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Experimental study on hydrate anti-agglomeration in the presence of rhamnolipid

机译：rhamnolipid存在下水合物抗聚集的实验研究

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摘要

Gas hydrates might cause a potential safety hazard in subsea flow assurance. Anti-agglomeration is a promising approach to keep subsea oil and gas pipelines free from hydrate risks. Effective anti-agglomerants could prevent hydrate agglomeration of small crystallites by lowering the capillary force between hydrate particles. Biosurfactants are widely known for their eco-friendly nature. In this work, n-octane, water and methane were used as hydrate-forming ingredients to examine the effectiveness of rhamnolipid. Our investigation was carried out at constant high pressure (10 MPa) with different water cuts, subcooling degrees and rhamnolipid mass fractions. Three agglomeration states of hydrate were observed in a high-pressure visual autoclave apparatus. Torque measurements showed that rhamnolipid could effectively prevent hydrate agglomeration with a concentration of 0.5 wt%. In addition, the structural characteristics and morphology of hydrate were observed by use of powder X-ray diffraction, Raman spectroscopy and cryo-scanning electron microscopy. We noticed that the introduction of rhamnolipid had no effect on hydrate structure, but it could increase the large and small cavity ratio value and hydration number. Through the microscopic images, we inferred that rhamnolipid could make the surface of hydrate smooth, which resulted in a more ordered surface.
机译：天然气水合物可能会导致海底流保证潜在的安全隐患。防结块是一种很有前途的方法来保持海底石油和天然气管道从水合物释放的风险。有效的抗附聚剂可以通过降低水合物颗粒之间的毛细管力防止小的微晶的水合物凝聚。生物表面活性剂被广泛称为他们的生态友好的性质。在这项工作中，正辛烷，水和甲烷用作水合物形成成分审查的鼠李糖脂的有效性。我们的调查以恒定的高压（10兆帕），不同的含水量，过冷度与鼠李糖脂的质量分数进行。在高压釜的视觉装置中观察到水合物的三个结块状态。扭矩测量结果表明，鼠李糖脂可以有效防止结块水合物与0.5重量％的浓度。此外，通过使用粉末X射线衍射，喇曼光谱和低温扫描电子显微镜所观察到的结构特点和水合物的形态。我们注意到，引进鼠李糖脂的对水合物结构没有影响，但它可以增加大，小腔比值和水化数。通过显微图像，我们推断，鼠李糖脂可以使水合物的表面光滑，这就造成了一个更有序的表面。

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  • 来源
    《RSC Advances》 |2018年第69期|共9页
  • 作者

    Hou Guodong; Liang Deqing; Li Xiaosen;

  • 作者单位

    Univ Sci &

    Technol China Dept Thermal Sci &

    Energy Engn Hefei 230027 Anhui Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Guangzhou Inst Energy Convers Key Lab Gas Hydrate Guangzhou 510640 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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