Iron Sulfide Precipitation Kinetics, Solubility, Phase Transformation, and Corrosion versus Temperature and Ionic Strength

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dc.contributor.advisorTomson, Mason B.en_US
dc.creatorLiu, Yaen_US
dc.date.accessioned2017-08-01T18:45:13Zen_US
dc.date.available2017-08-01T18:45:13Zen_US
dc.date.created2017-05en_US
dc.date.issued2017-04-13en_US
dc.date.submittedMay 2017en_US
dc.date.updated2017-08-01T18:45:13Zen_US
dc.description.abstractA reliable anoxic plug flow reactor has been developed to study iron sulfide (FeS) precipitation kinetics, solubility, phase transformation, and corrosion simultaneously. The effects of temperature (23 – 125 °C), ionic strength (0.00886 – 5.03 mol/kg), and ferrous iron (Fe(II)) to sulfide (S(-II)) concentration ratio (1:20 to 1:5) were studied. The kinetics of FeS precipitation was found to be a pseudo first order reaction with respect to Fe(II) concentration, when Fe(II) concentration is significantly lower than S(-II) concentration. FeS precipitation kinetics can be accelerated by high temperature and high ionic strength, but not be affected by Fe(II) to S(-II) concentration ratio at the tested ratio range. A model for predicting FeS solubility and precipitation was developed by using FeS solubility data measured in this study and data from literature. At temperature ≤ 100 °C, freshly precipitated FeS was found to be mackinawite. Mackinawite can transform to troilite at temperature ≥ 50 °C, and low ionic strength favors the phase transformation. Also, mackinawite formed from steel corrosion seems to be easier to transform to troilite than the mackinawite formed from precipitation. H2S corrosion and FeS scale retention on carbon steel can be significantly accelerated by high temperature and impeded by extra high ionic strength (IS ≥ 4 mol/kg). This study presented a new approach for iron sulfide study and contributed valuable FeS thermodynamics and kinetics data for FeS prediction and control in industry.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLiu, Ya. "Iron Sulfide Precipitation Kinetics, Solubility, Phase Transformation, and Corrosion versus Temperature and Ionic Strength." (2017) Diss., Rice University. <a href="https://hdl.handle.net/1911/96116">https://hdl.handle.net/1911/96116</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/96116en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectiron sulfideen_US
dc.subjectprecipitation kineticsen_US
dc.subjectsolubilityen_US
dc.subjectphase transformationen_US
dc.subjectcorrosionen_US
dc.subjectdepositionen_US
dc.subjectanoxic.en_US
dc.titleIron Sulfide Precipitation Kinetics, Solubility, Phase Transformation, and Corrosion versus Temperature and Ionic Strengthen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentCivil and Environmental Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.majorEnvironmental Engineeringen_US
thesis.degree.nameDoctor of Philosophyen_US
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