Effect of Aqueous Phase pH on the Dynamic Interfacial Tension of Acidic Crude Oils and Myristic Acid in Dodecane

肉豆蔻酸 水溶液 表面张力 十二烷 化学 双水相体系 化学工程 吸附 肺表面活性物质 核化学 有机化学 脂肪酸 热力学 棕榈酸 工程类 物理 生物化学
作者
Serkan Keleşoğlu,Paul Meakin,Johan Sjöblom
出处
期刊:Journal of Dispersion Science and Technology [Taylor & Francis]
卷期号:32 (11): 1682-1691 被引量:25
标识
DOI:10.1080/01932691.2010.516416
摘要

AbstractThe time dependence of the interfacial tension between water–acidic crude oil and water–synthetic oil was investigated for aqueous phase pHs ranging from 2 to 9 using the du Noüy ring method at 20°C. Myristic acid in dodecane was selected as a model (synthetic oil) for acidic crude oil containing indigenous surfactants, and the similarities and differences between the dynamic interfacial tension behaviours of the natural and synthetic crude oil systems were compared. The initial interfacial tension and the relaxation of the interfacial tension are sensitive to the aqueous phase pH for both systems. The adsorption kinetics of the indigenous surfactants and myristic acid could be well fitted with the monoexponential model, and the time constants obtained in this manner indicates that reorganization of the indigenous surfactants and myristic acid at the w/o interface are pH dependent. The experimental results also indicate that indigenous surfactants in acidic crude oil and myristic acid in dodecane have similar film formation behaviours at the w/o interface for the range of pHs investigated.Keywords: Acidic crude oildynamic interfacial tensionindigenous surfactantsmyristic acidsynthetic oil AcknowledgementsS. K. acknowledges a Ph.D. grant and financial support from the Multiphase Flow Assurance Centre (FACE), a research cooperation between IFE, NTNU, and SINTEF. The center is funded by The Research Council of Norway, and by the following industrial partners: Statoil AS, Norske ConocoPhillips AS, Vetco Gray Scandinavia AS, Scandpower Petroleum Technology AS, FMC, CD–adapco, ENI Norge AS, Shell Technology Norway AS. The authors also acknowledge discussions with and comments by Dr. Brian Grimes on a first draft of the manuscript.Notes a Karl-Fischer titration. b AP PAAR DMA 500 density meter.
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