界面扩张流变法研究有机碱与原油活性组分的界面相互作用

Study on Interfacial Interactions between Crude Oil Fractions and Organic Alkali by Interfacial Dilational Rheological Measurements

何冬月

HE Dong-Yue

从胜利油田渤61原油中分离得到胶质和沥青质，通过滴外形分析方法研究了两种原油组分模拟油（质量分数0.5%，由航空煤油配制）与乙醇胺溶液间的界面张力及界面扩张流变性质。结果表明，乙醇胺与胶质中脂肪酸反应，形成脂肪酸和皂的混合吸附膜，有利于界面张力的降低，但对界面扩张模量影响不大。乙醇胺与沥青质中芳香酸的反应能促进芳香酸的吸附，降低界面张力，同时增加膜强度；但随着乙醇胺浓度的进一步增大，芳香酸皂扩散交换作用对界面膜的影响增强，界面膜黏性部分增加，膜强度有所降低。

The two crude oil components, resins and asphaltenes, were separated from shengli Bo61 crude oil, and the interfacial tension and dilational rheological properties between two crude oil components and ethanolamine solutions were investigated at the kerosene-water interface by means of oscillating drop method. The experimental results showed that the mixed adsorption film of the fatty acid and its soap was?formed by reaction?between the fatty acid in resins and ethanolamine, which?was?beneficial to reduce the interfacial tension and ?had little effect on the interfacial dilational modulus. The reaction between asphaltenes and ethanolamine promoted the adsorption of aromatic acid, which resulted in decreasing interfacial tension and increasing film strength. However, the viscosity of interfacial film increased and film strength decreased with the further increase of ethanolamine concentration due to the enhancement of the diffusion-exchange process of aromatic soap between the interfacial film and the bulk.