Phase Equilibrium and Dissociation Enthalpies of Trimethylene Sulfide plus Methane Hydrates in Brine Water Systems
In this work, we measured the phase equilibrium data of trimethylene sulfide + methane hydrates in brine water systems with a NaCl mass fraction of 0.035, 0.070, 0.100, and 0.120 by using T-cycle methods. The dissociation enthalpies of trimethylene sulfidemethane hydrates were calculated by the Clau...
| Published in: | Journal of Chemical & Engineering Data |
|---|---|
| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2014
|
| Subjects: | |
| Online Access: | http://ir.giec.ac.cn/handle/344007/10623 https://doi.org/10.1021/je500607n |
| Summary: | In this work, we measured the phase equilibrium data of trimethylene sulfide + methane hydrates in brine water systems with a NaCl mass fraction of 0.035, 0.070, 0.100, and 0.120 by using T-cycle methods. The dissociation enthalpies of trimethylene sulfidemethane hydrates were calculated by the ClausiusClapeyron equation based on the measured phase equilibrium data. The equilibrium pressure of trimethylene sulfide + methane hydrate is much lower than that of the cyclopentane + methane hydrate at the same NaCl concentration in the aqueous solution. Hence, trimethylene sulfide may be a promising water-insoluble chemical promoter. The phase equilibrium pressure of trimethylene sulfide + methane hydrate increases as the temperature rises at the same NaCl concentration. In addition, the concentration of NaCl has more remarkable influence on the equilibrium pressure at a higher temperature. The formation/dissociation enthalpies of trimethylene sulfide + methane hydrate decrease with the increases of the temperature and NaCl concentration, respectively. |
|---|