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Abstract

Mineral trapping of carbon dioxide is the safest and the most permanent sequestration mechanism. Brine composition, brine pH, system temperature and pressure have been reported to have significant effects on mineral trapping of CO2 in brines. It has also been reported that iron cation in brine could cause pH instability that may lead to lower carbonation conversion rate. This study aims to investigate whether ferric or ferrous iron caused this pH instability. pH stability studies and high temperature/high pressure carbonation experiments (150°C,100bar) with the addition of 1.0M KOH were conducted using different synthetic brines with Fe3+, Fe2+, and without Fe. It can be concluded from this study that ferrous iron causes pH instability. However, ferrous iron might promote carbonate precipitation in non-pure CO2 streams in iron oxyhydroxide-containing saline aquifers as seal leakage mitigation.

Original languageEnglish
Pages (from-to)5490-5494
Number of pages5
JournalEnergy Procedia
Volume63
DOIs
Publication statusPublished - 2014
Event12th International Conference on Greenhouse Gas Control Technologies - Austin, Texas, United States
Duration: 5 Oct 20149 Oct 2014

Keywords

  • CO storage
  • Leakage mitigation
  • Mineral trapping
  • Ph instablity

ASJC Scopus subject areas

  • Energy(all)

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