The Open Thermodynamics Journal

2008, 2 : 17-21
Published online 2008 April 1. DOI: 10.2174/1874396X00802010017
Publisher ID: TOTHERJ-2-17

Isothermal Phase Equilibria and Cage Occupancies for CH4 + CHF3 Mixed-Gas Hydrate System

Takashi Makino , Yuuki Kunita , Takeshi Sugahara and Kazunari Ohgaki
Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka 560-8531, Japan.

ABSTRACT

Isothermal phase equilibria for the CH4 + CHF3 mixed-gas hydrate system were investigated under three-phase equilibrium states at 291.1 K by using gas chromatography. In addition, the single-crystals of mixed-gas hydrate were analyzed by means of Raman spectroscopy. One of the most important findings in the present study is that there is no hydrate- structural transition, as the composition of mixed gas was varied at 291.1 K in the CH4 + CHF3 mixed-gas hydrate system.