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Towards energy-efficient hydrate-based desalination: A comprehensive study on binary hydrate formers with propane as a promoter

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Listed:
  • He, Tianbiao
  • Xing, Xialian
  • Xu, Hao
  • Mao, Ning
  • Qi, Meng
  • Zhang, Jibao
  • Yin, Zhenyuan

Abstract

Hydrate-based desalination technology has garnered significant attention due to its energy efficiency and the ready availability of hydrate formers. This research investigated the kinetics of different binary hydrates (CO2 + C3H8, N2 + C3H8, and Ar + C3H8) using propane as a promoter, aiming to enhance the desalination efficiency and reduce the energy cost. Experiments were conducted at temperatures ranging from 275.15 K to 279.15 K and initial pressures from 2.5 to 4.0 MPa. The formation rate and water-to-hydrate conversion of binary hydrates in a 3.5 wt% brine system were evaluated across different propane ratios (10%, 15%, and 19%) and stirring rates (0–600 rpm). Results indicated that a temperature of 275.15 K and a pressure of 4.0 MPa fostered optimal hydrate kinetics. Additionally, increasing the propane ratio from 10% to 19% positively influenced N2 + C3H8 and Ar + C3H8 hydrate formation kinetics due to enhanced phase equilibrium. For CO2 + C3H8, while the final water conversion rate increased with added propane, the formation rate and amount of hydrates formed within one hour for the 81% CO2 + 19% C3H8 combination decreased. Stirring enhanced nucleation and growth for N2 + C3H8 but remained ineffective for CO2 + C3H8. Among hydrate formers of the same ratio, CO2 + C3H8, with its higher solubility, emerged as superior in terms of both lower formation pressure and faster formation kinetics, achieving greater water-to-hydrate conversion in minimal time. This study offers valuable insights for choosing optimal experimental conditions and binary hydrate formers to fast-track the kinetics of hydrate formation and energy-efficient in hydrate-based desalination technology.

Suggested Citation

  • He, Tianbiao & Xing, Xialian & Xu, Hao & Mao, Ning & Qi, Meng & Zhang, Jibao & Yin, Zhenyuan, 2024. "Towards energy-efficient hydrate-based desalination: A comprehensive study on binary hydrate formers with propane as a promoter," Applied Energy, Elsevier, vol. 375(C).
    • Handle: RePEc:eee:appene:v:375:y:2024:i:c:s0306261924014247
    DOI: 10.1016/j.apenergy.2024.124041
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    References listed on IDEAS

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