物理化学学报 >> 2003, Vol. 19 >> Issue (04): 297-301.doi: 10.3866/PKU.WHXB20030403

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不同结构破乳剂油水界面扩张粘弹性研究

王宜阳;张路;孙涛垒;方洪波;赵濉;俞稼镛   

  1. 中国科学院理化技术研究所,北京 100101; 胜利石油管理局勘探设计研究院,东营　257026
  • 收稿日期:2002-07-11 修回日期:2002-09-05 发布日期:2003-04-15
  • 通讯作者: 赵濉 E-mail:yjy@ipc.ac.cn

Influences of Demulsifiers with Different Structures on Dilational Properties of Decane/Water Interface

Wang Yi-Yang;Zhang Lu;Sun Tao-Lei;Fang Hong-Bo;Zhao Sui;Yu Jia-Yong   

  1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing　100101;Prospecting and Designing Research Institute, Shengli Petroleum Administrative Bureau, Dongying　257026
  • Received:2002-07-11 Revised:2002-09-05 Published:2003-04-15
  • Contact: Zhao Sui E-mail:yjy@ipc.ac.cn

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摘要： 研究了支链破乳剂AE121和直链破乳剂SP169在正癸烷-水界面上的扩张粘弹性质,阐述了两种破乳剂扩张模量随扩张频率和破乳剂浓度的变化规律,考察了两种破乳剂对原油活性组分界面扩张性质的影响,测定了两种破乳剂的水溶液与正癸烷的动态界面张力,并与界面扩张流变性质进行了关联.研究结果表明,两种破乳剂的加入均会大大降低原油活性组分界面膜的扩张模量.较低浓度下直链破乳剂SP169由于吸附能力稍强,降低扩张模量效果较好；而一定浓度以上支链破乳剂AE121由于顶替能力较强,具有一定优势.由于破乳剂本身具有一定的扩张模量,在降低界面扩张模量的效果上,破乳剂的用量并非越大越好.

关键词: 破乳剂, 扩张模量, 扩张弹性, 界面张力

Abstract: The dilational viscoelasticity properties of decane-water interface containing two demulsifiers with straight chain SP169 (octadecanol polyoxypropylene-polyoxyethylene ether) and branch chain AE121 (tetraethylenehexamine polyoxypropylene-polyoxyethylene ether)respectively were investigated. The dependence of dilational modulus on dilational frequency and demulsifier concentration was expounded. The influences of two demulsifiers on dilational properties of oil-water interface containing surface-active fraction from crude oil were also studied. The dynamic interfacial tensions between solutions of two demulsifiers and decane were measured and were related to the interfacial dilational rheology properties. The results showed that the two demulsifiers could decrease remarkably the dilational modulus of oil-water interface containing surface-active fraction from crude oil. At low concentration, because of stronger adsorption ability, the effect of decreasing dilational modulus of SP169 was better. But above a certain concentration, AE121 was preferential because of its higher substitution ability. Since the interface film containing demulsifier had a certain dilational modulus itself, the dosage of demulsifier could not be much higher.

Key words: Demulsifier, Dilational modulus, Dilational elasticity, Interfacial tension