Thin liquid film technique - application to water-oil-water bitumen emulsion films
Thin liquid film technique - application to water-oil-water bitumen emulsion films
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DOI：
10.1016/s0927-7757(00)00510-0
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发表时间：
2000-11-15
影响因子：
5.2
通讯作者：
Masliyah, J
中科院分区：
文献类型：
--
作者：
Khristov, K;Taylor, SD;Masliyah, J
我们描述了一个适应的薄液膜压力平衡技术（TLF-PBT）的水/稀释沥青/水薄膜的系统研究。最近对油包水乳液的稳定性的研究，特别是在石油工业中发生的那些，没有适当地解决乳液稳定性对在接近的水滴之间形成的薄膜的依赖性。本研究的目的是获得一些深入了解的机制，特别注意的树脂，沥青质，和固体部分的沥青的相对重要性，稳定的乳液。膜寿命和等效厚度的测量表明，膜的行为强烈依赖于用于稀释沥青的溶剂的类型和浓度。甲苯稀释的沥青膜连续排水，直到形成稳定、均匀的灰色膜。庚烷稀释的沥青膜形成黑色膜，覆盖有分散的含有捕获液体的小白色凹痕，除了在庚烷：沥青重量比为10：1-15：1时，其中形成来源不明的细白色斑点的网络。虽然沥青质和树脂馏分单独提供了一个部分稳定的膜，树脂和沥青质的组合产生了非常稳定的膜，这一结果与其他研究人员的乳液研究。(C)2000 Elsevier Science B. V.保留所有权利。
We describe an adaptation of the thin liquid film-pressure balance technique (TLF-PBT) for a systematic study of water/diluted-bitumen/water thin films. Recent research into the stability of water-in-oil emulsions, particularly those occurring in the oil industry, has not properly addressed the dependence of the emulsion stability on the thin films that are formed between approaching water droplets. The objective of this study is to obtain some insight into the mechanisms that stabilize the emulsion with particular attention to the relative importance of the resin, asphaltene, and solids fractions of the bitumen. Measurements of film lifetime and equivalent thickness indicated that the behavior of the film strongly depended on the type and concentration of solvent used to dilute the bitumen. Toluene-diluted-bitumen films drained continuously until a stable, uniform grey film was formed. Heptane-diluted-bitumen films formed black films covered with a scatter of small white dimples containing trapped liquid except at heptane:bitumen weight ratios of 10:1-15:1, where a network of fine white spots of unknown origin was formed. While the asphaltene and resin fractions alone provide a partially stable film, the combination of resin and asphaltene produced extremely stable films, a result that agrees well with emulsion studies by other researchers. (C) 2000 Elsevier Science B.V. All rights reserved.