Crystal Growth of Ionic Semiclathrate Hydrate Formed in CO2 Gas + Tetrabutylammonium Bromide Aqueous Solution System
| Autor: | Shunsuke Koyanagi, Ryo Ohmura |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Crystal Growth & Design. 13:2087-2093 |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | This article reports the visual observations of the formation and growth of ionic semiclathrate hydrate crystals in the system of aqueous solution of tetrabutylammnonium bromide (TBAB) and CO2 gas. The experimental thermodynamic conditions are (i) the temperature from 286 to 290 K for wTBAB = 0.40 and (ii) 282 to 288 K at wTBAB = 0.10, under the common pressure of 2.3 or 3.4 MPa, where wTBAB denotes the mass fraction of TBAB in the aqueous solution. The lower limit of the temperature was set to avoid the formation of simple TBAB hydrate containing no CO2. The hydrate crystals first formed in the bulk of the aqueous liquid as well as at the gas/liquid interface. The former crystals settled downward and the latter grew to form a hydrate film covering the interface. Both of the hydrate crystals then grew into the aqueous liquid. The morphology of hydrate crystals grown in the aqueous liquid varied distinctly depending on the system subcooling ΔTsub. ΔTsub ≡ Teq – Tex, where Teq is the equilibrium temperature... |
| Databáze: | OpenAIRE |
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