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1. (WO2018160888) DIRECT AIR CAPTURE (DAC) CARBON DIOXIDE (CO2) SEQUESTRATION METHODS AND SYSTEMS
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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WHAT IS CLAIMED IS:

1. A method of sequestering C02 from a gaseous source of C02, the method comprising:

a) contacting an aqueous capture liquid with a direct air capture (DAC) generated gaseous source of C02 under conditions sufficient to produce an aqueous carbonate; and

b) combining a cation source and the aqueous carbonate under conditions sufficient to produce a C02 sequestering carbonate;

to sequester C02 from the gaseous source of C02.

2. The method according to Claim 1 , wherein the aqueous capture liquid comprises an aqueous capture ammonia.

3. The method according to Claim 2, wherein combining the cation source and the aqueous ammonium carbonate produces a C02 sequestering carbonate and an aqueous ammonium salt.

4. The method according to Claim 3, wherein the method further comprises regenerating aqueous capture ammonia from the aqueous ammonium salt.

5. The method according to Claim 4, wherein regenerating the aqueous capture ammonia from the aqueous ammonium salt comprises distillation.

6. The method according to Claim 5, wherein the distillation comprises heating the aqueous ammonium salt in the presence of an alkalinity source.

7. The method according to Claim 6, wherein the alkalinity source is produced by dissolving a geomass.

8. The method according to Claim 7, wherein the geomass comprises demolished, recycled or returned concrete.

9. The method according to Claims 7 or 8, wherein the dissolving of geomass comprises employing microwave energy.

10. The method according to any of the preceding claims, wherein the cation source comprises an alkaline earth metal cation.

11. The method according to Claim 10, wherein the cation source is a source of divalent cations.

12. The method according to Claim 1 1 , wherein the divalent cations comprise alkaline earth metal cations.

13. The method according to Claim 12, wherein the divalent alkaline earth metal cations are selected from the group consisting of Ca2+ and Mg2+, and combinations thereof.

14. A system for sequestering C02 from a gaseous source of C02, the system comprising:

a direct air capture (DAC) component; and

a carbonate production component operatively coupled to the DAC component.

15. The system according to Claim 14, wherein the carbonate production component comprises:

a C02 gas/ aqueous capture ammonia module;

a carbonate production module; and

an aqueous capture ammonia regeneration module.