Hydrate-Phase Equilibria and 13C NMR Studies of Binary (CH4 + C2H4) and (C2H6 + C2H4) Hydrates

被引：13
作者：
Kang, Seong-Pil [1 ]
Lee, Jong-Won [2 ]
机构：
[1] Korea Inst Energy Res, Carbon Capture & Storage Res Ctr, Taejon 305343, South Korea
[2] Kongju Natl Univ, Dept Environm Engn, Cheonan 331717, Chungnam, South Korea
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2013年 / 52卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
CARBON-DIOXIDE; CAGE OCCUPANCY; GAS HYDRATE; METHANE; TETRAHYDROFURAN; SYSTEM; WATER; RAMAN; TRANSITION; STABILITY;
D O I：
10.1021/ie302858p
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Three-phase equilibria of hydrate + liquid water + vapor phases were investigated at various gas compositions for binary gas mixtures of (CH4 + C2H4) and (C2H6 + C2H4). Hydrate-phase equilibria of the binary (CH4 + C2H4) hydrate show significant changes with changing composition, whereas those of binary (C2H6 + C2H4) hydrates show little difference because of the similar physical properties of the two guest species. In addition to macroscopic equilibrium measurements, solid-state C-13 NMR spectra of hydrate samples were collected to identify both cavity occupancies of guest components and hydrate structures. For the binary (CH2 + C2H4) hydrate, the large-cavity occupancy of C2H4 molecules increased nonlinearly with increasing C2H4 concentration, which supports nonlinear shifts of the equilibrium curves. Meanwhile, the large-cavity occupancy of C2H4 molecules from the (C2H6 + C2H4) gas mixtures increased linearly with increasing C2H4 concentration, which is attributed to linear changes in the distribution or density.
引用
收藏
页码：303 / 308
页数：6
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