Stability of water/crude oil emulsions based on interfacial dilatational rheology

被引:186
作者
Dicharry, C
Arla, D
Sinquin, A
Graciaa, A
Bouriat, P
机构
[1] Univ Pau & Pays Adour, UMR 5150, F-64013 Pau, France
[2] Inst Francais Petr, F-92852 Rueil Malmaison, France
关键词
water-in-oil emulsion; emulsion stability; interfacial dilatational rheology; oscillating pendant drop tensiometer; gel; asphaltenes; resins;
D O I
10.1016/j.jcis.2005.10.069
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The dilational viscoelasticity behaviors of water/oil interfaces formed with a crude oil and its distilled fractions diluted in cyclohexane were investigated by means of an oscillating drop tensiometer. The rheological study of the w/o interfaces at different frequencies has shown that the stable w/o emulsions systematically correspond to interfaces which present the rheological characteristics of a 2D gel near its gelation point. The stability of emulsions was found to increase with both the gel strength and the glass transition temperature of the gel. As expected, the indigenous natural surfactants responsible for the formation of the interfacial critical gel have been identified as the heaviest amphiphilic components present in the crude oil, i.e., asphaltenes and resins. Nevertheless, we have shown that such a gel can also form in the absence of asphaltene in the oil phase. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:785 / 791
页数:7
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