Process for Sequestration of Carbon Dioxide

• US 20090010827A1
• Filed: 12/18/2006
• Published: 01/08/2009
• Est. Priority Date: 12/20/2005
• Status: Active Grant

• Current Assignee: Shell Oil Company (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Van Mossel, Gerardus Antonius, In' T Veen, Bernardus Cornelis Maria, Geerlings, Jacobus Johannes Cornelis
• Granted Patent: US 7,731,921 B2
• Time in Patent Office: Days
• US Class Current: 423/164
• CPC Class Codes: B01D 2251/404 of calcium
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: C01F 11/18 Carbonates
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

A process for sequestration of carbon dioxide comprising the following steps: (a) dispersing solid waste material comprising calcium oxide and a calcium-comprising mixed oxide in water to dissolve at least part of the calcium oxide and to form calcium oxide-depleted solid waste material in a calcium hydroxide solution; (b) separating the calcium hydroxide solution from the calcium oxide-depleted solid waste material; (c) converting the calcium hydroxide in the separated calcium hydroxide solution in precipitated calcium carbonate; and (d) contacting an aqueous slurry of the calcium oxide-depleted solid waste material with carbon dioxide for mineral carbonation of the carbon dioxide to form carbonated solid waste material.

Claims

1. A process for sequestration of carbon dioxide comprising the following steps:

(a) dispersing solid waste material comprising calcium oxide and a calcium-comprising mixed oxide in water to dissolve at least part of the calcium oxide and to form calcium oxide-depleted solid waste material in a calcium hydroxide solution;

(b) separating the calcium hydroxide solution from the calcium oxide-depleted solid waste material;

(c) converting the calcium hydroxide in the separated calcium hydroxide solution in precipitated calcium carbonate;

(d) contacting an aqueous slurry of the calcium oxide-depleted solid waste material with carbon dioxide for a time period sufficient to form an aqueous solution of calcium bicarbonate for mineral carbonation of the carbon dioxide to form carbonated solid waste material;

(e) separating part or all of the aqueous solution of calcium bicarbonate from the carbonated solid waste material;

(f) precipitating calcium carbonate from the separated aqueous solution of calcium bicarbonate; and

(g) recovering the precipitated calcium carbonate as product;

in which process the calcium carbonate is precipitated from the separated aqueous solution of calcium bicarbonate in step (f);

(i) by adding calcium hydroxide from the solution obtained in step (b) to the separated aqueous solution of calcium bicarbonate; and

/or

(ii) by removal of carbon dioxide from the solution of calcium bicarbonate and wherein the carbon dioxide removed in step (f) is added to the calcium hydroxide solution in step (c).

2. A process according to claim 1, wherein the calcium-comprising mixed oxide is calcium silicate, calcium iron oxide or calcium iron silicate.

3. A process according to claim 2, wherein the solid waste material is steel slag.

4. A process according to claim 1, wherein step (d) is carried out at a temperature in the range of from 0 to 200°

C.

5. A process according to claim 1, wherein the operating pressure during step (d) is in the range of from 1 to 150 bar (absolute).

6. A process according to claim 1, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial off-gas.

7. A process according to claim 1, wherein the calcium-comprising mixed oxide is calcium silicate.

8. A process according to claim 1, wherein step (d) is carried out at a temperature in the range of from 0 to 100°

C.

9. A process according to claim 1, wherein step (d) is carried out at a temperature in the range of from 10 to 60°

C.

10. A process according to claim 1, wherein the operating pressure during step (d) is in the range of from 1 to 40 bar (absolute).

11. A process according to claim 1, wherein the operating pressure during step (d) is in the range of from 1 to 10 bar (absolute).

12. A process according to claim 1, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial flue gas.

13. A process according to claim 2, wherein step (d) is carried out at a temperature in the range of from 0 to 200°

C.

14. A process according to claim 3, wherein step (d) is carried out at a temperature in the range of from 0 to 200°

C.

15. A process according to claim 2, wherein the operating pressure during step (d) is in the range of from 1 to 150 bar (absolute).

16. A process according to claim 3, wherein the operating pressure during step (d) is in the range of from 1 to 150 bar (absolute).

17. A process according to claim 4, wherein the operating pressure during step (d) is in the range of from 1 to 150 bar (absolute).

18. A process according to claim 2, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial off-gas.

19. A process according to claim 3, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial off-gas.

20. A process according to claim 4, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial off-gas.

21. A process according to claim 5, wherein in step (d) the calcium oxide-depleted solid waste material is contacted with a carbon dioxide-containing industrial off-gas.