摘要
研究了用超临界萃取分馏法(SFEF)从伊朗重质原油中分离的两个具有不同平均分子量的原油界面活性组分在正癸烷/水界面的扩张粘弹性行为以及温度对体系扩张粘弹性的影响.研究发现平均分子量大的样品能在油水界面形成更为牢固的界面膜.从扩张模量幅度对扩张频率的双对数曲线和扩张模量相角的频率依赖关系可以推断所有实验体系界面膜的主要的弛豫过程不是扩散弛豫,而可能主要是通过吸脱附势垒的弛豫过程.温度对两个样品的扩张粘弹性参数都有强烈的影响.升高温度可以降低膜的强度和粘度,并且改变相角的频率响应.
The dilational viscoelasticity of the interfacial film formed by interfacial active components of crude oil at n decane/water interface was investigated.The interfacial active components was obtained by supercritical fluid extraction and fractionation(SFEF) method from Iranian heavy oil.The properties of the two samples that have different average molecular weights and the influence of temperature on these properties were studied.The results show that the sample of higher average molecular weight has higher dynamic interfacial dilational activity.From the slope of the lg|ε|～lgω curve and the result of phase angle we can infer that the primary relaxation mechanism is not of diffusion control but perhaps of adsorption barrier control.Temperature profoundly influences the dilational viscoelasticity of interfacial films of the two samples.Increasing temperature decreases the amplitude of dilational modulus and viscosity of the film,and alter the frequency response of phase angle of dilational modulus.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2002年第2期161-165,共5页
Acta Physico-Chimica Sinica
基金
国家重点基础研究规划(G1999022505)资助项目~~
关键词
界面扩张粘弹性
界面驰豫
界面活组分
超临界萃取分馏
原油
分离
温度
油水界面膜
Interfacial dilational viscoelasticity, Interfacial relaxation, Surface active component, Supercritical fluid extraction and fractionation, Crude oil
