Measurements of methane hydrate equilibrium in systems inhibited with NaCl and methanol
| Autor: | Carolyn A. Koh, E. Dendy Sloan, Amadeu K. Sum, Kyle A. Olcott, Patrick G. Lafond |
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| Rok vydání: | 2012 |
| Předmět: |
Chemistry
business.industry Thermodynamic equilibrium Clathrate hydrate Thermodynamics Atomic and Molecular Physics and Optics Methane chemistry.chemical_compound Differential scanning calorimetry Natural gas General Materials Science Methanol Physical and Theoretical Chemistry Hydrate business Mass fraction |
| Zdroj: | The Journal of Chemical Thermodynamics. 48:1-6 |
| ISSN: | 0021-9614 |
| DOI: | 10.1016/j.jct.2011.12.023 |
| Popis: | Natural gas hydrates are ice-like inclusion compounds that form at high pressures and low temperatures in the presence of water and light hydrocarbons. Hydrate formation conditions are favorable in gas and oil pipelines, and their formation threatens gas and oil production. Thermodynamic hydrate inhibitors (THIs) are chemicals ( e.g., methanol, monoethylene glycol) deployed in gas pipelines to depress the equilibrium temperature required for hydrate formation. This work presents a novel application of a stepwise differential scanning calorimeter (DSC) measurement to accurately determine the methane hydrate phase boundary in the presence of THIs. The scheme is first validated on a model (ice + salt water) system, and then generalized to measure hydrate equilibrium temperatures for pure systems and 0.035 mass fraction NaCl solutions diluted to 0, 0.05, 0.10, and 0.20 mass fraction methanol. The hydrate equilibrium temperatures are measured at methane pressures from (7.0 to 20.0) MPa. The measured equilibrium temperatures are compared to values computed by the predictive hydrate equilibrium tool CSMGem. |
| Databáze: | OpenAIRE |
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