Phase Equilibrium Relations and Structural Transition in the 1,1,1,2-Tetrafluoroethane Hydrate System

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• 作者：Yoshito Katsuta ; Sumihiro Suzuki ; Yuuki Matsumoto ; Shunsuke Hashimoto ; Takeshi Sugahara ; Kazunari Ohgaki
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：May 9, 2013
• 年：2013
• 卷：58
• 期：5
• 页码：1378-1381
• 全文大小：209K
• 年卷期：v.58,no.5(May 9, 2013)
• ISSN：1520-5134

文摘

The three-phase (hydrate, aqueous, and HFC-134a-rich liquid phases) equilibrium relations of the 1,1,1,2-tetrafluoroethane (HFC-134a) + water binary system were measured in a pressure range up to 293 MPa. The HFC-134a hydrate has a structural phase transition point from structure-II to structure-I at (65 卤 1) MPa and (282.2 卤 0.1) K, where the slope of the three-phase equilibrium curve is drastically changed. The Raman spectra of the HFC-134a molecule in the structure-I HFC-134a hydrate phase indicate that HFC-134a molecule occupies only large cage of structure-I at a pressure up to 293 MPa.