High-Pressure Phase Equilibrium and Raman Spectroscopic Studies on the 1,1-Difluoroethane (HFC-152a) Hydrate System

被引：9
|
作者：
Sugahara, Takeshi [1 ]
Endo, Aki [1 ]
Miyauchi, Hiroshi [1 ]
Choi, Seung An [1 ]
Matsumoto, Yuuki [1 ]
Yasuda, Kenjiro [1 ]
Hashimoto, Shunsuke [1 ]
Ohgaki, Kazunari [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn Sci, Div Chem Engn, Dept Mat Engn Sci, Toyonaka, Osaka 5608531, Japan
来源：
JOURNAL OF CHEMICAL AND ENGINEERING DATA | 2011年 / 56卷 / 12期
关键词：
CAGE OCCUPANCY; STABILITY; HFC-134A;
D O I：
10.1021/je200543d
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
High-pressure phase equilibrium relations of the 1,1-difluoroethane (HFC-152a) + water binary system were investigated in a temperature range of (275.03 to 319.30) K and a pressure range up to 370 MPa. Four three-phase coexisting curves of hydrate + aqueous + gas phases, hydrate + HFC-152a-rich liquid + gas phases, hydrate + aqueous + HFC-152a-rich liquid phases, and aqueous + HFC-152a-rich liquid + gas phases originate from the quadruple point of hydrate + aqueous + HFC-152a-rich liquid HFC-152a + gas phases located at (288.05 +/- 0.15) K and (0.44 +/- 0.01) MPa. The structure of HFC-152a hydrate remains structure I (s-I) in the pressure range up to 370 MPa. Raman spectra of the HFC-152a molecule in the HFC-152a hydrate indicate that the HFC-152a molecules occupy only large cages of s-I HFC-152a hydrate in the presence of completely vacant small cages at a pressure up to 370 MPa.
引用
收藏
页码：4592 / 4596
页数：5
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