Phase equilibrium condition measurements in carbon dioxide hydrate forming system coexisting with seawater

Rihito Nakane, Yusuke Shimosato, Eito Gima, Ryo Ohmura, Izuru Senaha, Keita Yasuda

Research output: Contribution to journalArticle

Abstract

Three phase equilibrium conditions of synthetic standard (seawater + carbon dioxide hydrate + carbon dioxide gas) were experimentally determined based on the batch, isochoric procedure. The total mass fraction of the electrolytes in the synthetic standard seawater, wss, was 0.0351, 0.0700, or 0.1036 that was composed of pure water and seven salts. The equilibrium pressure–temperature conditions were as follows: 271.95 K < T < 279.05 K and 1.298 MPa < p < 3.144 MPa in the system having wss = 0.0351, 272.25 K < T < 278.15 K and 1.530 MPa < p < 3.361 MPa in the wss = 0.0700 system and 271.15 K < T < 275.65 K and 1.643 MPa < p < 2.909 MPa in the wss = 0.1036 system. The quantitative evaluation of the changes in the equilibrium temperature at a fixed pressure was performed by applying the equilibrium conditions to the Clausius–Clapeyron equation. The results are essential to design the thermodynamic conditions for the clathrate hydrate-based seawater desalination technology.

Original languageEnglish
Article number106276
JournalJournal of Chemical Thermodynamics
Volume152
DOIs
Publication statusPublished - 2021 Jan

Keywords

  • Carbon dioxide
  • Clathrate hydrates
  • Phase equilibrium
  • Seawater desalination
  • Synthetic seawater

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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