Critical review of asphaltene properties and factors impacting its stability in crude oil

Fakher, Sherif; Ahdaya, Mohamed; Elturki, Mukhtar; Imqam, Abdulmohsin

doi:10.1007/s13202-019-00811-5

Cited by 181 publications

(123 citation statements)

References 119 publications

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“…and asphaltenes (4.85 % wt.). It should be noted that asphaltenes, in turn, are stabilizers of molecular weight growth and as a whole make a certain contribution in improving the technological parameters of the obtained bitumen [12][13][14][15].…”

Section: Resultsmentioning

confidence: 99%

Preparation of modified oil road bitumen

Каримов¹,

Shakulikova

Ishmukhamedova

et al. 2020

E3S Web Conf.

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The aim of this work is to study the possibility of developing oil road bitumen by goudron oxidation of mixed base oils with the softening temperature of 24 °C from the Martyshi and Mangistau deposits using vacuum residue of more than 450 °C of highly resinous oil from the Karazhanbas deposit of the Republic of Kazakhstan as an additive, elemental sulfur modifier and induction moments. Karazhanbas oil has a high content of oil tars (24.18 % wt.) and asphaltenes (4.85 % wt.). The oxidation of goudron and vacuum residue of highly resinous oil was carried out in a bubble reactor when thermostating at 200 - 210 °С, specific air consumption of 1.8 – 2 l/min·kg. The oxidation process of the feedstock was completed when the viscosity of bitumen was reached by the ring-andball method of 32-35 °C. Oil bitumen was obtained with the following technological characteristics: penetration at 25 °C 105 mm, melting point 51 °C, tensibility at 25 °C 67 cm, flash point 230 °C, brittle temperature minus 15 °C.

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Section: Resultsmentioning

confidence: 99%

Preparation of modified oil road bitumen

Каримов¹,

Shakulikova

Ishmukhamedova

et al. 2020

E3S Web Conf.

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“…Concerning the structure of asphaltene, many different models have been proposed [3,4,19,31,32]. ere are two main types of asphaltene: island-type asphaltene has a single large aromatic core, and archipelago-type asphaltene has many small fused-ring structures connected by alkyl chains [33]. e island-type structure has a single fused-ring aromatic core and is relatively stable, whereas the archipelagotype structure has multiple fused-ring aromatic nuclei and is less stable [34].…”

Section: Molecular Modelsmentioning

confidence: 99%

Investigating the Compatibility of Various Components in Marine Low-Sulfur Fuel Oil by Molecular Dynamics Simulations

Zhou

Wei

Xue

et al. 2021

Journal of Chemistry

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Asphaltene aggregation and precipitation are one of the major issues for marine low-sulfur fuel oil used on board. Many research studies have been carried out to investigate the aggregation behavior of asphaltene under different conditions, but the mechanism of asphaltene aggregation in low-sulfur fuel oil at the molecular level is still unclear. In this work, molecular dynamics (MD) simulations were performed to calculate the solubility parameters, intermolecular interaction energies, and radial distribution function (RDF) curves of each component in marine low-sulfur fuel oil to examine their mutual compatibility. Simulation results indicate that the solubility parameter of resin gains the highest value and it is close to asphaltene. The solubility parameters of aromatic, hexadecane, and saturate decrease successively. The interaction energy between resin and asphaltene molecules is higher than that between the same kind of molecules, which means that resin can inhibit the aggregation of asphaltene molecules. Typically, a light distillate component (hexadecane) is added to heavy fuel oil to yield low-sulfur oil, and our calculations reveal that this has a negative effect on asphaltene aggregation. Specifically, asphaltene is more likely to self-aggregate, as shown by the increase in peak height in the radial distribution function of the asphaltene-asphaltene pair. The findings of this study will provide theoretical support for the production of marine low-sulfur fuel.

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“…Asphaltene is extremely complex. Several models were developed in an attempt to provide a standard method that could cover all different asphaltene chemical structures and simulate these structures [10,14]:…”

Section: Asphaltene Structurementioning

confidence: 99%

Analysis of the Modern State of Researches on Deposition of Asphalt-Resin Substances, Paraffin and Modeling Methods Review Part I: Precipitation of Asphaltenes

Manafov¹,

Келбалиев²

2020

AChJ

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Asphaltenes are the heaviest crude oil fraction and tend to self-associate and precipitate. The precipitation and deposition of asphaltenes during the production, refining, transportation of oil is the main for the oil industry, the precipitation of asphaltenes and their subsequent deposition can cause problems at all stages of production. Asphaltenes have different structures and molecular composition, they are a mixture of poorly defined components, they are self-associated even at very low concentrations, what makes them one of the most difficult components of crude oil. Since the deposition mechanism of paraffin wax differs from the deposition mechanism of asphaltenes, mathematical modeling of crystallization of paraffin will be considered separately in another work. Creating accurate asphaltene models that can predict the behavior of asphaltenes in various scenarios should help reduce asphaltene problems. This review is specifically devoted to advances in mathematical modeling of asphaltenes. Several different models have been proposed in the literature for predicting the initial conditions and precipitation of asphaltenes. Existing modeling approaches can be broadly classified into colloidal and thermodynamic models. It should be noted intelligent models, such as a vector machine, an artificial neural network, in recent years are increasingly used for modeling various parameters and properties in the oil and chemical industries. However, these models are a black box and cannot provide a clear link between the output and input parameters of the model. In the past few years, models based on the Cubic Plus EoS Association (CPA EoS) and Statistical associating fluid theory (SAFT) have been recognized as promising one for studying asphaltene sediments. However, in the literature, there exist different opinions. Therefore, a systematic study is important for modeling the deposition of asphaltenes. Over the past decades, several different models have been proposed to predict the onset of asphaltenes and the amount of asphaltenes deposited. This paper examines various models that have been proposed to predict asphaltenes deposition under changing thermobaric conditions. A brief summary of various research approaches is presented.The main focus is on the description of the basic assumptions underlying various models, as well as on the ability of the model to correspond to experimental data. The presented models are compared and current modeling trends for forecasting precipitation are shown. This work will help improve understanding of asphaltenes and provide recommendations for the proper study and modeling of asphaltenes in future research.

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Critical review of asphaltene properties and factors impacting its stability in crude oil

Cited by 181 publications

References 119 publications

Preparation of modified oil road bitumen

Preparation of modified oil road bitumen

Investigating the Compatibility of Various Components in Marine Low-Sulfur Fuel Oil by Molecular Dynamics Simulations

Analysis of the Modern State of Researches on Deposition of Asphalt-Resin Substances, Paraffin and Modeling Methods Review Part I: Precipitation of Asphaltenes

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