| 초록 |
In this study, we focused on the large molecular alcohols, which have not been discussed in detail, as inhibitors of gas hydrate formation. Gas hydrates were synthesized with pinacolyl alcohol (3,3-dimethyl-2-butanol) and tert-amyl alcohol (2-methyl-2-butanol) as large guest molecules, in the presence of two kinds of gases (CH4 and CO2) as small guest molecules. From phase-equilibrium curves, pinacolyl alcohol showed a great promoting effect in forming hydrate with CH4, but no effect with CO2. Tert-amyl alcohol showed a slight promoting effect in the low-pressure region and an outstanding inhibiting effect in the high-pressure region with CH4, whereas it showed an inhibiting effect with CO2. Through microscopic analyses using NMR and Raman spectroscopy, structures of each hydrate were confirmed. Both of pinacolyl alcohol and tert-amyl alcohol with CH4 formed sH gas hydrates. On the other hand, with CO2, sI gas hydrates were detected from both hydrates. Even though these alcohols do not affect the structure of gas hydrates with CO2, it is meaningful to find out that they change the structure of CH4 hydrate from sI to sH. |
