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US 11,549,063 B2Granted
Thermal decomposition in chemical looping combustion
AssigneeNOVA Chemicals (International) S.A.
InventorsVasily Simanzhenkov, Rabi Dey, Hany Farag
Life of this patent
Estimating the term…
Abstract
A method is presented of thermal decomposition to crack ethane and/or higher alkane hydrocarbon feed or the mixture of any of these hydrocarbons to break down into component elements or simpler constituents using heat from a hot metal agent from a chemical looping combustion process.
Claims20
A process, comprising:
- passing a moving bed of reduced inorganic particulates having a melting temperature greater than 1500° C. and a particle size from 10 to 300 microns through an oxidation reactor at a temperature from 300° C. to 1200° C. for a period of time less than 2 minutes at a gas hourly space velocity for an oxidant from 500 hr−1 to 6000 hr−1, and a weight hourly space velocity from 0.5 hr−1 to 60 hr−1, wherein not less than 20 wt % of said reduced inorganic particulates passing through said oxidation reactor are oxidized to produce oxidized inorganic particulates;
- passing said oxidized inorganic particulates to and through a moving bed in a fuel reactor together with a fuel in the absence of a gaseous oxidant for a period of time of less than 2 minutes at a gas hourly space velocity for the fuel from 500 hr−1 to 6000 hr−1, and a weight hourly space velocity from 0.5 hr−1 to 60 hr−1, to burn the fuel and any surface carbon on the oxidized inorganic particulates and reduce the oxidized inorganic particulates and heat them to a temperature from 1000° C. to 1200° C. to produce heated reduced inorganic particulates;
- passing said heated reduced inorganic particulates as a moving bed through at least a portion of a dehydrogenation reactor while flowing one or more alkanes through the dehydrogenation reactor at a temperature from 750° C. to 1200° C. for a period of time less than 2 minutes at a gas hourly space velocity for the one or more alkanes from 500 hr−1 to 6000 hr−1, and a weight hourly space velocity from 0.5 hr−1 to 60 hr−1, to produce a product stream comprising:
- H2, one or more olefins, steam, and mixtures of alkynes, aromatics, di-olefins, heavy hydrocarbons and coke;
- and
- passing the reduced inorganic particulates from said dehydrogenation reactor to said oxidation reactor,
- wherein:
- after producing the oxidized inorganic particulates and before passing the oxidized inorganic particulates through the fuel reactor, the oxidized inorganic particulates do not pass through the dehydrogenation reactor;
- and
- after producing the heated reduced inorganic particulates and before passing the reduced inorganic particulates from said dehydrogenation reactor to said oxidation reactor, the heated reduced inorganic particulates are not oxidized.
7 more elements
A process, comprising:
- passing a moving bed of reduced inorganic particulates having a melting temperature greater than 1500° C. through an oxidation reactor at a temperature from 300° C. to 1200° C., wherein not less than 20 wt % of the reduced inorganic particulates passing through the oxidation reactor are oxidized to produce oxidized inorganic particulates;
- passing the oxidized inorganic particulates to and through a moving bed in a fuel reactor together with natural gas in the absence of a gaseous oxidant to burn the natural gas and any surface carbon on the oxidized inorganic particulates and reduce the oxidized inorganic particulates and heat them to a temperature from 1000° C. to 1200° C. to produce heated reduced inorganic particulates;
- passing the heated reduced inorganic particulates as a moving bed through at least a portion of a dehydrogenation reactor while flowing one or more alkanes through the dehydrogenation reactor at a temperature from 750° C. to 1200° C. to produce a product stream comprising H2 and one or more olefins;
- and
- passing the reduced inorganic particulates from the dehydrogenation reactor to the oxidation reactor.
2 more elements
A process, comprising:
- passing a moving bed of reduced inorganic particulates having a melting temperature greater than 1500° C. through an oxidation reactor at a temperature from 300° C. to 1200° C., wherein not less than 20 wt % of the reduced inorganic particulates passing through the oxidation reactor are oxidized to produce oxidized inorganic particulates;
- passing the oxidized inorganic particulates to and through a moving bed in a fuel reactor together with a fuel in the absence of a gaseous oxidant to burn the fuel and any surface carbon on the oxidized inorganic particulates and reduce the oxidized inorganic particulates and heat them to a temperature from 1000° C. to 1200° C. to produce heated reduced inorganic particulates;
- passing the heated reduced inorganic particulates as a moving bed through at least a portion of a dehydrogenation reactor while flowing one or more alkanes through the dehydrogenation reactor at a temperature from 750° C. to 1200° C. to produce a product stream comprising H2 and one or more olefins;
- passing the reduced inorganic particulates from the dehydrogenation reactor to the oxidation reactor,
- wherein the process further comprises extracting heat from exhaust from the fuel reactor and providing heat to the one or more alkanes prior to the one or more alkanes entering the dehydrogenation reactor.
2 more elements
Dependencies are inferred from the claim text.