Middle-phase microemulsion with CO2 responsiveness,Journal of Surfactants and Detergents

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Middle-phase microemulsion with CO2 responsiveness
Journal of Surfactants and Detergents ( IF 1.6 ) Pub Date : 2022-06-11 , DOI: 10.1002/jsde.12607
Dan Guan _{1,

2} , Huoxin Luan _{1,

2} , Hongzhi Shao _{1,

2} , Tingli Que _{1,

2} , Congjun Xu _{1,

2} , Lulu Liu ₃ , Huiyu Huang ₃ , Xiaoling Huang ₃ , Xin Su ₃

Affiliation

Crude oil is the most exploited energy source and the best way to increase the yield of oil recovery is the use of middle-phase microemulsions. But the consecutive formation of water-in-oil emulsions needs oil–water separation. Reversible middle-phase microemulsions were prepared with tetradecane (equivalent alkane for crude oil from Xinjiang oilfields, China) and aqueous solutions containing 1-pentanol, N,N-dimethyltetradecylamine and NaCl, and stimulated with CO₂. By adding and removing CO₂, the conductivity of aqueous solutions without NaCl increases from 20 μS/cm to 3.6 mS/cm reversibly. Additionally, the surface and interfacial tensions of aqueous solution show reversible changes. The middle-phase microemulsion is stable in CO₂ atmosphere. After removing CO₂, it becomes separated into oil and aqueous phases. However, by sparging CO₂ and standing for 2 days, it becomes middle-phase microemulsion again. This research is expected to launch a brand-new avenue for the CO₂-stimulated reversible microemulsification.

更新日期：2022-06-11

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