Asphalt flocculation and deposition: I. The onset of precipitation

Rassamdana, Hossein; Dabir, Bahram; Nematy, Mehdi; Farhani, Minoo; Sahimi, Muhammad

doi:10.1002/aic.690420104

Cited by 240 publications

(173 citation statements)

References 38 publications

(41 reference statements)

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“…The asphaltene precipitation is irreversible in such models [16][17][18]. Reversibility experiments are strongly against this type of models; (III) models based on scaling equation in which the properties of complex asphaltenes are not involved [19,20].…”

Section: Asphaltene Deposition Modelsmentioning

confidence: 99%

Correlations between SARA Fractions, Density, and RI to Investigate the Stability of Asphaltene

Chamkalani

2012

ISRN Analytical Chemistry

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Asphaltene precipitation is one of the most common problems in both oil recovery and refinery processes. Its deposition causes many problems mainly because of the fuzzy nature of asphaltene and the large number of parameters affecting precipitation. Unfortunately there is not a predictive technique for screening it. Refractive index (RI) was used as a stability test for asphaltene which makes a quantitative judgment for asphaltene stability. In our study, we first represent a novel correlation between SARA fractions and density and then demonstrate the relation between density and RI; second we developed a relation for SARA and RI, by utilizing RI to investigate the stability of asphaltene.

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Section: Asphaltene Deposition Modelsmentioning

confidence: 99%

Correlations between SARA Fractions, Density, and RI to Investigate the Stability of Asphaltene

Chamkalani

2012

ISRN Analytical Chemistry

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“…Other methods are available to determine the flocculation point, e.g. interfacial tension measurement (Vuong, 1985), electrical conductivity measurement (Fotland et al, 1993) and filtration (Rassamdana et al, 1996, Jiang et al, 1990). …”

Section: Observation Of Flocculation Point By Capillary Viscosimetrymentioning

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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“…They observed that above a ratio of 10mls solvent/g oil, the precipitation is completed and also a decrease in the amount precipitated at very high dilution ratios was observed, which can be attributed, in part, to a partial redissolution of asphaltenes in the solvent. Rassamdana and Sahimi (1996), measured the amount of precipitated asphaltene from an Iranian crude oil using normal alkanes with carbon number ranging from 5 to 10 at 25°C and atmospheric pressure. Eduardo et al (2004), measured the precipitation of heavy organics in two Mexican crude oils and reported to have obtained a good prediction of asphaltene precipitation over a wide temperature, pressure and composition intervals by matching a single titration curve or two precipitation onset points with equation of state.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Compositional Changes of Binary Mixtures of n-alkane solvents on the Precipitation of Heavy Organics from a Solution of Crude Oil Residue

Udourioh¹,

Ibezim-Ezeani²,

Ofodile³

2015

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The effect of precipitant compositional changes on the precipitation of heavy organics (HO) from a solution of crude oil residue using binary mixtures of n-alkane solvents was studied. Heavy organic precipitates were generated using different ratios of C 5 :C 6 , C 6 :C 7 and C 5 :C 7 n-alkane solvents. The result obtained showed that for binary mixtures at 1:0, 3:1, 2:1, 1:1, 1:2, 1:3 and 0:1 ratios, the weight percentage precipitates of C 5 :C 6 were 11. The results have shown that the quantity of HO precipitate decreases with increasing quantity of higher carbon number of n-alkane solvent to a minimum value at 2:1 ratio. From the minimum value, it rises to a maximum at 1:1 ratio as the proportion of C n+x to C n (where C is carbon atom, n and x represent the number of carbon atom) increases. The quantity of HO precipitate decreases again to a minimum at 1:2 ratio as the proportion of C n+x increases further, and finally to the lowest value at pure C n+x . The conclusion is that the components of the crude oil residue undergo a three-stage phase transition as the volume ratios of the n-alkane solvents vary. This study can lead to a better understanding of the phase behavior of heavy organics under compositional changes and hence the prediction of heavy organic precipitation. © JASEM http://dx.doi.org/10.4314/jasem/v19i3.26

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Asphalt flocculation and deposition: I. The onset of precipitation

Abstract: Formation of asphalt aggregates and their deposition on the pore s u~a c e s of a porous

Cited by 240 publications

References 38 publications

Correlations between SARA Fractions, Density, and RI to Investigate the Stability of Asphaltene

Correlations between SARA Fractions, Density, and RI to Investigate the Stability of Asphaltene

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

The Effect of Compositional Changes of Binary Mixtures of n-alkane solvents on the Precipitation of Heavy Organics from a Solution of Crude Oil Residue

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