物理化学学报 >> 2004, Vol. 20 >> Issue (02): 194-198.doi: 10.3866/PKU.WHXB20040218

研究简报 上一篇    下一篇

破乳剂对油水界面膜作用机理研究

康万利;张红艳;李道山;吴肇亮;李明远;高慧梅   

  1. 大庆石油学院石油工程学院,大庆 163318;石油大学化工学院,北京 102249
  • 收稿日期:2003-06-02 修回日期:2003-08-29 发布日期:2004-02-15
  • 通讯作者: 康万利 E-mail:Kangwanli@163.net

The Action Mechanism of Demulsifiers at Model O/W Interfacial Film

Kang Wan-Li;Zhang Hong-Yan;Li Dao-Shan;Wu Zhao-Liang;Li Ming-Yuan;Gao Hui-Mei   

  1. School of Petroleum Engineering, Daqing Petroleum Institute, Daqing 163318; School of Chemical Engineering, University of Petroleum, Beijing 102249
  • Received:2003-06-02 Revised:2003-08-29 Published:2004-02-15
  • Contact: Kang Wan-Li E-mail:Kangwanli@163.net

摘要: 研究了破乳剂存在下油膜寿命、油膜薄化速率以及油水界面性质与破乳效果的关系.结果表明,破乳剂使油水界面弹性降低,导致油水界面强度减弱,界面膜寿命变短,界面膜厚度变薄.当膜厚度变薄到一临界值时,膜破裂,导致破乳脱水.同种破乳剂,随着其浓度的增加,界面弹性降低.当浓度超过某一值时,界面弹性值基本不变.不同种破乳剂,界面弹性降低幅度越大,其破乳效果越好.界面弹性值可以很好解释破乳剂的脱水率变化规律.

关键词: 破乳剂, 油膜寿命, 油膜薄化速率, 界面张力, 界面粘度, 界面弹性

Abstract: Oil film life, rate of oil film thinning, water-oil interfacial properties and their effects on demulsification of model petroleum emulsions(O/W) in the presence of demulsifiers are studied. The results indicate that the interfacial elasticity decreased with the addition of demulsifiers, resulting a decrease of both the strength and the thickness of the oil film, and hence leading to a shorter film life. The film will break down when the film thickness reaches to a critical value by film thinning .For the demulsifiers in the same series, the interfacial elasticity of the film lowered with increasing demulsifier concentration initially, and then kept constant after the concentration reached a definite value. For the demulsifiers in different series, the more the interfacial elasticity lowered, the better the dewatering effect will be. The dewatering rate is correlated with the interfacial elasticity. An action mechanism of the demulsifiers was proposed according to the experimental results.

Key words: Demulsifiers, Oil membrane life, Rate of oil film thinning,  Interfacial tension, Interfacial viscosity, Interfacial elasticity