Thermogravimetric Analysis Studies on the Thermal Stability of Asphaltenes: Pyrolysis Behavior of Heavy Oil Asphaltenes

Hauser, A.; Bahzad, Dawoud; Stanislaus, A.; Behbahani, Montaha

doi:10.1021/ef700477a

Cited by 51 publications

(34 citation statements)

References 23 publications

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“…Conversion level in thermal conversion based processes is controlled by colloidal stability of the unconverted product and the associated propensity of this to form soft coke-like substances called sediment or sludge when the colloidal stability gets below a critical limit [21][22][23][24][25][26][27]. Equipment fouling by the coke-like sediments formed in residual oil thermal conversion based processes can lead to significant economic losses because of unplanned shutdown and increased costs of operation [14,22].…”

Section: Maltene→asphaltene→sediment→cokementioning

confidence: 99%

Investigation on sediment formation in residue thermal conversion based processes

Stratiev¹,

Russell²,

Sharpe³

et al. 2014

Fuel Processing Technology

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Section: Maltene→asphaltene→sediment→cokementioning

confidence: 99%

Investigation on sediment formation in residue thermal conversion based processes

Stratiev¹,

Russell²,

Sharpe³

et al. 2014

Fuel Processing Technology

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“…Many reports show that first-order reaction can be acceptably applied to pyrolysis, and therefore, the pyrolysis of VR in this study is assumed to follow a first-order reaction, according to the following equation [7,[20][21][22][23][24][25].…”

Section: Kinetic Analysis Methodsmentioning

confidence: 99%

Kinetic analysis using thermogravimetric analysis for nonisothermal pyrolysis of vacuum residue

Shin

Nho

et al. 2016

J Therm Anal Calorim

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Pyrolysis is a relatively simple upgrading process that can produce light oil from unconventional oil and heavy residue. For effective utilization of pyrolysis processes, it is important to understand its kinetic parameters. In this study, the nonisothermal pyrolysis of vacuum residue (VR) was analyzed using a thermogravimetric analyzer and the activation energy of the VR pyrolysis reaction was estimated by several theoretical methods. It was found that isoconversional methods were more suitable than nonisoconversional methods for analyzing complex pyrolysis reaction of VR. The Friedman method, a differential isoconversional method, is thought to be the most appropriate among the various methods tested because it can describe the complexity of the pyrolysis reaction of VR and there is no need for information of exact reaction model and mathematical assumptions for temperature integral, which can raise systematic errors in the kinetic analysis. Finally, the kinetic parameters of VR pyrolysis were determined based on the results of Friedman analysis and distributed activation energy model (DAEM), and VR pyrolysis behavior was well expressed with the kinetic parameters obtained from DAEM analysis.

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“…A number of research groups have studied asphaltene transformation in hydroprocessing [2,[4][5][6][7][8][9][10][11][12] whereas other studies have focused on the impact of thermal treatment in asphaltene conversion. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Our research group has extensively concentrated on asphaltene characterization over the past few years and has fully studied the impact of thermal treatment on asphaltene molecular structure. For example, Lababidi et al [18] reported notable decrease in asphaltene molecular weight, associated with significant increase in aromaticity, as thermal cracking severity increases.…”

Section: Introductionmentioning

confidence: 99%

Determination of asphaltene structural parameters by Raman spectroscopy

AlHumaidan

Rana

2021

J Raman Spectroscopy

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The objective of this study is to determine the aromatic sheet diameter (L a ) and the number of aromatic sheets per stack (n) for asphaltene molecules from Raman spectra by investigating and optimizing empirical equations proposed in the literature for both crystalline and amorphous carbon materials. The results clearly indicated that the best empirical equation for determining the aromatic sheet diameter for asphaltene was the equation proposed by Tuinstra and Koenig, but only when the graphitization indicator I D /I G would have been determined from the peak integrated ratio, rather than from the peak intensity ratio. The best results of L a were obtained when the Raman spectra were deconvoluted and fitted with three peaks using Gaussian function. The number of aromatic sheets per stack for asphaltene was also determined by examining various empirical equations proposed for crystalline carbon materials. The results indicated that these equations could be applied on asphaltene if the first-order region of Raman spectrum were to be fitted with two peaks, representing the G and D bands. Fitting the spectra with more peaks could result in splitting the G band into two bands (i.e., G and D2 bands), which would shift the G-band position to a wavenumber below 1581.6 cm À1 , and, subsequently, prevent the utilization of these empirical equations.

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Thermogravimetric Analysis Studies on the Thermal Stability of Asphaltenes: Pyrolysis Behavior of Heavy Oil Asphaltenes

Cited by 51 publications

References 23 publications

Investigation on sediment formation in residue thermal conversion based processes

Investigation on sediment formation in residue thermal conversion based processes

Kinetic analysis using thermogravimetric analysis for nonisothermal pyrolysis of vacuum residue

Determination of asphaltene structural parameters by Raman spectroscopy

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