Methods and systems for converting carbon oxides to olefins
AssigneeLummus Technology Inc.
InventorsGARY G. PODREBARAC, EDWARD KATENDE, ZAN LIU
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Abstract
A method of converting carbon oxides to olefins is provided. The method can include directing a renewable hydrogen feed stream and a carbon oxide feed stream to a methanation reactor to generate an oxidative coupling of methane (OCM) feed stream that includes methane. The OCM feed stream and an oxidant feed stream including oxygen are directed to an OCM reactor containing an OCM catalyst to produce an OCM effluent that includes ethylene. A system for converting carbon oxides to olefins is also provided. The methods and systems produce olefins including ethylene with negative carbon emissions.
Claims20
A method of converting carbon oxides to olefins including ethylene (C2H4), the method comprising:
- (a) directing a renewable hydrogen (Hz) feed stream and a carbon oxide feed stream comprising carbon dioxide (CO2), carbon monoxide (CO), or both CO2 and CO to a methanation reactor to generate an oxidative coupling of methane (OCM) feed stream comprising methane (CH4);
- and
- (b) directing the OCM feed stream and an oxidant feed stream comprising oxygen (O2) to an OCM reactor comprising an OCM catalyst and performing an OCM reaction to generate an OCM effluent comprising (i) C2+ compounds including C2H4 and ethane (C2H6) and (ii) non-C2+ impurities comprising one or more of CO, CO2, H2, and CH4,
- wherein the method produces olefins including C2H4 with negative carbon emissions.
A method of converting carbon dioxide to olefins including ethylene (C2H4), the method comprising:
- (a) directing a natural gas stream containing carbon dioxide (CO2) to a gas treatment unit to generate a CO2 feed stream and a substantially CO2-free natural gas stream;
- (b) directing a renewable hydrogen (Hz) feed stream and the CO2 feed stream to a methanation reactor to generate an oxidative coupling of methane (OCM) feed stream comprising methane (CH4);
- and
- (c) directing the OCM feed stream and an oxidant feed stream comprising oxygen (O2) to an OCM reactor comprising an OCM catalyst and performing an OCM reaction to generate an OCM effluent comprising (i) C2+ compounds including C2H4 and ethane (C2H6) and (ii) non-C2+ impurities comprising one or more of CO, CO2, H2, and CH4,
- wherein the method produces olefins including C2H4 with negative carbon emissions.
A system for converting carbon oxides to olefins including ethylene (C2H4), the system comprising:
- (a) a renewable hydrogen (H2) subsystem configured to generate a renewable H2 feed stream;
- (b) a methanation subsystem fluidly coupled to the renewable H2 subsystem, wherein the methanation subsystem is configured to receive the renewable H2 feed stream and a carbon oxide feed stream comprising carbon dioxide (CO2), carbon monoxide (CO), or both CO2 and CO and to generate an oxidative coupling of methane (OCM) feed stream comprising methane (CH4);
- (c) an OCM subsystem downstream of and fluidly coupled to the methanation subsystem, wherein the OCM subsystem is configured to receive the OCM feed stream and an oxidant feed stream comprising oxygen (O2) to generate an OCM effluent comprising (i) C2+ compounds including C2H4 and ethane (C2H6) and (ii) non-C2+ impurities comprising one or more of CO, CO2, H2, and CH4;
- and
- (d) a separations subsystem downstream of and fluidly coupled to the OCM subsystem, wherein the separations subsystem is configured to receive the OCM effluent and separate the OCM effluent into at least (i) a first stream comprising COx, H2, and CH4 and (ii) a second stream comprising C2+ compounds including C2H4 and C2H6,
- wherein the system is configured to operate such that olefins including C2H4 are produced with negative carbon emissions.
Dependencies are inferred from the claim text.