Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 146-153.doi: 10.3866/PKU.WHXB201228146

• SOFT MATTER • Previous Articles     Next Articles

Application of Anion-Cation Pair Surfactant Systems to Achieve Ultra-Low Oil-Water Interfacial Tension

HAN Xia2, CHENG Xin-Hao1, WANG Jiang, HUANG Jian-Bin1   

  1. 1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
    2. Shengli Engineering & Consulting Co., Ltd., Dongying 257026, Shandong Province, P. R. China
  • Received:2011-08-26 Revised:2011-11-02 Published:2011-12-29
  • Contact: Huang Jian-Bin
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873001, 50821061, 21073006), and National Key Basic Research Program of China (973) (2007CB936201).

Abstract: In this paper, ultra-low interfacial tension was obtained in realistic oil-water systems using ion pair surfactant systems. To improve the solubility of the ion pair surfactants, polyoxyethylene chain was introduced into the anionic surfactant molecular structure, and a three-component strategy where ion pair surfactants were combined with a non-ionic surfactant was used. Furthermore, the effects of the structures of the cationic and non-ionic surfactants, distribution ratio of the three components, and surfactant concentration on oil-water interfacial tension were studied. We successfully achieved the ultra-low interfacial tension in the Shengli oil fields using the mixed systems combining ion pairs and non-ionic agents. Several systems possessed an interfacial tension as low as 10-4 mN·m-1. Because of the strong electrostatic attraction between surfactant ions, our systems possess ultra-low interfacial tension after adsorption. The results show that after 48 h quartz adsorption, the systems can still reduce the interfacial tension to an ultra-low level.

Key words: Anion-cation pair surfactants, Surfactants mixed system, Ultra-low interfacial tension, Enhanced oil recovery, Oil recovery


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