Reactivity of Vacuum Residues by Thermogravimetric Analysis and Nuclear Magnetic Resonance Spectroscopy

León, A Y; M, Alexander Guzmán; Picón, Héctor; C, Dionisio Laverde; Molina, Daniel

doi:10.1021/acs.energyfuels.0c00200

Cited by 14 publications

(8 citation statements)

References 56 publications

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“…This observation confirms that the thermal cracking process is preceded by a vaporization stage, but as the temperature increases more chemical cracking reactions are induced. The thermal reaction stages in the TGA results are represented by the activation energies E a 1 and E a 2 , corresponding to the vaporization and thermal cracking stages, and can be calculated from the slopes − E a / R of the straight lines 27 . The kinetic parameters of the vaporization and thermal cracking sections were obtained by linear regression.…”

Section: Resultsmentioning

confidence: 99%

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The effect of cationic surfactants on bitumen's viscosity and asphaltene nanostructure under thermal partial upgrading

Abdrabou

Han

Zheng

et al. 2022

Energy Science & Engineering

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Bitumen extracted from oil sands is a highly viscous fluid; thus, its transportation via pipelines in its original form resembles a major challenge. Partial upgrading is a recently proposed approach that aims to reduce bitumen's viscosity to meet the pipeline specifications. To optimize the process and make it more cost-effective, a novel approach is proposed and researched in this study. Ionic surfactants were for the first time employed to promote thermal cracking reactions and dispersion of asphaltenes in bitumen at elevated upgrading temperatures. Three surfactants representing the cationic, nonionic, and anionic charges were studied at the thermal upgrading conditions (360-400 • C) at their optimal addition ratios to mimic the bitumen partial upgrading conditions. The results demonstrated that the cationic surfactant (dodecyltrimethylammonium bromide, DTAB) surpassed the other two surfactants and that with the addition of only 0.25 wt% of it, it can effectively reduce the viscosity of bitumen by up to 60% more than the upgraded bitumen with no additives under the same upgrading temperature.The Saturates, Aromatics, Resins, and Asphaltene analysis revealed that the contents of saturates and aromatics within the upgraded bitumen were also enhanced when DTAB was added. Moreover, the detailed asphaltene nanostructural analysis using X-ray diffraction, high-resolution transmission electron microscope, and thermogravimetric analysis revealed that the addition of the cationic surfactant (DTAB) resulted in an increased asphaltene nanostructural disorder, smaller polycyclic aromatic hydrocarbons size, and increased fringe curvature, as compared with the upgraded bitumen's asphaltene with no surfactants. Hence, the results have suggested that DTAB, a cheap and readily available ionic surfactant, can serve as a potential upgrading additive for designing partial upgrading procedures to produce upgraded bitumen with much less viscosity at lower upgrading temperatures.

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Section: Resultsmentioning

confidence: 99%

“…Further analysis of the thermal stability of the upgraded oil was performed by calculating the activation energy of oil-cracking conversion using the kinetic model discussed in reference [27]. In this model, the oil fraction…”

Section: The Effect Of Temperature and Surfactant On Bitumen's Activa...mentioning

confidence: 99%

The effect of cationic surfactants on bitumen's viscosity and asphaltene nanostructure under thermal partial upgrading

Abdrabou

Han

Zheng

et al. 2022

Energy Science & Engineering

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“…Then, the reactor is pressurized with nitrogen at room temperature. Figure shows a schematic of the reaction system used for aquathermolysis …”

Section: Methodsmentioning

confidence: 99%

“…Figure 1 shows a schematic of the reaction system used for aquathermolysis. 52 The reactions were carried out at 270 °C, with a pressure of 5.51 MPa. The reaction time was 66 h. The aquathermolysis reactions without catalyst (no catalyst) were carried out under the same temperature, pressure, and reaction time conditions.…”

Section: Catalytic Aquathermolysis Testsmentioning

confidence: 99%

Effect of the Catalytic Aquathermolysis Process on the Physicochemical Properties of a Colombian Crude Oil

et al. 2021

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In this work, the catalytic aquathermolysis process of a Colombian heavy crude oil was studied. Reactivity tests were conducted in a microbatch reactor at 270 °C and saturation pressure of 5.5 MPa, during 66 h, using iron and molybdenum naphthenates in concentrations of 50−300 ppm as catalysts. The use of these catalysts reduced the gas yield from 1% to 4.2% w/w, the viscosity from 10% to 52.3% with iron naphthenate, and from 11.6% to 31.4% with molybdenum naphthenate. Crudes subjected to catalytic aquathermolysis increased their API gravity from 1.1 to 2.5 and 0.5 to 1.8 units, showing a significant decrease in complex fractions with boiling points above 340 °C and conversions in the order of 7% and 8% with respect to the precursors of molybdenum and iron naphthenates. Unlike other studies, the changes in the physical properties were correlated with changes in the chemical structure by ATR-FTIR spectroscopy. The average molecular parameters showed that the greatest differences with respect to the base crude oil were the length of the alkyl chains, the aromaticity, and the sulfurization. Results indicate different characteristics from the catalysts being studied, with iron naphthenate yielding better favorable effects in the change of the physicochemical properties of the improved crude oils. The experimental methodology proposed in this work indicates that the catalytic aquathermolysis process is a recovery method that allows for improving the properties of the crude oils, under reservoir conditions, due to the formation of products of smaller size and molecular weight.

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“…Combustibles líquidos (Agudelo et al, 2011;Baldrich & Novoa, 2006;Benjumea et al, 2008;Cacua et al, 2011b;Zuleta et al, 2012) y sólidos(É. Arenas & Chejne, 2004;Blandon et al, 2008;Díez & Pérez, 2017;Jiménez et al, 2012;Orrego et al, 2010;Orrego-Ruiz et al, 2011;Reyes et al, 2003) Fracciones de petróleo (Baldrich Ferrer & Novoa Mantilla, 2007;León et al, 2020;Morantes et al, 2019;Poveda-Jaramillo et al, 2016;Villabona-Estupiñan et al, 2020) Productos de la combustión (Arias et al, 2021;Ávila et al, 2021;Botero et al, 2020Botero et al, , 2021Cadrazco et al, 2019Cadrazco et al, , 2020Johnson-Restrepo et al, 2008;Mendoza et al, 2021;Oliveira et al, 2019;Parga-Lozano et al, 2002;Soriano et al, 2020) Propiedades claves de combustibles como velocidad de llama laminar, las dimensiones y temperatura de la llama, el índice Wobbe, los calores inferiores y superiores de combustión, los límites de inflamabilidad y el punto de rocío (Álvarez et al, 2019;Burbano et al, 2011aBurbano et al, , 2011bCacua et al, 2011b;Y. Cadavid & Amell, 2019;Cala et al, 2013;Cardona Medina et al, 2013;Cardona-Vargas et al, 2020;Cardona Vargas & Amell-Arrieta Andrés Adolfo Arrieta Carlos, 2016;…”

Section: Koreaunclassified

Hacia una estructura de investigación y educación para la prevención de accidentes por incendios y explosiones en Colombianción de accidentes por incendios y explosiones en Colombia

Molina

López

Escobar

et al. 2021

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Se analizó la situación actual de la investigación y la educación en incendios y explosiones en Colombia desde un enfoque de ciencia e ingeniería y se hicieron recomendaciones sobre los campos que deben desarrollarse para crear una estructura investigativa y educativa que respalde los esfuerzos por prevenirlos. Dado el riesgo de incendios y explosiones, la mayoría de los países han propiciado la creación de centros de investigación y educación orientados al desarrollo científico en esta área. En Colombia tal infraestructura tiene un desarrollo apenas incipiente. La revisión de aspectos importantes en incendios y explosiones como el análisis estadístico, la caracterización fisicoquímica de sustancias inflamables, la cinética química, la combustión, la simulación, la radiación térmica, los fenómenos de pirólisis, el smouldering, la formación de hollín y de humo, la caracterización experimental, la evaluación de riesgos, la educación y otros aspectos específicos de las explosiones evidenció que en Colombia existe un buen desarrollo en la aplicación de la combustión y la pirólisis con fines comerciales, pero sin énfasis en incendios y explosiones. En las demás áreas existen antecedentes de investigación específicamente relacionados con este campo que deben reforzarse. Se recomienda la creación de programas curriculares de posgrado en ciencia y tecnología en esta área, así como el aumento de la capacidad experimental para la caracterización de sustancias inflamables, el fortalecimiento de la investigación en ciencias básicas y el desarrollo de habilidades de computación y simulación.

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Reactivity of Vacuum Residues by Thermogravimetric Analysis and Nuclear Magnetic Resonance Spectroscopy

Cited by 14 publications

References 56 publications

The effect of cationic surfactants on bitumen's viscosity and asphaltene nanostructure under thermal partial upgrading

The effect of cationic surfactants on bitumen's viscosity and asphaltene nanostructure under thermal partial upgrading

Effect of the Catalytic Aquathermolysis Process on the Physicochemical Properties of a Colombian Crude Oil

Hacia una estructura de investigación y educación para la prevención de accidentes por incendios y explosiones en Colombianción de accidentes por incendios y explosiones en Colombia

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