction of said partially loaded scrubbing agent to at least one pressure-reducing stage to obtain reduced pressure liquid phase substantially free of hydrogen sulfide; and (e) scrubbing said gaseous phase of step (c) with at least a fraction of liquid phase of step (d) to obtain a scrubbed substantially pure carbon dioxide and hydrogen sulfide.
- Assignee:
- Linde AG
- Patent Number(s):
- US 4050909
- OSTI ID:
- 5128864
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
08 HYDROGEN
080100* -- Hydrogen-- Production
090320 -- Inorganic Hydrogen Compound Fuels-- Preparation-- (1976-1989)
10 SYNTHETIC FUELS
AMIDES
AMMONIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS GAS
UREA
080100* -- Hydrogen-- Production
090320 -- Inorganic Hydrogen Compound Fuels-- Preparation-- (1976-1989)
10 SYNTHETIC FUELS
AMIDES
AMMONIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS GAS
UREA