Thermodynamic stability and characterization of double clathrate hydrate with carbon dioxide + cyclopentane + deuterium oxide

Meku Maruyama, Shun Nagayama, Takuma Misawa, Satoshi Takeya, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

Abstract

This paper reports characterization of clathrate hydrate formed in CO2 + cyclopentane + deuterium oxide (D2O) system with the phase equilibrium determination and the powder X-ray diffraction (PXRD) measurements towards the development of hydrate-based tritium separation technology. Four-phase (CO2 gas + liquid cyclopentane + liquid D2O + hydrate) equilibrium conditions were measured using the isochoric procedure in the pressure range from 0.279 MPa to 2.735 MPa and the temperature range from 285.35 K to 293.65 K. The equilibrium temperature of CO2 + cyclopentane + D2O system is always higher by 2.0 K to 2.4 K compared to that of CO2 + cyclopentane + H2O system. The detailed crystallographic properties of both CO2 + cyclopentane + D2O hydrate and CO2 + cyclopentane + H2O hydrate including the lattice constants, the radii and volumes of each cage and the cage occupancy were estimated by the PXRD analysis. Based on the obtained results, implications for the development and operation of D2O-hydrate-based process are discussed.

Original languageEnglish
Article number106998
JournalJournal of Chemical Thermodynamics
Volume179
DOIs
Publication statusPublished - 2023 Apr

Keywords

  • Carbon dioxide
  • Clathrate hydrate
  • Cyclopentane
  • Deuterium oxide
  • Phase equilibrium
  • Powder X-ray diffraction

ASJC Scopus subject areas

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

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