| Autor: |
Cai, Wenjiu, Huang, Xin, Lu, Hailong, Zhan, Linsen, Dai, Feng, Zhang, Cong |
| Zdroj: |
Industrial & Engineering Chemistry Research; August 2024, Vol. 63 Issue: 34 p15083-15089, 7p |
| Abstrakt: |
In natural gas hydrates, heavy hydrocarbon gases are detected, although methane is the primary component. The properties of mixed gas hydrates containing heavy hydrocarbon gases are crucial for gas storage and transportation, and it is also important to study the mechanism of hydrate accumulation. Intensive studies have been carried out to study the thermodynamic properties and structures of mixed gas hydrates, but further investigations are still necessary on the cage occupancies of guest molecules. Mixed gas hydrates are formed by exposing ice powders to mixed methane–propane gases with propane concentrations ranging from 0.24 to 5 mol % at pressures ranging from 4–13 MPa and temperatures of −15–8 °C in 0.5–7 days. The structure of a mixed methane–propane hydrate is specified by X-ray diffraction, and the cage occupancies are estimated with their Raman spectra. The results obtained show that the cage occupancies of methane in small cages are in the range 0.8–0.9, and the cage occupancies of methane in the large cages exhibit an inverse correlation with that of propane. Higher propane concentration, lower temperature, higher pressure, and sufficient reaction time all contribute to the higher cage occupancies of propane in large cages. |
| Databáze: |
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