Removal of hydrogen sulfide as ammonium sulfate from hydropyrolysis product vapors
AssigneeGas Technology Institute
InventorsTerry L. Marker, Larry G. Felix, Martin B. Linck, Michael J. Roberts
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Abstract
A system and method for processing biomass into hydrocarbon fuels that includes processing a biomass in a hydropyrolysis reactor resulting in hydrocarbon fuels and a process vapor stream and cooling the process vapor stream to a condensation temperature resulting in an aqueous stream. The aqueous stream is sent to a catalytic reactor where it is oxidized to obtain a product stream containing ammonia and ammonium sulfate. A resulting cooled product vapor stream includes non-condensable process vapors comprising H2, CH4, CO, CO2, ammonia and hydrogen sulfide.
Claims19
A method for processing biomass into hydrocarbon fuels comprising:
- processing a biomass in a hydropyrolysis reactor resulting in hydrocarbon fuels, char, and a process vapor stream;
- cooling the process vapor stream to a condensation temperature resulting in an aqueous stream;
- sending the aqueous stream to a catalytic reactor;
- injecting air into the catalytic reactor to obtain an aqueous product stream containing ammonia and ammonium sulfate;
- and
- obtaining a cooled product vapor stream, containing non-condensable process vapors comprising H2, CH4, CO, CO2, ammonia and hydrogen sulfide.
A method for removal of sulfur from biomass conversion products comprising:
- processing the biomass in a hydropyrolysis reactor, resulting in char and a heated process vapor stream containing hydrogen, water vapor, condensable hydrocarbon vapors, non-condensable hydrocarbon vapors, carbon monoxide and carbon dioxide;
- cooling the process vapor stream to a condensation temperature to a cooled and condensed product stream;
- separating the cooled and condensed product stream into a gaseous and liquid component;
- obtaining a liquid hydrocarbon stream;
- obtaining an aqueous stream, containing water, ammonia, and ammonium sulfide;
- obtaining a cooled product vapor stream, containing non-condensable process vapors comprising H2, CH4, CO, CO2, ammonia and hydrogen sulfide;
- sending the aqueous stream to a catalytic reactor;
- injecting air into the catalytic reactor thereby oxidizing ammonium sulfide over a catalyst resulting in ammonium sulfate;
- obtaining an aqueous product stream containing water, ammonia and ammonium sulfate;
- evaporating excess water from the aqueous product stream containing ammonium sulfate resulting in steam and a concentrate of ammonium sulfate;
- cooling the concentrate of ammonium sulfate to precipitate out the ammonium sulfate as crystallized ammonium sulfate;
- and
- filtering out the crystallized ammonium sulfate.
Dependencies are inferred from the claim text.