沥青质多分散性对沥青质沉淀和沉积趋势影响的研究,Energy & Fuels

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沥青质多分散性对沥青质沉淀和沉积趋势影响的研究
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-07-18 , DOI: 10.1021/acs.energyfuels.2c01064
Aisha T. Khaleel ₁ , Caleb J. Sisco ₂ , Mohammad Tavakkoli ₂ , Francisco M. Vargas _{1,

2}

Affiliation

众所周知，沥青质是存在于原油中的多分散部分，具有广泛的尺寸分布和分子特征。然而，在实践中，沥青质通常在实验室和建模工作中作为单分散部分进行处理。在这项工作中，使用高压、高温填充床沉积柱对两种具有相同总沥青质但具有不同沥青质多分散性分布的模型油进行了沥青质沉积测试。尽管用于制备两种油的沥青质是从同一来源提取的，但观察到沉积的沥青质量存在巨大差异，这归因于两个样品之间沥青质多分散性的差异。此外，使用紫外-可见光谱，可以观察到从不同地理位置获得的沥青质亚馏分的芳香性之间存在一些相似之处。建模结果提供了关于沥青质多分散性对起始和沥青质沉淀量的影响的更多见解。这项工作中提出的结果表明，沥青质的多分散性在确定在不同油中观察到的沥青质沉淀和沉积趋势中起主要作用。

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An Investigation of the Effect of Asphaltene Polydispersity on Asphaltene Precipitation and Deposition Tendencies

It is well-known that asphaltenes are a polydisperse fraction present in crude oil with a broad distribution of sizes and molecular characteristics. However, in practice, asphaltenes are often treated both in the laboratory and in modeling work as a monodisperse fraction. In this work, asphaltene deposition tests with two model oils with the same total amount of asphaltenes but with different asphaltene polydispersity distributions were conducted using a high-pressure, high-temperature packed-bed deposition column. Although the asphaltenes used to prepare the two oils were extracted from the same source, a drastic difference in the amount of asphaltene deposited was observed, which is attributed to the difference in the asphaltene polydispersity between the two samples. Additionally, using UV–visible spectroscopy, it is possible to observe some similarities between the aromaticity of asphaltene subfractions obtained from different geographical locations. Modeling results provide additional insights into the impact of asphaltene polydispersity on the onset and the amount of asphaltene precipitation. The results presented in this work suggest that asphaltene polydispersity plays a major role in determining asphaltene precipitation and deposition tendencies observed in different oils.

更新日期：2022-07-18

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