Oil Deposits in Highly Paraffinic Crude Oils and in Model System

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-19 DOI:10.1134/S0965544124030137
N. V. Yudina, Yu. V. Loskutova
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Abstract

The effects of temperature gradient on the formation, composition, and strength of oil deposits were investigated. As the crude oil temperature and the wall surface temperature were lowered, the concentrations of the oil fraction and low-molecular-weight paraffins in the deposits increased; simultaneously, the amounts of resins and asphaltenes declined. In the asphalt–resin–paraffin deposits formed in an asphaltene-free oil sample, cooling led to a rise in the content of resins and a decline in the content of the oil fraction. Model experiments demonstrated that the highest inhibitory capacity with respect to paraffin wax deposition was achieved in the case of 0.5–1.0 wt % asphaltenes being added. This can be attributed to the steric effect of aromatic rings manifested in their ability to disrupt the nucleation of paraffin networks. Therefore, the model wax deposits formed after adding asphaltenes exhibited a lower strength than the samples obtained with the addition of benzene resins and alcohol–benzene resins.

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高石蜡原油和模型系统中的石油沉积物
摘要 研究了温度梯度对石油沉积的形成、组成和强度的影响。随着原油温度和壁面温度的降低,沉积物中油组分和低分子量石蜡的浓度增加;同时,树脂和沥青质的含量下降。在不含沥青质的油样中形成的沥青-树脂-石蜡沉积物中,冷却会导致树脂含量上升,而油组分含量下降。模型实验表明,在添加 0.5-1.0 重量百分比沥青质的情况下,石蜡沉积的抑制能力最高。这可归因于芳香环的立体效应,即它们能够破坏石蜡网络的成核。因此,添加沥青质后形成的模型蜡沉积物的强度低于添加苯树脂和醇苯树脂得到的样品。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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