Effects of Polyether Surfactants on Dynamic Interfacial Tension of Betaine Solutions against Crude Oil |
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Authors: | Chong‐Yu Ruan Guo‐Shan Zhang Zhao‐Hui Zhou Qun Zhang Wei‐Xian Situ Lei Zhang Yan Zhu Lu Zhang |
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Affiliation: | 1. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China;2. Development Experiment Center of Xinjiang Oilfield Research Institute of Experiment & Testing, No. 29, Junggar Road, Karamay 834000, China;3. State Key Laboratory of Enhanced Oil Recovery, PetroChina Research Institute of Petroleum Exploration & Development, No. 20, Xue Yuan Road, Beijing 100083, China;4. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | The dynamic interfacial tension (IFT) of betaine and betaine/polyether‐nonionic surfactant‐mixed systems against hydrocarbons, kerosene, and crude oil–water was studied using a spinning‐drop tensiometer. The influence of average molecular weight of polyether‐nonionic surfactants on IFT of mixed solutions was investigated. On the basis of the experimental results, one can find that it is difficult to reach the ultralow IFT value for betaine solution against hydrocarbon and kerosene because of the mismatch between the hydrophobic and hydrophilic groups. After purification, kerosene still contains a small amount of carboxyl groups, which can exert a synergistic effect on surfactants resulting in a lower IFT. The IFT of betaine and mixtures against Daqing crude oil can reach an ultralow value because of the mixed adsorption of surfactant and petroleum soap molecules. For mixed solutions, with the increasing concentration of added polyether, the decrease of petroleum soaps at the oil–water interface results in the destruction of synergistic effects. |
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Keywords: | Betaine Polyether Interfacial tension Daqing crude oil Petroleum soaps |
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