Process for Sequestration of Carbon Dioxide by Mineral Carbonation

• US 20070261947A1
• Filed: 11/21/2006
• Published: 11/15/2007
• Est. Priority Date: 11/23/2005
• Status: Active Grant

• Current Assignee: Shell Oil Company (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Wesker, Evert, GEERLINGS, Jacobus
• Granted Patent: US 7,722,850 B2
• Time in Patent Office: Days
• US Class Current: 201/14
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01J 20/10 comprising silica or silicate
• CPC Class Codes: C01B 33/22 Magnesium silicates
• CPC Class Codes: C01B 33/24 Alkaline-earth metal silicates
• CPC Class Codes: C01F 11/18 Carbonates
• CPC Class Codes: C01F 5/24 Magnesium carbonates
• CPC Class Codes: C10J 2300/0983 Additives
• CPC Class Codes: C10J 3/463 in stationary fluidised beds
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The invention provides a process for sequestration of carbon dioxide by mineral carbonation comprising the following steps: (a) converting a magnesium or calcium sheet silicate hydroxide into a magnesium or calcium ortho- or chain silicate by bringing the silicate hydroxide in direct or indirect heat-exchange contact with hot synthesis gas to obtain the silicate, silica, water and cooled synthesis gas; (b) contacting the silicate obtained in step (a) with carbon dioxide to convert the silicate into magnesium or calcium carbonate and silica.

Claims

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

(a) converting a magnesium or calcium sheet silicate hydroxide into a magnesium or calcium ortho- or chain silicate by bringing the silicate hydroxide in direct or indirect heat-exchange contact with hot synthesis gas to obtain the silicate, silica, water and cooled synthesis gas;

(b) contacting the silicate obtained in step (a) with carbon dioxide to convert the silicate into magnesium or calcium carbonate and silica.

2. A process according to claim 1, wherein the silicate hydroxide is serpentine and the silicate is olivine.

3. A process according to claim 1, wherein the silicate hydroxide is talc and the silicate is enstatite.

4. A process according to claim 1, wherein the hot synthesis gas has a temperature in the range of from 900 to 1600°

C.

5. A process according to claim 1, wherein the cooled synthesis gas has a temperature of at least 550°

C.

6. A process according to claim 1, wherein step (a) is carried out by directly contacting hot synthesis gas with a fluidised bed of silicate hydroxide particles.

7. A process according to claim 6, wherein the fluidised bed has a temperature in the range of from 600 to 800°

C. and wherein the silicate hydroxide is serpentine and the silicate is olivine.

8. A process according to claim 6, wherein the fluidised bed has a temperature in the range of from 800 to 1000°

C. and wherein the silicate hydroxide is talc and the silicate is enstatite.

9. A process according to claim 6, wherein the silicate hydroxide particles have an average diameter in the range of from 30 to 300 μ

m.

10. A process according to claim 1, wherein the cooled synthesis gas is subjected to water-gas shift conversion to obtain carbon dioxide and hydrogen-enriched synthesis gas and wherein carbon dioxide obtained in the water-gas shift conversion is contacted with the silicate in step (b).

11. A process according to claim 10, wherein water obtained in step (a) is used as reactant for the water-gas shift conversion.

12. A process according to claim 1, wherein the hot synthesis gas is obtained by coal gasification.

13. A process according to claim 10, wherein the hydrogen-enriched synthesis gas is converted into hydrocarbons by a Fischer-Tropsch process and wherein the hot synthesis gas is obtained by coal gasification.

14. A process according to claim 10, wherein hydrogen is produced from the hydrogen-enriched synthesis gas and wherein the hot synthesis gas is obtained by coal gasification.

15. A process according to claim 10, wherein the hydrogen-enriched synthesis gas is supplied to a gas turbine to generate power and wherein the hot synthesis gas is obtained by coal gasification.

16. A process according to claim 1, wherein the cooled synthesis gas is further cooled in heat-exchange contact with silicate hydroxide that is to be supplied to step (a).

17. A process according to claim 1, wherein the cooled synthesis gas has a temperature in the range of from 550 to 800°

C.

18. A process according to claim 6, wherein the silicate hydroxide particles have an average diameter in the range of from 50 to 150 μ

m.

19. A process according to claim 2, wherein the hot synthesis gas has a temperature in the range of from 900 to 1600°

C.

20. A process according to claim 3, wherein the hot synthesis gas has a temperature in the range of from 900 to 1600°

C.