原油减压渣油馏分的油-水界面性质Ⅷ.伊朗重质减渣馏分油-水界面膜的扩张粘弹性

采用L-B法考察了伊朗重质减渣馏分油-水界面膜的扩张粘弹性。结果表明，伊朗重质油减渣馏分的扩张粘弹性随馏分的增重以及扩张频率的增大而递变。随着馏分的增重，扩张模量、扩张弹性、扩张粘度增加，相角减小。随着扩张频率的增大，扩张模量、扩张弹性增加，扩张粘度、相角减小。轻馏分界面膜可压缩性好，缓冲作用强，扩张粘弹性参数随扩张频率及馏分的递变幅度小；重馏分界面膜刚性强，扩张粘弹性参数随扩张频率及馏分的递变幅度大。

OIL-WATER INTERFACIAL PROPERTIES OF VACUUM RESIDUE FRACTIONS FROM CRUDE OIL Ⅷ. Dilational Viscoelasticity of Oil-Water Interface Film Formed by Vacuum Residue Fractions From Iranian Heavy Crude Oil

Dilational viscoelasticity of oil-water interface film formed by vacuum residue fractions from Iranian heavy crude oil was studied by using L-B method. Results indicated that the dilational viscoelasticity parameters of vacuum residue fractions from Iranian heavy crude oil changed with the increase of molar mass of fractions or dilational frequency. As the molar mass of fractions increased, the dilational modulus, the dilational elasticity and the dialtional viscosity increased, and the phase angle decreased. As the dilational frequency increased, the dilational modulus, the dilational elasticity increased, and the dialtional viscosity and the phase angle decreased. The interface film formed by light fractions showed buffering characteristics with higher compressibility, and the increase extent of dilational viscoelasticity parameters changed lesser with the increase of molar mass of fractions or dilational frequency. The interface film formed by heavy fractions showed rigidity characteristics with little compressibility, and the increase extent of dilational viscoelasticity parameters changed more with the increase of molar mass of fractions or dilational frequency.