Methods and systems for CO
A method for separating carbon dioxide (CO 2 ) from a gas stream is provided. The method includes reacting at least a portion of CO 2 in the gas stream with a plurality of liquid sorbent particles to form a plurality of solid adduct particles and a first CO 2 -lean gas stream; the solid adduct particles entrained in the first CO 2 -lean gas stream to form an entrained gas stream. The method includes separating at least a portion of the plurality of solid adduct particles from the entrained gas stream in a separation unit to form an adduct stream and a second CO 2 -lean gas stream. The method further includes heating at least a portion of the adduct stream in a desorption unit to form a CO 2 stream and a regenerated liquid sorbent stream. A system for separating CO 2 from a gas stream is also provided.
1. A method for separating carbon dioxide (CO 2 ) from a gas stream, comprising:
(i) contacting a first liquid sorbent stream comprising a plurality of liquid sorbent particles with the gas stream in a reaction chamber;
(ii) reacting at least a portion of CO 2 in the gas stream with the plurality of liquid sorbent particles to form a plurality of solid adduct particles and a first CO 2 -lean gas stream, wherein the plurality of solid adduct particles is entrained in the first CO 2 -lean gas stream to form an entrained gas stream;
(iii) transferring the entrained gas stream from the reaction chamber to a separation unit via an outlet located in a lower region of the reaction chamber relative to an inlet for the first liquid sorbent stream;
(iv) contacting the entrained gas stream with a second liquid sorbent stream in the separation unit, thereby separating at least a portion of the plurality of solid adduct particles from the entrained gas stream to form an adduct stream and a second CO 2 -lean gas stream; and
(v) heating at least a portion of the adduct stream in a desorption unit to form a CO 2 stream and a regenerated liquid sorbent stream.
2. The method of claim 1 , further comprising circulating a portion of the regenerated liquid sorbent stream to the separation unit, wherein the second liquid sorbent stream comprises at least a portion of the regenerated liquid sorbent stream.
3. The method of claim 1 , wherein step (iv) further comprises reacting at least a portion of unreacted CO 2 in the entrained gas stream with the liquid sorbent in the second liquid sorbent stream to form a plurality of solid adduct particles.
4. The method of claim 1 , wherein step (iv) further comprises forming a slurry, and the adduct stream comprises a slurry of the plurality of solid adduct particles and the liquid sorbent.
5. The method of claim 1 , wherein the separation unit comprises a wet-scrubber.
6. The method of claim 5 , wherein the separation unit further comprises a mist eliminator, a cyclone, or combinations thereof.
7. The method of claim 1 , wherein the entrained gas stream further comprises a plurality of liquid sorbent particles, and step (iv) further comprises separating the liquid sorbent particles in the separation unit.
8. The method of claim 1 , further comprising contacting the adduct stream with a third liquid sorbent stream in a suspension unit to form a slurry, and pressurizing and transporting the slurry to the desorption unit.
9. The method of claim 8 , further comprising circulating a portion of the regenerated liquid sorbent stream to the suspension unit, wherein the third liquid sorbent stream comprises at least a portion of the regenerated liquid sorbent stream.
10. The method of claim 1 , further comprising circulating at least a portion of the regenerated liquid sorbent stream to the reaction chamber.
11. The method of claim 1 , wherein the liquid sorbent in the first liquid sorbent stream comprises an amino siloxane.
12. The method of claim 1 , wherein the plurality of solid adduct particles comprises a carbamate, a bicarbonate, or combinations thereof.
13. The method of claim 1 , wherein the first liquid sorbent stream and the second liquid sorbent stream are substantially free of a solvent selected from the group consisting of water, ionic liquids, and combinations thereof.
14. A method for separating carbon dioxide (CO 2 ) from a gas stream, comprising:
(i) contacting a first liquid sorbent stream comprising a plurality of liquid sorbent particles with the gas stream in a reaction chamber;
(ii) reacting at least a portion of CO 2 in the gas stream with the plurality of liquid sorbent particles to form a plurality of solid adduct particles, wherein the solid adduct particles are entrained in the gas stream to form an entrained gas stream;
(iii) transferring the entrained gas stream from the reaction chamber to a separation unit via an outlet located in a lower region of the reaction chamber relative to an inlet for the first liquid sorbent stream;
(iv) contacting the entrained gas stream with a second liquid sorbent stream in the separation unit, thereby separating at least a portion of the plurality of solid adduct particles from the entrained gas stream to form an adduct stream and a CO 2 -lean gas stream;
(v) contacting the adduct stream with a third liquid sorbent stream in a suspension unit to form a slurry, and transporting the slurry to a desorption unit;
(vi) heating at least a portion of the slurry to form a CO 2 stream and a regenerated liquid sorbent stream; and
(vii) circulating at least a portion of the regenerated liquid sorbent stream to the separation unit.