Ocean disposal of CO2: Conditions for producing sinking CO 2 hydrate

Jorge Gabitto, David Riestenberg, Sangyong Lee, Liyuan Liang, Costas Tsouris

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Carbon dioxide sequestration at intermediate ocean depths in the form of a sinking CO2 stream has been shown to be technically feasible. Buoyancy characteristics of CO2 hydrate particles obtained from a coflow reactor operating under conditions that produce negatively buoyant CO2 hydrate composite particles were studied. Using a simplified process model, the limiting ratios of CO 2 to water to produce sinking hydrate composite streams were established for pressure and temperature conditions of intermediate ocean depths. A kinetic model involving a mass transfer step and a reaction step was proposed to explain experimental data using a seafloor process simulator. Results suggest that the reactor operates under mass-transfer controlled conditions. Although the density of freshwater is only a few percentage units less than that of seawater, operating conditions derived from freshwater-based studies are significantly different for ambient seawater. Owing to the higher density of seawater, greater conversion of CO2 to hydrate is needed to obtain a sinking CO2 composite stream than at the same depth of freshwater.

Original languageEnglish
Pages (from-to)703-712
Number of pages10
JournalJournal of Dispersion Science and Technology
Volume25
Issue number5
DOIs
StatePublished - Sep 2004

Keywords

  • CO hydrate
  • Mass transfer
  • Ocean carbon sequestration

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