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Production of CO 2 Hydrates in Aqueous Mixtures Having (NH 4 ) 2 SO 4 at Different Concentrations; Definition of Consequences on the Process Evolution, Quantification of CO 2 Captured and Validation of Hydrates Production as Technique for Ammonium Removal from Waste Water

Author

Listed:
  • Alberto Maria Gambelli

    (Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Xhino Rushani

    (Engineering Department, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Daniela Pezzolla

    (Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Federico Rossi

    (Engineering Department, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Giovanni Gigliotti

    (Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

Abstract

Carbon dioxide hydrates were formed in fresh water and in aqueous mixtures containing ammonium sulfate, at concentrations equal to 1.9, 6.3, and 9.5 wt%. The moles of hydrates formed were compared, to define the inhibiting strength of the electrolyte solution and the dependence of inhibition from concentration. The addition of salt strongly inhibited the process and the number of hydrates produced passed from 0.204–0.256 moles, obtained in fresh water, to 0.108–0.198 moles, obtained at the lowest concentration tested. The further addition of salt still lowered the production of the hydrates; at the highest concentration tested, only 0.092–0.177 moles were obtained. The pressure-temperature evolutions of the hydrates were then discussed and compared with the ideal process and with the experimental results obtained in demineralised water. Finally, further samples of CO 2 hydrates, produced in the presence of 9.5 wt% salt in the aqueous phase (corresponding to 1.5 wt% NH 4 + ), were recovered and dissociated in a separated environment. The liquid phase, resulting from their dissociation, was subjected to spectrophotometric analyses. Its NH 4 + content was measured and compared with the initial concentration in water. Therefore, it was possible to quantify the capability of the system to remove the (NH 4 ) 2 SO 4 from the water (involved in hydrate formation) and to concentrate it in the remaining liquid phase. Considering the portion of water involved in hydrates formation, the concentration of ammonium passed from 1.5 wt% to 0.38–0.449 wt%.

Suggested Citation

  • Alberto Maria Gambelli & Xhino Rushani & Daniela Pezzolla & Federico Rossi & Giovanni Gigliotti, 2023. "Production of CO 2 Hydrates in Aqueous Mixtures Having (NH 4 ) 2 SO 4 at Different Concentrations; Definition of Consequences on the Process Evolution, Quantification of CO 2 Captured and Validation o," Sustainability, MDPI, vol. 15(12), pages 1-26, June.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:12:p:9841-:d:1175414
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    References listed on IDEAS

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