Granted Patent B2

US 12,351,527 · App. 18/047,633 · Granted Jul 8, 2025

Inventors: Gaurav Sant (Los Angeles, CA); Dante Simonetti (Los Angeles, CA); Iman Mehdipour (Los Angeles, CA); David Jassby (Los Angeles, CA); Yenwen Tseng (Los Angeles, CA)

Assignees: The Regents of the University of California; CarbonBuilt

C04B40/0231C04B40/0007B01D53/1475C04B2111/00017

Abstract

Claims (26)

1. A method of forming a concrete product, the method comprising:

capturing CO 2 from a gas source, the capturing comprising:

contacting the gas source with an absorption solution having a solvent and a solute, wherein the solvent and/or the solute are capable of reacting with CO 2 to form an anionic compound;

adjusting the pH of the absorption solution electrochemically to less than about 7 to release the CO 2 as a concentrated vapor containing CO 2 ;

collecting the concentrated vapor containing CO 2 ;

regenerating the solvent and/or the solute; and

flowing the concentrated vapor containing CO 2 through a gas processing unit to adjust at least one of a temperature, a relative humidity, or a flow rate of the concentrated vapor containing CO 2 ; and

contacting the concentrated vapor containing CO 2 with a concrete component.

2. The method of claim 1 , wherein the concentrated vapor comprises about 2-99% (v/v) CO 2 .

3. The method of claim 1 , wherein the concentrated vapor comprises greater than or equal to 2% (v/v) CO 2 .

4. The method of claim 1 , wherein the concentrated vapor comprises less than or equal to 5% (v/v) CO 2 .

5. The method of claim 1 , wherein the concentrated vapor comprises 2.0% to 5.0% (v/v) CO 2 .

6. The method of claim 1 , wherein the concentrated vapor comprises 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, or 5.0% (v/v) CO 2 .

7. The method of claim 1 , wherein the concentrated vapor containing CO 2 has a relative humidity that ranges from 5% to 90%.

8. The method of claim 1 , wherein the concentrated vapor containing CO 2 has a temperature that ranges from 20° C. to 80° C.

9. The method of claim 1 , wherein collecting the concentrated vapor containing CO 2 comprises fractionally enriching the concentration of CO 2 in the concentrated vapor containing CO 2 .

10. The method of claim 1 , wherein the absorption solution comprises one or more amines.

11. The method of claim 1 , wherein contacting the concentrated vapor containing CO 2 with the concrete component further comprises:

providing a carbonatable concrete mixture comprising the concrete component;

hydrating the carbonatable concrete mixture, reacting the carbonatable concrete mixture, or both hydrating and reacting the carbonatable concrete mixture to form the concrete component; and

contacting the concrete component with the concentrated vapor containing CO 2 to harden the concrete mixture via the formation of carbonate minerals to form a concrete product.

12. The method of claim 1 , wherein the gas source is an effluent from an industrial source, an atmospheric source, a commercially-available CO 2 source, or liquefied CO 2 .

13. The method of claim 1 , wherein adjusting the pH of the absorption solution occurs at ambient temperature.

14. The method of claim 1 , wherein the concentrated vapor containing CO 2 is not stored.

15. The method of claim 1 , wherein adjusting the pH of the absorption solution electrochemically to less than about 7 to release the CO 2 as a concentrated vapor containing CO 2 comprises using a pH swing induced by water electrolysis in a cell that incorporates at least one ion exchange membrane.

16. The method of claim 1 , further comprising collecting the regenerated solvent and/or solute.

Assignments (3)

Continuity (2)

References Cited (296)