Phase equilibrium for structure-H hydrate formed with krypton and 2,2-dimethylbutane

Ryo Ohmura, Satoshi Takeya, Tatsuo Maekawa, Tsutomu Uchida

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20 Citations (Scopus)


The temperature and pressure conditions for vapor + liquid + liquid + hydrate four-phase equilibrium in the krypton + 2,2-dimethylbutane + water system have been measured over the temperatures from 273.5 K to 285.6 K. The four-phase equilibrium pressure at a given temperature is lower by 1 MPa to 2.1 MPa than the corresponding equilibrium pressure of structure-II hydrate-forming krypton + water system without 2,2-dimethylbutane. This reduction in the equilibrium pressure due to the addition of 2,2-dimethylbutane suggests the formation of a structure-H hydrate containing krypton as a small-molecule guest and 2,2-dimethylbutane as a large-molecule guest substance. The formation of structure-H hydrate has been confirmed by means of X-ray diffraction measurement.

Original languageEnglish
Pages (from-to)161-163
Number of pages3
JournalJournal of Chemical and Engineering Data
Issue number1
Publication statusPublished - 2006 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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