关键词: 大庆原油 , 酸性组分 , 界面 , 扩张流变

Abstract: The acidic components were extracted from Daqing crude oil by using NaOH/EtOH mixed solution. The interfacial tension and dilational rheological properties were investigated at the kerosene-water interface by means of oscillating drop method. The effects of oscillating frequency and bulk mass fraction on interfacial dilational properties were exploited. The results show that the acidic component molecules can easily adsorb onto the interface and greatly reduce interfacial tension. The interfacial dilational behaviors of acidic components are similar to those of surfactants. The modulus increased with increasing frequency and passed through a maximum with bulk concentration increasing, while phase angle increased with decreasing frequency or increasing concentration monotonically. Morover, the modulus maximum of Daqing acidic components is about 45 mN/m, which is much higher than that of Shengli acidic components.

Key words: Daqing crude oil, Acidic components, Interface, Dilational rheology