Dissociation conditions and Raman spectra of CO2 + SO2 and CO2 + H2S hydrates

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DOIResolve DOI: http://doi.org/10.1021/acs.iecr.5b00350
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TypeArticle
Journal titleIndustrial and Engineering Chemistry Research
ISSN0888-5885
Volume54
Issue21
Pages55435549; # of pages: 7
SubjectChromatography; Gas chromatography; Gas hydrates; Hydration; Impurities; Raman scattering; X ray diffraction; Dissociation conditions; Dissociation methods; Equilibrium point; Gas compositions; Gas pressures; Hydrate phase; Low concentrations; Powder X ray diffraction; Gases
AbstractTo further define the information needed for CO<inf>2</inf> gas sequestration and storage in the presence of impurities, the stability of hydrates made from CO<inf>2</inf> + SO<inf>2</inf> and CO<inf>2</inf> + H<inf>2</inf>S mixtures was measured by an isochoric dissociation method. The hydrates were characterized with powder X-ray diffraction, confirming that CO<inf>2</inf> + SO<inf>2</inf> formed a structure I hydrate. The Raman spectra of CO<inf>2</inf> + SO<inf>2</inf> and CO<inf>2</inf> + H<inf>2</inf>S hydrates were also measured along with those of THF + CO<inf>2</inf> + SO<inf>2</inf> and THF + CO<inf>2</inf> + H<inf>2</inf>S hydrates to observe and assign the Raman peaks of SO<inf>2</inf> or H<inf>2</inf>S in the small cages. It was found the SO<inf>2</inf> Raman peaks are at 1147.1 and 1155.4 cm-1 in large and small cages, respectively; the H<inf>2</inf>S Raman peaks are at 2594.0 and 2603.0 cm-1 in large and small cages, respectively. At the equilibrium points established, the composition of the released gas mixture was analyzed by gas chromatography. Measurements for gas pressures (ranging from 0.72 to 3.59 MPa) and gas compositions (ranging from 0.04% to 7.63%, mole fraction of SO<inf>2</inf> or H<inf>2</inf>S) at specific temperatures (ranging from 263.15 to 283.15 K) are reported. The SO<inf>2</inf> and H<inf>2</inf>S impurities tend to stabilize the mixed CO<inf>2</inf> hydrates formed, with almost all of the impurity gases reporting with the hydrate phase at low concentrations.
Publication date
PublisherACS Publications
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21275784
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Record identifierd7e6476c-b16a-4674-b4ee-3a57e0a3d8d7
Record created2015-07-14
Record modified2016-05-09
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