Structural transition and phase behavior of N-2 gas hydrates with pinacolyl alcohol and tert-amyl alcohol 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Fluid Phase Equilibria
年/卷/期
2015 / 393 /
页码
85-90
ISSN号
0378-3812
作者单位
Ulsan Natl Inst Sci & Technol, Sch Urban & Environm Engn, Ulsan 689798, South Korea;Korea Polar Res Inst, Div Polar Earth Syst Sci, Inchon 406840, South Korea;Ulsan Natl Inst Sci & Technol, Sch Urban & Environm Engn, Ulsan 689798, South Korea;
作者
Kim, Eunae;Jin, Young Keun;Seo, Yongwon;
摘要
The influences of large molecular alcohols (LMAs) (pinacolyl alcohol (PCA) and tert-amyl alcohol (tAA)) on N-2 hydrate were examined with a primary focus on the hydrate phase equilibria and structural transition. The four-phase (H-L-w-L-LMA-V) equilibria of the N-2 + PCA + water and N-2 + tAA + water systems were experimentally measured in order to determine the thermodynamic stability conditions of the N-2 hydrates with LMAs. The H-L-w-L-LMA-V curves of both N-2 + PCA and N-2 + tAA hydrates were significantly shifted to more thermodynamically stable regions. Powder X-ray diffraction (PXRD) and Raman analyses verified that the structure of N-2 hydrates with LMAs was transformed from the original structure of sII to sH (P6/mmm) as a result of the inclusion of LMAs. In addition, the formation of sH hydrate from the N-2 + PCA + water system was further verified using an endothermic dissociation thermogram from a high pressure micro-differential scanning calorimeter (HP mu-DSC) by confirming the appearance of three distinct peaks that correspond to ice, sII hydrate, and sH hydrate. Therefore, the experimental results that were obtained in this study are expected to be informative for understanding the roles of LMAs in affecting the macroscopic hydrate phase behavior and microscopic hydrate structure. (C) 2015 Elsevier B.V. All rights reserved.
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关键词/主题词
Pinacolyl alcohol;tert-Amyl alcohol;Nitrogen;sH hydrate;Structural transition;
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