Equilibrium properties and crystal growth of D2O + cyclopentane hydrate for sustainable tritium separation

Meku Maruyama, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


This study reports thermodynamic properties and crystal growth observations of D2O + cyclopentane hydrate toward the development of a hydrate-based tritium separation process. We employed D2O as a host of hydrate with respect to the investigation into the formation of D2O hydrate substrate, which is a core component of the tritium separation process. The hydrate phase equilibrium temperature in the liquid D2O + liquid cyclopentane system was 3.2°C higher than the corresponding H2O hydrate. Experiments on crystal growth were conducted at temperatures ranging from 5.1 to 8.5°C under atmospheric pressure. Under each thermodynamic condition, polygonal hydrate crystals appeared, growing along the D2O/cyclopentane interface. The geometric shape and size of the crystals varied depending on the temperature. The variation in crystal morphology was comparable to that of the H2O + cyclopentane hydrate. Implications based on the obtained results for the hydrate-based isotopic water separation process design are discussed.

Original languageEnglish
Pages (from-to)718-725
Number of pages8
JournalCanadian Journal of Chemical Engineering
Issue number2
Publication statusPublished - 2023 Feb


  • clathrate hydrate
  • crystal growth
  • phase equilibrium properties
  • process design
  • tritium separation

ASJC Scopus subject areas

  • Chemical Engineering(all)


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