Alkali-based removal of chemical moieties from gas streams with chemical co-generation
Assignee8 Rivers Capital, LLC
InventorsXijia Lu, Brock Alan Forrest, Miles R. Palmer
Life of this patent
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Abstract
The present disclosure provides systems and methods useful in capture of one more moieties (e.g., carbon dioxide) from a gas stream (i.e., direct air capture). In various embodiments, the systems and methods can utilize at least a scrubbing unit, a regeneration unit, and an electrolysis unit whereby an alkali solution can be used to strip the moiety (e.g., carbon dioxide) from the gas stream, the removed moiety can be regenerated and optionally purified for capture or other use, and a formed salt can be subjected to electrolysis to recycle the alkali solution back to the scrubber for re-use with simultaneous production of one or more further chemicals.
Claims24
A system for capture of carbon dioxide with co-generation or one or more chemicals, the system comprising:
- a compression unit configured to provide a compressed carbon dioxide containing gas discharge stream;
- a scrubbing unit configured for contacting the compressed carbon dioxide containing gas discharge stream with an alkali solution to form a carbonate solution and output a carbon dioxide lean gas stream;
- a regeneration unit configured for reacting the carbonate solution with a halogenated compound to form one or more metal salts and output a stream comprising carbon dioxide;
- a carbon dioxide purification unit configured to receive the stream comprising carbon dioxide output from the regeneration unit;
- and
- an electrolysis unit configured to react the one or more metal salts with water to regenerate the alkali solution and form one or more further chemicals.
A method for capture of carbon dioxide with co-generation or one or more chemicals, the method comprising:
- contacting a gaseous carbon dioxide containing stream in a scrubbing unit with an alkali solution to form a carbonate solution and output a carbon dioxide lean gas stream;
- reacting the carbonate solution with a halogenated compound to form one or more metal salts and output a stream comprising carbon dioxide;
- processing the stream comprising carbon dioxide in a carbon dioxide purification unit configured to output a stream of substantially pure carbon dioxide;
- and
- reacting the one or more metal salts with water under electrolysis conditions to regenerate the alkali solution and form one or more further chemicals.
A system for capture of carbon dioxide with co-generation or one or more chemicals, the system comprising:
- a compression unit configured to provide a compressed carbon dioxide containing gas discharge stream;
- a scrubbing unit configured for contacting the compressed carbon dioxide containing gas discharge stream with an alkali solution to form a carbonate solution and output a carbon dioxide lean gas stream;
- a regeneration unit configured for reacting the carbonate solution with a halogenated compound to form one or more metal salts and output a stream comprising carbon dioxide;
- a carbon dioxide purification unit configured to receive the stream comprising carbon dioxide output from the regeneration unit;
- and
- an electrolysis unit configured to react the one or more metal salts with water to regenerate the alkali solution and form one or more further chemicals;
- wherein one or both of the following conditions applies:
- the compression unit is an air capture plant;
- the system further comprises one or more expanders configured to expand a pressurized stream and generate energy.
A method for capture of carbon dioxide with co-generation or one or more chemicals, the method comprising:
- contacting a gaseous carbon dioxide containing stream in a scrubbing unit with an alkali solution to form a carbonate solution and output a carbon dioxide lean gas stream;
- reacting the carbonate solution with a halogenated compound to form one or more metal salts and output a stream comprising carbon dioxide;
- reacting the one or more metal salts with water under electrolysis conditions to regenerate the alkali solution and form one or more further chemicals;
- and
- expanding one or more pressurized streams to generate energy.
Dependencies are inferred from the claim text.