原油减压渣油馏分的油-水界面性质Ⅸ.大庆减渣馏分油-水界面膜的扩张粘弹性

采用L～B法考察了大庆减渣馏分油-水界面膜的扩张粘弹性，并和伊朗重质减渣馏分油-水界面膜的扩张粘弹性进行了比较。结果表明，由于大庆减渣馏分油-水界面膜中蜡的含量较高，并存在片状结构的相对滑移，各馏分的扩张粘弹性相差不大，且数值范围与伊朗重质减渣中轻馏分的扩张粘弹性范围一致。按片状结构在滑移过程中相互作用由强到弱，馏分扩张粘弹性可分为馏分7、馏分1和15以及馏分3和10三组，三组馏分扩张模量、扩张弹性和扩张粘度均依次减小，相角依次增加。馏分1、3、10、15的界面膜中易发生片状结构的滑移，其扩张粘度基本上不随扩张频率的变化而变化。

OIL-WATER INTERFACIAL PROPERTIES OF VACUUM RESIDUE FRACTIONS FROM CRUDE OIL Ⅸ. Dilational Viscoelasticity of Oil-Water Interfacial Film Formed by Vacuum Residue Fractions From Daqing Crude Oil

Dilatational viscoelasticity of oil water interfacial film formed by vacuum residue fractions from Daqing crude oil was studied by using L B method and the results were discussed and compared with corresponding parameters of Iranian heavy vacuum residue fractions. It is shown that because of the high wax content and sliding between piece structures in the oil water interfacial, the values of dilational viscoelasticity was closed to each other and in the same range film of each Daqing fraction of light fractions in Iranian heavy vacuum residue fractions. Daqing fractions were divided into three groups as the 7 th fraction (DQ7), the 1 st and 15 th fractions (DQ1 and 15), the 3 rd and 10 th fractions (DQ3 and 10), according to the interaction degree between piece structures in process of sliding, and the dilatational modulus elasticity and viscosity of the there groups increased or decrease in the order of the groups mentioned above. The sliding movement between piece structures is easy to take place in DQ1, 3, 10, 15, resulting their dilatational viscosity unchangeable with the dilatational frequency increasing.