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CO2 hydrate composite for ocean carbon sequestration.

Sangyong Lee1, Liyuan Liang, David Riestenberg

  • 1Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6181, USA.

Environmental Science & Technology
|September 5, 2003
PubMed
Summary
This summary is machine-generated.

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Researchers developed a method for rapid carbon dioxide (CO2) hydrate formation to create sinking CO2-seawater mixtures for ocean sequestration. This process offers improved CO2 dispersal and reduced environmental impact compared to direct liquid CO2 injection.

Area of Science:

  • Oceanography
  • Chemical Engineering
  • Environmental Science

Background:

  • Direct ocean sequestration of liquid carbon dioxide (CO2) presents challenges due to its positive buoyancy.
  • Understanding CO2 hydrate formation is crucial for developing effective deep-ocean CO2 storage strategies.

Purpose of the Study:

  • To investigate rapid CO2 hydrate formation for producing negatively buoyant CO2-seawater mixtures.
  • To simulate direct CO2 injection at intermediate ocean depths (1.0-1.3 km).

Main Methods:

  • A coflow reactor was designed to inject water droplets into liquid CO2 for hydrate production.
  • The process involved forming water-encased CO2 hydrate particles that aggregated into a paste-like composite.
  • The composite was extruded into ambient water, forming sinking cylindrical masses.

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Main Results:

  • CO2 hydrate conversion increased with water flow rate, pressure, and residence time, and decreased with CO2 flow rate.
  • Enhanced mixing intensity (Reynolds number) improved mass transfer and CO2 conversion.
  • Plume modeling indicated that hydrate composite particles would dissolve and sink 350 m, suggesting better dispersal.

Conclusions:

  • The CO2 hydrate composite formation offers a promising method for negatively buoyant CO2 sequestration in the ocean.
  • This approach could lead to reduced environmental impacts compared to direct liquid CO2 discharge.
  • Further research is required on efficiency, scalability, longevity, and ecological effects before practical application.