原油减压渣油馏分的油-水界面性质Ⅻ.伊朗轻质减渣和大庆减渣乳状液的Zeta电位

OIL-WATER INTERFACIAL PROPERTIES OF VACUUM RESIDUE FRACTIONS FROM CRUDE OIL Ⅻ. The Zeta Potential of Model Emulsion of Vacuum Residua Fractions From Iranian Light and Daqing Crude Oil

采用电泳法研究了伊朗轻质减压渣油和大庆减压渣油模拟乳状液的Zeta电位。研究表明,伊朗轻质减压渣油和大庆减压渣油乳状液的Zeta电位主要由摩擦、吸附和电离产生,并且Zeta电位值随馏分的增重而增加;当水相为纯水时,乳状液的Zeta电位为负值,其绝对值随馏分油相的质量浓度或油相中芳烃含量的增大而增加;随着水相pH的升高,模拟乳状液的Zeta电位由正电性逐渐向负电性转变;随水相中盐的加入,模拟乳状液的Zeta电位绝对值增加,电性不变。

The Zeta potential of model emulsions stabilized by vacuum residua fractions from Iranian light and Daqing crude oil were studied by using electrophoretic method. The results showed that the Zeta potential of the model emulsions originated from friction, adsorption and ionization in the procedure of emulsification, and their absolute values increased with the average molecular mass of the fraction. When water phase was pure water, the Zeta potential of the model emulsions were negative and their absolute values increased with the mass concentration of fraction in oil phase or the aromatics content of oil phase. As the pH value in water phase growing up, the Zeta potential of the model emulsions changed from positive to negative. With addition of salt, the Zeta potential kept in negative charge, but their absolute values increased.