Catalytic coal hydrogasification process
In Exxon Research and Engineering Co.'s new approach, methane is produced by a thermoneutral process in which finely divided coal or other carbonaceous material is reacted with steam and hydrogen in the presence of an alkali-metal catalyst (1 to 50 wt percent based on carbonaceous material) in a fluidized bed at a temperature of 1200/sup 0/ to 1500/sup 0/F. The hydrogen and reactant steam concentrations are controlled so that the exothermic hydrogasification reactions provide sufficient heat for the endothermic steam reactions, reactant preheat, and reactor heat losses. The overhead gas from the gasifier is steam-reformed in the presence of an alkali-metal catalyst at a temperature of 1300/sup 0/ to 1700/sup 0/F. Acid constituents such as CO/sub 2/ and H/sub 2/S are removed from the reformed gas, which is then cryogenically separated into hydrogen, CO, and methane. The hydrogen is recycled to the hydrogasification zone and the CO used to fire the steam-reformer furnace. The high-purity methane from the cryogenic unit can be employed as a pipeline gas without further treatment.
- Assignee:
- Exxon Research and Engineering Co.
- Patent Number(s):
- US 3847567
- OSTI ID:
- 7327557
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exxon catalytic coal gasification process: predevelopment program. Annual report, July 1976--June 1977
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
FLUIDIZED BED
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS