Journal
MOLECULES
Volume 26, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/molecules26206273
Keywords
CO2-switchable oligomeric surfactants; pseudo-tetrameric surfactants; viscosity reduction; demulsification
Funding
- State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development [GSYKY-B09-33]
- Fundamental Research Funds for the Central Universities [YJ201831]
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This study prepared a CO2-switchable pseudo-tetrameric surfactant by simple mixing, which can reduce the viscosity of heavy oil and exhibit good stability and demulsification properties.
CO2-switchable oligomeric surfactants have good viscosity-reducing properties; however, the complex synthesis of surfactants limits their application. In this study, a CO2-switchable pseudo -tetrameric surfactant oleic acid (OA)/cyclic polyamine (cyclen) was prepared by simple mixing and subsequently used to reduce the viscosity of heavy oil. The surface activity of OA/cyclen was explored by a surface tensiometer and a potential for viscosity reduction was revealed. The CO2 switchability of OA/cyclen was investigated by alternately introducing CO2 and N-2, and OA/cyclen was confirmed to exhibit a reversible CO2-switching performance. The emulsification and viscosity reduction analyses elucidated that a molar ratio of OA/cyclen of 4:1 formed the pseudo -tetrameric surfactants, and the emulsions of water and heavy oil with OA/cyclen have good stability and low viscosity and can be destabilized quickly by introducing CO2. The findings reported in this study reveal that it is feasible to prepare CO2-switchable pseudo-tetrameric surfactants with viscosity-reducing properties by simple mixing, thus providing a pathway for the emulsification and demulsification of heavy oil by using the CO2-switchable pseudo -oligomeric surfactants.
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