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首页> 外文期刊>Colloids and Interfaces >Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces
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Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

机译：短链正构醇对沥青在甲苯/空气和甲苯/水界面的性质的影响

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Crude oil asphaltenes contain a wide series of chemical species, which includes the most polar compounds and interfacially active agents from the petroleum. Asphaltenes have been considered to be implicated in foam and emulsion formation during the petroleum recovery and production process. In this work, the interfacial activity of organic solutions containing asphaltene and n-alcohols was investigated. Asphaltene extraction from a 28?°API crude oil produced 2.5 wt % of n-pentane precipitated asphaltene (C5I). Dynamic surface and interfacial tensions of asphaltene solutions were assessed by the pendant drop method. Asphaltene films were evaluated at the air-water interface using a Langmuir trough. Results were expressed by means of the interfacial tension time-dependence. Interfacial tension measurements showed alcohols reduce the toluene/water interfacial tension of asphaltene solutions. The interfacial tension was reduced from 23 mN/m to 15.5 mN/m for a 2 g/L solution of asphaltene plus n-butanol. Higher asphaltene concentrations did not affect the toluene/air surface tension. The effects of n-alcohols on the asphaltene surface activity was dependent on the asphaltene aggregation state. n-Alcohols modify the asphaltene film elasticity and the film phase behavior.
机译：原油沥青质包含多种化学物质，其中包括极性最大的化合物和石油中的界面活性剂。在石油开采和生产过程中，沥青质被认为与泡沫和乳液的形成有关。在这项工作中，研究了含有沥青质和正醇的有机溶液的界面活性。从28℃API原油中提取沥青质可得到2.5重量％的正戊烷沉淀沥青质（C5I）。通过悬滴法评估沥青质溶液的动态表面和界面张力。使用Langmuir槽在空气-水界面处评估沥青膜。结果通过界面张力时间依赖性表示。界面张力测量表明，醇降低了沥青质溶液的甲苯/水界面张力。对于2 g / L的沥青质加正丁醇溶液，界面张力从23 mN / m降低到15.5 mN / m。较高的沥青质浓度不会影响甲苯/空气表面张力。正醇对沥青质表面活性的影响取决于沥青质的聚集状态。正醇会改变沥青质薄膜的弹性和薄膜的相行为。

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