Spectroscopic Observation of the Hydroxy Position in Butanol Hydrates and Its Effect on Hydrate Stability |
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| Authors: | Yeobum Youn Prof. Minjun Cha Prof. Huen Lee |
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| Affiliation: | 1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‐ro, Yuseong‐gu, Daejeon 305‐701 (Republic of Korea);2. Department of Energy and Resources Engineering, Kangwon National University, 1 Kangwondaehak‐gil, Chuncheon‐si, Gangwon‐do, 200‐701 (Republic of Korea) |
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| Abstract: | In this study, we investigate the crystal structures and phase equilibria of butanols+CH4+H2O systems to reveal the hydroxy group positioning and its effects on hydrate stability. Four clathrate hydrates formed by structural butanol isomers are identified with powder X‐ray diffraction (PXRD). In addition, Raman spectroscopy is used to analyze the guest distributions and inclusion behaviors of large alcohol molecules in these hydrate systems. The existence of a free OH indicates that guest molecules can be captured in the large cages of structure II hydrates without any hydrogen‐bonding interactions between the hydroxy group of the guests and the water‐host framework. However, Raman spectra of the binary (1‐butanol+CH4) hydrate do not show the free OH signal, indicating that there could be possible hydrogen‐bonding interactions between the guests and hosts. We also measure the four‐phase equilibrium conditions of the butanols+CH4+H2O systems. |
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| Keywords: | butanol hydrates phase equilibria Raman spectroscopy X‐ray diffraction |
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