Thermodynamic and spectroscopic identification of aldehyde hydrates

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-It has been reported that some aldehyde compounds have formed simple sII clathrate hydrates without help-gas molecules, showing a self-forming effect. However, the structure of aldehyde hydrates is quite unstable due to the "gem-diol reaction". According to the previous studies, the aldehyde hydrate slowly decomposes at atmospheric condition with the conversion of aldehyde to gem-diol. We investigated binary aldehyde (acetaldehyde, propionaldehyde, and isobutyraldehyde)+methane clathrate hydrate with spectroscopic and thermodynamic analyses. Similar to the simple aldehyde hydrate, the binary hydrates also formed a sII hydrate. During the hydrate formation process, we found that most of the aldehydes converted to gem-diols and were then incorporated into the large cages of the sII hydrate. Depending on the equilibrium constant of the gem-diol reaction caused by the molecular structures of the three aldehydes, different phase equilibrium curves of aldehyde+methane hydrates were obtained
Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
Issue Date
2016-06
Language
English
Article Type
Article
Keywords

CLATHRATE HYDRATE; EQUILIBRIUM CONDITIONS; DIELECTRIC EVIDENCE; ACETONE HYDRATE; BINARY-SYSTEM; ACETALDEHYDE; PRESSURE; METHANE

Citation

KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.33, no.6, pp.1897 - 1902

ISSN
0256-1115
DOI
10.1007/s11814-016-0028-3
URI
http://hdl.handle.net/10203/210165
Appears in Collection
CBE-Journal Papers(저널논문)
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