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Influence of asphaltene on wax deposition: Deposition inhibition and sloughing

机译:沥青质对蜡沉积的影响:沉积抑制和脱落

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摘要

Asphaltenes are the heaviest and most polar constituents of crude oils. The influences of asphaltene on wax deposition were investigated with model oils utilizing a Taylor-Couette device. The composition and rheological properties of the deposits and the chemical properties of the asphaltenes entrained in the deposits were analyzed. Three main observations were obtained: (a) Wax deposition rate decreases in the presence of asphaltenes while the wax content of the deposit increases. The carbon number distribution of the deposit and the critical carbon number of the deposition process were also observed to vary due to the presence of asphaltenes. (b) The asphaltene content of the deposit constantly increases as time elapses and eventually reaches several times higher than that of the original oil. The asphaltenes entrained in the deposits are of higher polarity and molecular weight than the asphaltenes originally present in the oil. (c) When the asphaltene content of the oil is above 0.2 wt%, deposits slough off frequently as asphaltenes alter the microstructure of the deposit and lower its yield strength.
机译:沥青质是原油中最重和最极性的成分。使用泰勒-库埃特装置,使用模型油研究了沥青质对蜡沉积的影响。分析了沉积物的组成和流变性质以及夹带在其中的沥青质的化学性质。获得了三个主要观察结果:(a)在沥青质存在下蜡沉积速率降低,而沉积物中蜡含量增加。还观察到沉积物的碳数分布和沉积过程的临界碳数由于沥青质的存在而变化。 (b)随着时间的流逝,沉积物中的沥青质含量不断增加,最终达到原始油含量的几倍。与最初存在于油中的沥青质相比,沉积物中夹带的沥青质具有更高的极性和分子量。 (c)当油中的沥青质含量超过0.2重量%时,由于沥青质改变了沉积物的微观结构并降低了其屈服强度,因此沉积物经常脱落。

著录项

  • 来源
    《Fuel》 |2020年第15期|117047.1-117047.8|共8页
  • 作者

  • 作者单位

    China Univ Petr Beijing Key Lab Urban Oil & Gas Distribut Technol Natl Engn Lab Pipeline Safety MOE Key Lab Petr Engn Beijing 102249 Peoples R China;

  • 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

    Wax deposition; Asphaltenes; Aging; Asphalene enrichment; Deposit sloughing;

    机译:蜡沉积;沥青质老化;沥青质的富集;沉积物脱落;

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