Abstract
The Shengli crude oil fractions of saturates, aromatics, resins, and asphaltenes (SARA) were obtained by the classic SARA method, and acidic fractions were extracted by ethanol/water (7:3, v/v) solution mixed with 1.5 mass % NaOH. The interfacial tensions (IFTs) of solutions of two different betaines with different structures against n-alkanes, kerosene, and crude oil fractions dissolved in kerosene were studied in this paper. The experimental results show that, for linear betaine, a small quantity of crude oil fractions, especially acidic fractions and resins, can decrease IFTs of the system by forming a mixed adsorption film, which enhances the dynamic behavior and the compactness of interfacial films to some degree. Therefore, it has a synergistic effect between crude oil fractions and linear betaine. However, for the branched betaine with a larger hydrophobic part, it displays the absolutely opposite tendency because a small amount of active substances present in kerosene can have a synergistic effect...
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