A phase-separation kinetic model for coke formation

Wiehe, Irwin A.

doi:10.1021/ie00023a001

Cited by 328 publications

(336 citation statements)

References 18 publications

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“…As conversion proceeds therefore, the residues processed become less stable, sometimes precipitating to such a point that they block up the pipes and the exchangers. Studies conducted on asphaltenes to investigate the conversion mechanisms have been described in several publications: Merdrignac et al (2004), Bartholdy and Andersen (2000), Wiehe (1992 and1993). Many questions are still unanswered, however, since prediction of flocculation phenomena remains a challenge: -what is the maximum conversion rate possible for a given crude without destabilising the effluents?…”

Section: Introduction -Reminder Of the Stakesmentioning

confidence: 99%

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

Pina¹,

Mougin²,

Béhar³

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Caractérisation des asphaltènes et modélisation de la floculation -État de l'Art -Ce travail présente un état de l'art concernant la floculation des asphaltènes avec deux grands items : la caractérisation des asphaltènes dans différents milieux et la modélisation de la floculation. Cette revue commence par une caractérisation des asphaltènes proprement dite puis des caractérisations de ces derniers dans des solvants synthétiques ou des bruts. Nous insistons sur les techniques de détermination de masses molaires et de diffraction. L'incidence d'un ajout de bon/mauvais solvant est également discutée. La seconde partie de cette revue concerne la modélisation de la floculation. Elle examine les différents modèles de la littérature avant de présenter celui de Szewczyk et Béhar (1999) et son intégration dans un simulateur de réservoir. Les modèles disponibles requièrent encore des données expérimentales délicates à acquérir et un effort de recherche doit être réalisé pour améliorer cet état de fait. Abstract -Characterisation of Asphaltenes and Modelling of Flocculation -State of the Art -This document describes a state of the art concerning the flocculation of asphaltenes with two major sections: characterisation of asphaltenes in various environments and modelling of flocculation. This review starts with the characterisation of asphaltenes as such, then their characterisation in synthetic solvents or crudes. Emphasis is placed on molar mass determination and diffraction techniques. The impact of adding a good/poor solvent is also discussed. The second part of this review is dedicated to modelling.We first examine the various models in the literature before describing the Szewczyk and Béhar (1999) model and its integration in a reservoir simulator. The models available still require experimental data which is difficult to collect and further research is needed to improve this situation.Petroleum Industry Applications of Thermodynamics Applications de la thermodynamique dans l'industrie pétrolière

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Section: Introduction -Reminder Of the Stakesmentioning

confidence: 99%

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

Pina¹,

Mougin²,

Béhar³

2006

Oil & Gas Science and Technology - Rev. IFP

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“…Thermal conversion of asphaltenes resulting in the formation of coke has been reported for reaction under more severe conditions. For instance, Cold lake-derived asphaltenes has been reported to form coke by conversion at 400°C [24]. In addition, it has been stated that the presence of heptane-soluble material inhibits formation of coke by asphaltenes.…”

Section: Discussionmentioning

confidence: 99%

Low-temperature oxidative asphaltenes liquefaction for petrochemicals: fact or fiction?

Sánchez

Klerk

2016

Appl Petrochem Res

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Asphaltene is the heavy and heteroatom-rich fraction of petroleum that is rejected during a solvent deasphalting process. In patent literature there are claims that state that this material can be converted into an aromatic petrochemical feedstock by oxidative liquefaction at low temperature. To evaluate the validity of these claims, asphaltenes from an industrial solvent deasphalting process were oxidized with dry and water-saturated air at temperatures in the range 45-100°C. Infrared spectroscopy of the oxidized product confirmed that oxygen was incorporated as C=O and C-O. Under all experimental conditions studied little oxidative degradation was observed that would lead to the production of a petrochemical feedstock. Nevertheless, some observations of scientific value were made about the low-temperature conversion of asphaltenes. During autoxidation with dry air, the n-pentane-insoluble fraction increased. On the contrary, when oxidation was conducted with water-saturated air, the formation of additional n-pentane-insoluble material was suppressed. Mild heating of asphaltenes under nitrogen atmosphere also caused the n-pentane-insoluble content to increase. Spectroscopic evidence showed that esters are formed during oxidation at *100°C. The temperature dependence of this reaction was explained and a possible reaction pathway for cycloalkane to ester conversion was presented. Ester selectivity was determined by the competition between hydrogen abstraction and b-scission of the alkoxy radical.

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“…As most of the previous researches suggested, the asphaltene decomposition obeyed first-order (Trauth et al, 1992;Wiehe, 1993;Yasar et al, 2001;Zhao et al, 2001) or second-order kinetic (Martinez et al, 1997;Wang and Anthony, 2003;. Considering the complexity of upgrading asphaltene in SCW, a mathematical model with a power law was expressed in the following form:…”

Section: Kinetics Of Upgrading Asphaltene In Scwmentioning

confidence: 99%