Abstract

ABSTRACT A demulsifier to be effective in breaking a water-in-oil emulsion has to possess higher polarity than that of the crude oil natural surfactants. In spite of the polarity of those natural surfactants has never been measured, this general rule guided the use of chemicals in oil treatment along the years of the petroleum industry. Previous work developed a method to measure oil polarity, which proved that crude oils differ widely in their polarities. Present work extends this method to evaluate the polarity of several commercially available chemicals for crude oil demulsification. Because asphaltenes are considered to play a decisive role in emulsion stability, their polarity was also determined. The results provided an overall comprehension about the polarities involved in crude oil demulsification.

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