Hydrate phase equilibrium in the system of (carbon dioxide + 2,2-dimethylbutane + water) at temperatures below freezing point of water

Renkai Shen, Kyoichi Tezuka, Tsutomu Uchida, Ryo Ohmura

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The four-phase equilibrium conditions of (vapor + liquid + hydrate + ice) were measured in the system of (CO 2 + 2,2-dimethylbutane + water). The measurements were performed within the temperature range (254.2 to 270.2) K and pressure range (0.490 to 0.847) MPa using an isochoric method. Phase equilibrium conditions of hydrate formed in this study were measured to be at higher temperatures and lower pressures than those of structure I CO 2 simple hydrate. The largest difference in the equilibrium pressures of structure I CO 2 hydrate and the hydrate formed in the present study was 0.057 MPa at T = 258.3 K. On the basis of the four-phase equilibrium data obtained, the quintuple point for the (ice + structure I hydrate + structure H hydrate + liquid + vapor) was also determined to be T = 266.4 K and 0.864 MPa. The results indicate that structure H hydrate formed with CO 2 and 2,2-dimethylbutane is stable exclusively at the temperatures below the quintuple temperature.

Original languageEnglish
Pages (from-to)27-29
Number of pages3
JournalJournal of Chemical Thermodynamics
Volume53
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • Carbon dioxide
  • Clathrate hydrates
  • Phase equilibrium

ASJC Scopus subject areas

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

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