2-Propanol As a Co-Guest of Structure II Hydrates in the Presence of Help Gases
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- 2-Propanol As a Co-Guest of Structure II Hydrates in the Presence of Help Gases
- Lee, Youngjun; Lee, Seungmin; Park, Sungwon; Kim, Yunju; Lee, Jong-Won; Seo, Yongwon
- 2-propanol; Analytical method; Chemical formulae; Hydrate inhibitors; NMR spectrum; Powder X-ray diffraction (pXRD); Stoichiometric concentration
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF PHYSICAL CHEMISTRY B, v.117, no.8, pp.2449 - 2455
- The enclathration of 2-propanol (2-PrOH) as a co-guest of structure II (sII) hydrates in the presence of CH4 and CO2 was experimentally verified with a focus on macroscopic phase behaviors and microscopic analytical methods such as powder X-ray diffraction (PXRD) and NMR spectroscopy. 2-PrOH functioned as a hydrate promoter in the CH4 + 2-PrOH systems, whereas it functioned as an apparent hydrate inhibitor in the CO2 + 2-PrOH systems despite the inclusion of 2-PrOH in the hydrate lattices. From the PXRD patterns, both double CH4 + 2-PrOH and double CO2 + 2-PrOH hydrates were identified to be cubic (Fd3m) sII hydrates. From the C-13 NMR spectra, it was found that, at a lower 2-PrOH concentration, the small 5(12) cages of the sII hydrate were occupied by CH4 molecules only, whereas the large 5(12)6(4) cages were shared by CH4 and 2-PrOH molecules. However, at a stoichiometric concentration, the large cages were occupied by 2-PrOH molecules only, and the corresponding chemical formula for this concentration is 1.50CH(4).0.98 2-PrOH.17H(2)O.
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