کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6619516 | 460528 | 2016 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase equilibrium and Raman spectroscopic studies of semi-clathrate hydrates for methane, nitrogen and tetra-butyl-ammonium fluoride
ترجمه فارسی عنوان
تعادل فاز و مطالعات اسپکتروسکوپی رامان از هیدراتهای نیمه کلراترات برای متان، نیتروژن و تترا-بوتیل آمونیوم فلوراید
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The experimental study on phase equilibrium conditions for semi-clathrate hydrates formed in the systems of CH4/N2 gas mixture and tetra-butyl-ammonium fluoride (TBAF) with different ratios (0.210, 0.293 and 0.500Â mol%) to water was conducted in this paper. The experiments were carried out under the conditions of 281.15-291.15Â K and 0.30-3.70Â MPa. The structures of the hydrates were characterized using in-situ Raman spectroscopy at 276.15Â K and 2.50Â MPa. At a certain given pressure, the equilibrium temperature of the semi-clathrate hydrates formed in the systems with 0.500Â mol% TBAF is significantly higher than that of semi-clathrate hydrates formed the systems with 0.210 or 0.293Â mol% TBAF, and even higher than that of structure II hydrates formed in the systems with THF-SDS. Moreover, TBAF has more positive influence on enhancing dissociation enthalpies of the hydrates than THF. Due to the quite weak signal of N-N triple bond vibration or/and seldom N2 molecules encaged into the cavities, only CH4 molecules could be determined clearly in the mixed hydrates. In addition, the crystal morphology of the semi-clathrate hydrates is affected by the ratio of TBAF to water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 413, 15 April 2016, Pages 48-52
Journal: Fluid Phase Equilibria - Volume 413, 15 April 2016, Pages 48-52
نویسندگان
Jing Cai, Chun-Gang Xu, Ya-Fei Hu, Ya-Long Ding, Xiao-Sen Li,