...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >On the formation and properties of asphaltene nanoaggregates and clusters by DC-conductivity and centrifugation
【24h】

On the formation and properties of asphaltene nanoaggregates and clusters by DC-conductivity and centrifugation

机译：直流电导率和离心法研究沥青质纳米聚集体和团簇的形成和性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The hierarchical nanocolloidal structure of asphaltenes in solvent and even in crude oil has recently been delineated by a variety of techniques. It is highly desirable to compare results for the same samples from various techniques dependent on different physics. Here, the critical nanoaggregate concentration (CNAC) of specific asphaltenes is determined using both DC-conductivity and centrifugation; excellent agreement is found. In addition, the role of the lightest asphaltenes (or heaviest resins) in nanoaggrega-tion is now amenable to direct measurement; inclusion of this weaker binding fraction does not materially impact the CNAC except by a trivial effect of dilution of the aggregating asphaltenes. DC-conductivity shows there is no observable change in CNAC over a moderate temperature range indicating that the enthalpy of formation of the nanoaggregate is zero. A simple analysis reveals that the entropy of nanoaggregate formation is positive, in agreement with previous work. Finally, the critical clustering concentration is observed at higher concentrations, and as always the clusters of nanoaggreates are found to have a small aggregation numbers. As with the CNAC, the heaviest resins do not affect the clustering concentration except by a trivial dilution effect.
机译：最近，已通过多种技术描述了溶剂甚至原油中沥青质的分层纳米胶体结构。非常需要比较来自依赖于不同物理学的各种技术的相同样本的结果。在这里，使用直流电导率和离心法测定特定沥青质的临界纳米聚集体浓度（CNAC）。找到了极好的协议。另外，最轻的沥青质（或最重的树脂）在纳米聚集中的作用现在可以直接测量；除了较弱的聚集沥青质稀释作用之外，包含这种较弱的结合部分不会对CNAC产生实质性影响。直流电导率表明，在中等温度范围内，CNAC没有明显变化，表明纳米聚集体的形成焓为零。一个简单的分析表明，纳米聚集体形成的熵为正，与先前的工作一致。最后，在较高浓度下观察到临界聚集浓度，并且一如既往地发现纳米聚集体的聚集具有小的聚集数。与CNAC一样，最重的树脂不会影响簇集浓度，除非受到微不足道的稀释作用。

著录项

  • 来源
    《Fuel》 |2011年第7期|p.2480-2490|共11页
  • 作者

    Lamia Goual; Mohammad Sedghi; Huang Zeng; Farshid Mostowfi; Richard McFarlane; Oliver C.Mullins;

  • 作者单位

    Dept. of Chemical & Petroleum Eng., University of Wyoming, Laramie, WY 82071, United States;

    Dept. of Chemical & Petroleum Eng., University of Wyoming, Laramie, WY 82071, United States;

    Schlumberger-DBR Technology Center, Edmonton, Canada AB T6N 1M9;

    Schlumberger-DBR Technology Center, Edmonton, Canada AB T6N 1M9;

    Alberta Innovates, Technology Futures, Edmonton, Canada AB T6N 1E4;

    Schlumberger-Doll Research, Cambridge, MA 02139, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    asphaltene; resin; nanoaggregate; cluster; CNAC;

    机译：沥青质树脂纳米聚集体簇;中航;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号