An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage
Slurries of gas hydrates, especially mixed hydrates of CO2 and TBPB (Tetra-n-Butyl Phosphonium Bromide), are currently under consideration for secondary refrigeration. Secondary refrigeration circuits contain wide sections where the two-phase slurry (solid + liquid), separated from the gas phase, un...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | Science and Technology for Energy Transition |
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| Online Access: | https://www.stet-review.org/articles/stet/full_html/2023/01/stet20220168/stet20220168.html |
| _version_ | 1827768427183341568 |
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| author | Pons Michel |
| author_facet | Pons Michel |
| author_sort | Pons Michel |
| collection | DOAJ |
| description | Slurries of gas hydrates, especially mixed hydrates of CO2 and TBPB (Tetra-n-Butyl Phosphonium Bromide), are currently under consideration for secondary refrigeration. Secondary refrigeration circuits contain wide sections where the two-phase slurry (solid + liquid), separated from the gas phase, undergoes transformations that would if gas were present, lead to both hydrate formation and gas dissolution. The absence of gas hinders these processes: the slurry is in gas shortage. The analysis demonstrates that, although thermodynamically distant from three-phase equilibria, slurries in gas-shortage are in equilibrium. For describing their thermodynamic state, the notion of CO2 partial pressure in a gas mixture is introduced, which leads to an equation of state and a new phase diagram with temperature or enthalpy versus CO2 mass-fraction. This diagram complements those commonly used for three-phase systems. The thermal behavior of slurries in gas shortage is then investigated, leading to the possibility of future experimental validation of the present analysis. |
| first_indexed | 2024-03-11T12:12:58Z |
| format | Article |
| id | doaj.art-ad72ad4aeb0948299ce0fd34eadfc7fa |
| institution | Directory Open Access Journal |
| issn | 2804-7699 |
| language | English |
| last_indexed | 2024-03-11T12:12:58Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Science and Technology for Energy Transition |
| spelling | doaj.art-ad72ad4aeb0948299ce0fd34eadfc7fa2023-11-07T10:43:13ZengEDP SciencesScience and Technology for Energy Transition2804-76992023-01-01782910.2516/stet/2023027stet20220168An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortagePons Michel0Université Paris-Saclay, CNRS, Laboratoire Interdisciplinaire des Sciences du NumériqueSlurries of gas hydrates, especially mixed hydrates of CO2 and TBPB (Tetra-n-Butyl Phosphonium Bromide), are currently under consideration for secondary refrigeration. Secondary refrigeration circuits contain wide sections where the two-phase slurry (solid + liquid), separated from the gas phase, undergoes transformations that would if gas were present, lead to both hydrate formation and gas dissolution. The absence of gas hinders these processes: the slurry is in gas shortage. The analysis demonstrates that, although thermodynamically distant from three-phase equilibria, slurries in gas-shortage are in equilibrium. For describing their thermodynamic state, the notion of CO2 partial pressure in a gas mixture is introduced, which leads to an equation of state and a new phase diagram with temperature or enthalpy versus CO2 mass-fraction. This diagram complements those commonly used for three-phase systems. The thermal behavior of slurries in gas shortage is then investigated, leading to the possibility of future experimental validation of the present analysis.https://www.stet-review.org/articles/stet/full_html/2023/01/stet20220168/stet20220168.htmlgas-hydratemixed-hydratesecondary refrigerationco2tbpbthermodynamics |
| spellingShingle | Pons Michel An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage Science and Technology for Energy Transition gas-hydrate mixed-hydrate secondary refrigeration co2 tbpb thermodynamics |
| title | An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage |
| title_full | An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage |
| title_fullStr | An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage |
| title_full_unstemmed | An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage |
| title_short | An equation of state and a phase diagram for gas-hydrate-forming slurries in gas-shortage |
| title_sort | equation of state and a phase diagram for gas hydrate forming slurries in gas shortage |
| topic | gas-hydrate mixed-hydrate secondary refrigeration co2 tbpb thermodynamics |
| url | https://www.stet-review.org/articles/stet/full_html/2023/01/stet20220168/stet20220168.html |
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