Conductivity measurements on H2O-bearing CO2-rich fluids

Capobianco, Ryan M.; Bodnar, Robert J.; Rimstidt, J. Donald

doi:10.1007/s10953-014-0219-7

Title: Conductivity measurements on H₂O-bearing CO₂-rich fluids

Journal Article · Wed Sep 10 00:00:00 EDT 2014 · Journal of Solution Chemistry

DOI:https://doi.org/10.1007/s10953-014-0219-7· OSTI ID:1185429

Capobianco, Ryan M. ^[1]; Bodnar, Robert J. ^[1]; Rimstidt, J. Donald ^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Recent studies report rapid corrosion of metals and carbonation of minerals in contact with carbon dioxide containing trace amounts of dissolved water. One explanation for this behavior is that addition of small amounts of H₂O to CO₂ leads to significant ionization within the fluid, thus promoting reactions at the fluid-solid interface analogous to corrosion associated with aqueous fluids. The extent of ionization in the bulk CO₂ fluid was determined using a flow-through conductivity cell capable of detecting very low conductivities. Experiments were conducted from 298 to 473 K and 7.39 to 20 MPa with H₂O concentrations up to ~1600 ppmw (xH₂O ≈ 3.9 x 10^-3), corresponding to the H₂O solubility limit in liquid CO₂ at ambient temperature. All solutions showed conductivities <10 nS/cm, indicating that the solutions were essentially ion-free. Furthermore, this observation suggests that the observed corrosion and carbonation reactions are not the result of ionization in CO₂-rich bulk phase, but does not preclude ionization in the fluid at the fluid-solid interface.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185429

Journal Information:: Journal of Solution Chemistry, Vol. 44, Issue 5; ISSN 0095-9782

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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