Process for the production of a chemical synthesis gas from coal
A process is described for the production of a chemical synthesis product gas from a carbonaceous feed material and steam which comprises: (A) reacting said steam with said carbonaceous feed material in a reaction zone at a reaction temperature between about 1000F and about 1500/sup 0/F and at a reaction pressure in excess of about 100 psia, in the presence of a carbon-alkali metal catalyst and sufficient added hydrogen and carbon monoxide to provide substantially equilibrium quantities of hydrogen and carbon monoxide in said reaction zone at said reaction temeperature and said reaction pressure; (B) withdrawing from said reaction zone an effluent gas containing substantially equilibrium quantities, at said reaction temperature and pressure, of methane, carbon dioxide, steam, hydrogen and carbon monoxide; (C) treating said effluent gas for the removal of steam and acid gases to produce a treated gas containing primarily carbon monoxide, hydrogen and methane; (D) recovering substantially all of the carbon monoxide and hydrogen from said treated gas as a chemical synthesis product gas, thereby producing a gas comprised substantially of methane; (E) contacting the gas produced in step (D) comprised substantially of methane with steam in a steam reforming zone under conditions such tat at least a portion of the methane present reacts with said steam to produce hydrogen and carbon monoxide; and (F) passing the effluent from said steam reforming zone into said reaction zone without substantial cooling, thereby supplying said added hydrogen and carbon monoxide required in said reaction zone and wherein said reforming zone is operated at conditions such that the heat content of said effluent from said steam reforming zone is sufficient to supply substantially all of the heat needed to preheat said carbonaceous feed material to said reaction temperature.
- Assignee:
- Exxon Research and Engineering Co
- Patent Number(s):
- US 4211669
- OSTI ID:
- 5113418
- Resource Relation:
- Patent File Date: Filed date 9 Nov 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
08 HYDROGEN
ALKALI METALS
CATALYTIC EFFECTS
CARBON
SYNTHESIS GAS
PRODUCTION
PURIFICATION
STEAM REFORMER PROCESSES
CARBON MONOXIDE
COAL
COAL GAS
COAL GASIFICATION
HYDROGEN
HYDROGEN PRODUCTION
METHANE
RECYCLING
STEAM
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
GASIFICATION
HYDROCARBONS
MATERIALS
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFORMER PROCESSES
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
080103 - Hydrogen- Production- Steam Reformer Processes
080107 - Hydrogen- Production- Coal Gasification