含沥青质模拟油/水乳状液稳定性与界面性质关系Ⅰ界面张力和Zeta电位的影响

Relationship Between the Stability of Asphaltene Model Oil-in-Water Emulsion and Interfacial Properties Ⅰ Study of the Effect of Interfacial Tension and Zeta Potential

采用近红外稳定性分析仪研究了水包沥青质模拟油型乳状液的稳定性。考察了两种表面活性剂十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)、沥青质质量浓度以及盐对乳状液稳定性的影响,探讨了油水界面张力及油珠表面的Zeta电位与乳状液稳定性的关系。结果表明,SDBS稳定的乳状液要比SDS稳定;在所考察的条件范围内,沥青质质量浓度越高,乳状液越不稳定,盐能增强乳状液的稳定性。油水界面张力的降低有利于水包油乳状液的稳定,而Zeta电位不是影响乳状液稳定性的主要因素。

The stability of asphaltene model oil-in-water emulsion was studied using near infrared stability analyzer. The effect of two different surfactants （SDS and SDBS ） and the mass concentration of the asphaltene and the salt on the emulsion stability was investigated. The relationship between the interracial tension and Zeta potential and the emulsion stability was studied. The results show that the emulsion stabilized by SDBS was more stable than SDS;in the investigated range,the higher the mass concentration of the asphaltene was,the less stable the emulsion was,and the salt can enhance the stability of the emulsion. The decrease of the interracial tension was conducive to the stability of the O/W emulsion,while the Zeta potential might not play an important role in keeping the stability of the emulsion.