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The interfacial tension (IFT) dynamics of crude oil/alkaline water systems have been examined using the spinning drop interfacial tensiometer. Both synthetic and natural crudes were employed in the study; however, it was found that synthetic crudes frequently exhibited behavior quite different from that observed with natural crudes. Two crude oils were fractionated and the interfacial tension behavior of the fractions against alkaline water was investigated. Interfacial tension reduction was related to the presence of carboxylic acid components. The stabilities of the interfacial tension minima with time were related to the water solubility of the surface active species, and the ease of formation of their surface inactive, undissociated acid salts, as well as, the temperature and oil viscosities. The use of the spinning drop interfacial tensiometer in evaluating the IFT behavior of crude oil/alkaline systems was assessed.
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CAMBRIDGE et al. (1989) studied this question.
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