油酸钠和失水山梨醇油酸酯的油-水界面扩张粘弹性比较  

COMPARISION OF DILATIONAL VISCOELASTIC PROPERTIES OF SODIUM OLEATE WITH SORBITAN MONOOLEATE AT OIL-WATER INTERFACE

作　　者：王宜阳[1] 张路[1] 李明远[2] 赵濉[1] 俞稼镛[1] 

机构地区：[1]中国科学院理化技术研究所,北京100101 [2]石油大学,北京102200

出　　处：《石油学报（石油加工）》2004年第5期87-93,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：973国家重点基础研究规划资助项目(G19990225)

摘　　要：研究了油溶性乳化剂失水山梨醇油酸酯和水溶性乳化剂油酸钠在煤油 水界面上的扩张粘弹性质,阐述了两种乳化剂的扩张模量、扩张弹性、扩张模量的相角以及扩张模量的粘性部分随频率和乳化剂质量分数的变化规律,探讨了发生在界面上和界面附近的微观弛豫过程。结果表明,在频率为0.0033～0.1Hz的范围内,失水山梨醇油酸酯的扩张模量、扩张弹性、扩张模量的相角以及粘性部分均随其质量分数的增大而明显减小。油酸钠在高频(>0.033Hz)条件下的界面扩张模量和扩张弹性几乎不随其质量分数的增大而变化;在低频(<0.033Hz)条件下,油酸钠的扩张模量和扩张弹性随其质量分数增大的变化趋势较为复杂。失水山梨醇油酸酯和油酸钠在界面上截然不同的扩张行为可能与发生在界面上和界面附近的弛豫过程特征不同有关。The dilational viscoelastic properties at kerosen-water interface containing two different emulsifiers of sorbitan monooleate and sodium oleate respectively were investigated. The dependencies of dilational modulus, dilational elasticity, phase angle and dilational viscous component on frequency and emulsifier mass fraction were expounded. The microcosmic relaxation processes existed at and near the interface were studied. Experiments showed that the dilational modulus, dilational elasticity, phase angle and dilational viscous component for sorbitan monooleate decreased obviously with the increase of emulsifier mass percent within frequencies of 0.0033-0.1Hz. However, at high frequencies (>0.033Hz), the dilational modulus and elasticity changed little with increased mass percent of sodium oleate; at low frequencies (<0.033Hz), the influence of the mass percent of sodium oleate on the dilational modulus and elasticity was very complicated. The interfacial tension relaxation experiment stated that different dilational properties for two emulsifiers may be connected with their different relaxation processes existed at and near the interface.

关 键 词：油酸钠 山梨醇油酸酯 乳化剂 扩张弹性 相角 扩张行为 

分 类 号：TE624[石油与天然气工程—油气加工工程] O647[理学—物理化学]