Asphaltene Subfractions Responsible for Stabilizing Water-in-Crude Oil Emulsions. Part 1: Interfacial Behaviors
| Autor: | Zhenghe Xu, Fan Yang, Erica Pensini, Tadeusz Dabros, Plamen Tchoukov, Jan Czarnecki, Jacob H. Masliyah |
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| Rok vydání: | 2014 |
| Předmět: |
Chromatography
Chemistry General Chemical Engineering food and beverages Energy Engineering and Power Technology Fraction (chemistry) 02 engineering and technology 021001 nanoscience & nanotechnology Crude oil Toluene chemistry.chemical_compound Fuel Technology Adsorption 020401 chemical engineering Chemical engineering Emulsion 0204 chemical engineering 0210 nano-technology Asphaltene |
| Zdroj: | Energy & Fuels. 28:6897-6904 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | The asphaltene fraction of crude oil is commonly considered to be responsible for the formation of highly undesirable, stable water-in-crude oil emulsions and rag layers. We developed a new procedure for subfractionation of asphaltenes based on their interfacial activity. The most interfacially active asphaltene (IAA) subfraction was extracted as an interfacial material from emulsified water droplets in asphaltene solution. The IAA subfraction represents less than 2 wt % of whole asphaltenes (WA), but its removal had a profound effect on interfacial and thin emulsion film properties. It was found that the IAA subfraction is a main contributor to emulsion stabilization and formation of rigid oil−water interfaces. IAA adsorbed irreversibly at the oil−water interface and formed interfacial layers of low compressibility. Thin emulsion films of toluene stabilized by IAA were thicker and exhibited severe aging effects in contrast to the films stabilized with remaining asphaltene fractions, which were thin and l... |
| Databáze: | OpenAIRE |
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