A comprehensive review on the significant tools of asphaltene investigation. Analysis and characterization techniques and computational methods

Hassanzadeh, Masoumeh; Abdouss, Majid

doi:10.1016/j.petrol.2021.109611

Cited by 14 publications

(11 citation statements)

References 157 publications

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“…Only data obtained using the same method under equivalent conditions can be considered comparable. The vapor pressure osmometry (VPO) method, which employs vapor pressure permeation, is commonly used to measure the average relative molecular weight [8][9][10]. The basic structure of resin and asphaltene molecules in petroleum consists of a dense aromatic ring system as the core, with multiple fused aromatic rings, surrounded by several cycloalkane rings.…”

Section: Introductionmentioning

confidence: 99%

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

Wang,

Li,

Wang

et al. 2024

Molecules

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This study investigates the synthesis of mesophase pitch using low-cost fluid catalytic cracking (FCC) slurry and waste fluid asphaltene (WFA) as raw materials through the co-carbonization method. The resulting mesophase pitch product and its formation mechanism were thoroughly analyzed. Various characterization techniques, including polarizing microscopy, softening point measurement, Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA), were employed to characterize and analyze the properties and structure of the mesophase pitch. The experimental results demonstrate that the optimal optical texture of the mesophase product is achieved under specific reaction conditions, including a temperature of 420 °C, pressure of 1 MPa, reaction time of 6 h, and the addition of 2% asphaltene. It was observed that a small amount of asphaltene contributes to the formation of mesophase pitch spheres, facilitating the development of the mesophase. However, excessive content of asphaltene may cover the surface of the mesophase spheres, impeding the contact between them and consequently compromising the optical texture of the mesophase pitch product. Furthermore, the inclusion of asphaltene promotes polymerization reactions in the system, leading to an increase in the average molecular weight of the mesophase pitch. Notably, when the amount of asphaltene added is 2%, the mesophase pitch demonstrates the lowest ID/IG value, indicating superior molecular orientation and larger graphite-like microcrystals. Additionally, researchers found that at this asphaltene concentration, the mesophase pitch exhibits the highest degree of order, as evidenced by the maximum diffraction angle (2θ) and stacking height (Lc) values, and the minimum d002 value. Moreover, the addition of asphaltene enhances the yield and aromaticity of the mesophase pitch and significantly improves the thermal stability of the resulting product.

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Section: Introductionmentioning

confidence: 99%

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

Wang,

Li,

Wang

et al. 2024

Molecules

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“…(16). In heavy crude oils, asphaltenes structure, size and interaction can change due to external conditions, such as temperature and pressure (17)(18)(19). Thus, the ultrasound energy can be employed to destruct the aggregation of the asphaltenes, which significantly reduces the viscosity of the fluid (20)(21)(22).…”

Section: Introductionmentioning

confidence: 99%

Relaxation Process in Crude Oil after Ultrasonic Treatment

Baimukhametov,

Dengaev,

Safiullina

et al. 2024

IJE

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This paper presents an investigation on changes in viscosity and group composition of heavy oil samples after ultrasonic upgrading process. Heavy oil samples correspond to different oilfields (located in Russia) were processed under various ultrasonic mode, the cavitation consequence of which was controlled by acoustic method. The viscosity of samples was measured just after ultrasonic treatment, 10 minutes, and 1-34 days. The saturate, aromatic, resin and asphaltene (SARA) analysis was carried out after ultrasonic treatment with 34 days of relaxation and the achieved results were compared with the SARA fractions of original crude oil. The results of viscosity measurement showed viscosity reduction after the ultrasonic treatment. However, the viscosity was regressed after 1-4 days of relaxation with further reduction in 7 days. The degree of viscosity increase after 34 days was only 10% in contrast to viscosity of original crude oil. The power and the sonication time did not influence the relaxation process. In conclusion, attention was drawn to the results of SARA analysis, the content of saturates decreased and the relative content of heavy fragments such as resins and asphaltenes was increased, which determines the degree of viscosity increase after relaxation period.

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“…There are many recent review articles summarizing the various techniques for characterizing thermodynamic stability and deposition tendency of asphaltenes with both experimental methods and simulation tools. ,− Experimental techniques and models used to determine asphaltene stability indicate whether asphaltenes precipitate or not. This does not necessarily prove that asphaltenes will deposit.…”

Section: Introductionmentioning

confidence: 99%

“…Simulating asphaltene phase behavior with an EOS model requires a characterization procedure to define the pseudocomponents comprising the heavy end of the oil. , The most common characterization method for modeling asphaltene precipitation is the SARA-based procedure in which the stock tank liquid (STL) is divided into four pseudofractions according to the SARA (saturates, aromatics, resins, and asphaltenes) analysis. This method has been coupled with various EOS models, including PC-SAFT, − CPA, − and recently with the classical cubic EOS .…”

Section: Introductionmentioning

confidence: 99%

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

Khaleel

Sisco²,

Tavakkoli³

et al. 2022

Energy Fuels

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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.

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A comprehensive review on the significant tools of asphaltene investigation. Analysis and characterization techniques and computational methods

Cited by 14 publications

References 157 publications

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

Relaxation Process in Crude Oil after Ultrasonic Treatment

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

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