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

研究成果: Article査読

16 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)27-29
ページ数3
ジャーナルJournal of Chemical Thermodynamics
53
DOI
出版ステータスPublished - 2012 10

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 材料科学(全般)
  • 物理化学および理論化学

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