Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity
In the oil industry, oil foams can be found at different steps from the crude oil treatment to the gas stations. Their lifetime can sometimes reach several hours and be much longer than the residence times available for gas/liquid separation. However, the conditions of formation and stability of suc...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-12-01
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| Series: | Colloids and Interfaces |
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| Online Access: | http://www.mdpi.com/2504-5377/3/1/2 |
| _version_ | 1819160557315424256 |
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| author | Mélanie Arangalage Jean-Philippe Gingras Nicolas Passade-Boupat François Lequeux Laurence Talini |
| author_facet | Mélanie Arangalage Jean-Philippe Gingras Nicolas Passade-Boupat François Lequeux Laurence Talini |
| author_sort | Mélanie Arangalage |
| collection | DOAJ |
| description | In the oil industry, oil foams can be found at different steps from the crude oil treatment to the gas stations. Their lifetime can sometimes reach several hours and be much longer than the residence times available for gas/liquid separation. However, the conditions of formation and stability of such foams have been poorly studied in the literature, in contrast to the foamability of aqueous systems. On the fields, it is currently observed that crude oils enriched with asphaltenes form particularly stable foams. In this work, we have studied the influence of asphaltenes on the foamability of oil mixtures. All the experiments were performed on model systems of crude oils, that-is-to-say decane/toluene mixtures containing asphaltenes at concentrations ranging from 0.01 to 5 wt%. We in particular demonstrate that, within the investigated concentration range, asphaltenes from two different wells do not have any significant surface active properties despite their contribution to the foamability of oil mixtures. We show that the formation of an asphaltene layer at the interface with air that has been evidenced in the past results from solvent evaporation. Using a recently developed experiment based on the Marangoni effect with our model oils, we demonstrate that asphaltenes are not surface active in those oils. We further characterize the oil foamability by measuring the lifetime of the foam formed by blowing nitrogen through the liquid in a column. At concentrations larger than 1 wt%, asphaltenes significantly enhance the foamability of the oil mixtures. Moreover, the closer the asphaltenes are to their limit of precipitation the larger the foamability. However, we evidence that the oil mixtures themselves foam and we show the importance to consider that effect on the foamability. In addition, we observe that the foamability of the asphaltenes solutions unexpectedly varies with the initial height of the liquid in the column. We suggest that, although not significantly modifying the surface tension, the asphaltenes could be trapped at the oil/gas interface and thus prevent bubble coalescence. |
| first_indexed | 2024-12-22T16:58:20Z |
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| id | doaj.art-f30b33d6b30a4890b295a20c46e1e915 |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-12-22T16:58:20Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-f30b33d6b30a4890b295a20c46e1e9152022-12-21T18:19:23ZengMDPI AGColloids and Interfaces2504-53772018-12-0131210.3390/colloids3010002colloids3010002Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface ActivityMélanie Arangalage0Jean-Philippe Gingras1Nicolas Passade-Boupat2François Lequeux3Laurence Talini4CNRS, Sciences et Ingénierie de la Matière Molle, ESPCI Paris, PSL Research University, Sorbonne Université, 75005 Paris, FranceLaboratoire Physico-Chimie des Interfaces Complexes, ESPCI, 10 rue Vauquelin, 75005 Paris, FranceLaboratoire Physico-Chimie des Interfaces Complexes, ESPCI, 10 rue Vauquelin, 75005 Paris, FranceCNRS, Sciences et Ingénierie de la Matière Molle, ESPCI Paris, PSL Research University, Sorbonne Université, 75005 Paris, FranceCNRS, Sciences et Ingénierie de la Matière Molle, ESPCI Paris, PSL Research University, Sorbonne Université, 75005 Paris, FranceIn the oil industry, oil foams can be found at different steps from the crude oil treatment to the gas stations. Their lifetime can sometimes reach several hours and be much longer than the residence times available for gas/liquid separation. However, the conditions of formation and stability of such foams have been poorly studied in the literature, in contrast to the foamability of aqueous systems. On the fields, it is currently observed that crude oils enriched with asphaltenes form particularly stable foams. In this work, we have studied the influence of asphaltenes on the foamability of oil mixtures. All the experiments were performed on model systems of crude oils, that-is-to-say decane/toluene mixtures containing asphaltenes at concentrations ranging from 0.01 to 5 wt%. We in particular demonstrate that, within the investigated concentration range, asphaltenes from two different wells do not have any significant surface active properties despite their contribution to the foamability of oil mixtures. We show that the formation of an asphaltene layer at the interface with air that has been evidenced in the past results from solvent evaporation. Using a recently developed experiment based on the Marangoni effect with our model oils, we demonstrate that asphaltenes are not surface active in those oils. We further characterize the oil foamability by measuring the lifetime of the foam formed by blowing nitrogen through the liquid in a column. At concentrations larger than 1 wt%, asphaltenes significantly enhance the foamability of the oil mixtures. Moreover, the closer the asphaltenes are to their limit of precipitation the larger the foamability. However, we evidence that the oil mixtures themselves foam and we show the importance to consider that effect on the foamability. In addition, we observe that the foamability of the asphaltenes solutions unexpectedly varies with the initial height of the liquid in the column. We suggest that, although not significantly modifying the surface tension, the asphaltenes could be trapped at the oil/gas interface and thus prevent bubble coalescence.http://www.mdpi.com/2504-5377/3/1/2asphaltenesfoamabilitylayer formationevaporationoil foambubble lifetime |
| spellingShingle | Mélanie Arangalage Jean-Philippe Gingras Nicolas Passade-Boupat François Lequeux Laurence Talini Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity Colloids and Interfaces asphaltenes foamability layer formation evaporation oil foam bubble lifetime |
| title | Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity |
| title_full | Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity |
| title_fullStr | Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity |
| title_full_unstemmed | Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity |
| title_short | Asphaltenes at Oil/Gas Interfaces: Foamability Even with No Significant Surface Activity |
| title_sort | asphaltenes at oil gas interfaces foamability even with no significant surface activity |
| topic | asphaltenes foamability layer formation evaporation oil foam bubble lifetime |
| url | http://www.mdpi.com/2504-5377/3/1/2 |
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