Sandwich structures at oil-water interfaces under alkaline conditions

被引:52
|
作者
Horváth-Szabó, G [1 ]
Czarnecki, J
Masliyah, JH
机构
[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada
[2] Syncrude Canada Ltd, Edmonton Res Ctr, Edmonton, AB T6N 1H4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
crude oil; bitumen; flooding models; naphthenic acids-; naphthenates; liquid crystal; emulsion stability; interface elasticity; polarization microscopy; enhanced oil recovery;
D O I
10.1006/jcis.2002.8524
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
Equilibrium liquid crystal (LC) layer on an interface between crude oils and water was observed at high pH. This layer is composed mainly of sodium naphthenates produced in situ at the water/oil interface. Transient LC layer was also evolved at the interface of aqueous phase of sodium hydroxide solutions and oleic phase of naphthenic acid (NA) solutions as result of a chemical reaction between NaOH and NA. This chemical reaction causes transport process resulting in a disturbance of the interface. Optical observation of this interface disturbance reviled that the interface covered with LC shows considerably lower flexibility as compared to LC free interface. The LC layer eventually dissolves in the water phase at low oil-to-water ratio, while at high oil-to-water ratio it can form an equilibrium phase, which spreads spontaneously at the oil-water interface. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:427 / 434
页数:8
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