FLOW PROPERTIES OF WEATHERED CRUDE OILS AND THEIR EMULSIONS
作者:
AhmedA. Elgibaly,
IbrahimS. Nashawi,
MahmoudA. Tantawy,
Ali Elkamel,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 20,
issue 3
页码: 857-882
ISSN:0193-2691
年代: 1999
DOI:10.1080/01932699908943824
出版商: Taylor & Francis Group
关键词: weathered oil/water emulsion;rheology;NaOH;oleic acid;stability
数据来源: Taylor
摘要:
The present paper proposes the emulsification of weathered crude oils in water as a competitive and cost effective method for reducing their viscosities. Weathered crude oil samples were collected from major Kuwaiti oil lakes. Emulsion preparation involved using, either a nonionic surfactant or alkali, as well as both alkali and fatty acid. The obtained emulsions were characterized by measuring the droplet size distribution of the dispersed phase using optical microscopy. Emulsion stability was also examined in terms of the system breakdown. The rheological properties were measured using a concentric cylinder rotary rheometer. The emulsion rheological behavior has been studied as a function of composition, temperature, and shear rate. A constitutive model was developed to characterize the pseudoplastic behavior of the crude oil and the emulsion systems. The model fitted well the experimental results with a correlation coefficient higher than 95%. Associated with the pseudoplastic behavior, viscoelastic behavior has been observed with emulsions and some oils at high shear rates.
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