Yan Z, Elliott JA, Masliyah JH
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2G6, Canada
J Colloid Interface Sci. 1999 Dec 15;220(2):329-337. doi: 10.1006/jcis.1999.6533.
An experimental study was conducted to evaluate the effectiveness of the various components of Athabasca bitumen in stabilizing water-in-diluted-bitumen emulsions. The solvent used to dilute the very viscous bitumen was a mixture of 50:50 by volume of hexane and toluene. The various bitumen components studied were asphaltenes, deasphalted bitumen, and fine solids. It was found that asphaltenes and fine solids were the main stabilizers of the water-in-diluted-bitumen emulsions. Individually, the two components can stabilize water-in-diluted-bitumen emulsions. However, when both are present the capacity of the diluted bitumen to stabilize water emulsions is greatest. Emulsion stabilization tests indicated that whole bitumen had less capacity to stabilize water emulsions than asphaltenes and solids. This would indicate that the presence of the small molecules within the whole bitumen tends to lower the emulsion stability. Deasphalted bitumen acts as a poor emulsion stabilizer. Although deasphalted bitumen led to the least emulsion stabilization capacity, interfacial tension measurements showed that diluted deasphalted bitumen gave a greater decrease in the interfacial tension of water with diluent. Copyright 1999 Academic Press.
开展了一项实验研究，以评估阿萨巴斯卡沥青的各种成分在稳定稀释沥青水乳液方面的有效性。用于稀释高粘性沥青的溶剂是按体积比50:50混合的己烷和甲苯。所研究的各种沥青成分包括沥青质、脱沥青油和细固体颗粒。研究发现，沥青质和细固体颗粒是稀释沥青水乳液的主要稳定剂。单独来看，这两种成分都能稳定稀释沥青水乳液。然而，当两者都存在时，稀释沥青稳定水乳液的能力最强。乳液稳定性测试表明，全沥青稳定水乳液的能力比沥青质和固体颗粒弱。这表明全沥青中存在的小分子往往会降低乳液稳定性。脱沥青油作为一种较差的乳液稳定剂。尽管脱沥青油导致的乳液稳定能力最低，但界面张力测量表明，稀释的脱沥青油能使水与稀释剂之间的界面张力有更大程度的降低。版权所有1999年学术出版社。
