Influence of Demulsifiers of Different Structures on Interfacial Dilational Properties of an Oil–Water Interface Containing Surface-Active Fractions from Crude Oil
✍ Scribed by Taolei Sun; Lu Zhang; Yiyang Wang; Sui Zhao; Bo Peng; Mingyuan Li; Jiayong Yu
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 142 KB
- Volume
- 255
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
The influences of two commercial demulsifiers that have a straight chain and branch chain, respectively, on the dilational viscoelasticity of an oil-water interfacial film containing surface-active fractions from crude oil were investigated. The branch-chain demulsifier AE-121 could efficiently substitute surface-active fractions of different average molecular weights from the oil-water interface, while straight-chain SP-169 could only efficiently substitute those of large average molecular weight. It was apt to form a mix-adsorption layer with surface-active fractions of small average molecular weight. The results showed that the molecular size (or represented by average molecular weights) of the surface-active fractions was an important factor influencing the reciprocity of demulsifiers and surface-active fractions at the oil-water interface. This effect could be well explained by the difference between sizes of surface-active fraction molecules and vacancies between demulsifier molecules at the interface. The results of SDBS also proved this explanation.