Solubility parameters

Barton, Allan F. M.

doi:10.1021/cr60298a003

Cited by 1,023 publications

(676 citation statements)

References 24 publications

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“…24 The regular solution theory is based on the assumption that the enthalpic and entropic part of the Gibbs free energy of formation can be treated separately and are additive. 25 The regular solution theory is best explained using the lattice model.…”

Section: Regular Solution Theorymentioning

confidence: 99%

Asphaltene Precipitation Models: A Review

Subramanian

Simon

Sjöblom

2015

Journal of Dispersion Science and Technology

114

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Asphaltenes are the heaviest and the most polar fraction of crude oil and are defined as a solubility class (typically soluble in toluene but insoluble in n-alkanes like n-heptane).Precipitation and deposition of asphaltenes during production, processing and transportation of oil is a major challenge faced by oil industry. Over the last thirty years, a number of different models have been proposed for predicting the onset of asphaltene precipitation and also the amount of precipitated asphaltenes. This article reviews the different models that have been proposed for predicting asphaltene precipitation either at atmospheric pressure or under depressurization. A brief summary of the different modeling approaches is presented followed by description of work done by different research groups. Our focus will be on the description of the basic assumptions underlying different models and also the ability/performance of the model to match the experimental data. Finally, a comparison of models is presented and discussed along with suggestions for improvement. Keywords:Asphaltene precipitation, Thermodynamic models, Solubility models, Equation of state models, Colloidal models INTRODUCTIONAsphaltenes are considered to represent the most polar and the heaviest components in crude oil. 1 They are a solubility class and defined as the fraction that is insoluble in n-alkane (like n-heptane) but soluble in aromatic solvents (like toluene). [2][3] The precipitation and deposition of asphaltenes during production and transport of crude oil is recognized as a serious problem in the oil industry since it can lead to formation damage, plugging of wellbores and production facilities. [4][5] Asphaltene precipitation can be encountered during primary recovery of oil as well as during enhanced oil recovery operations like miscible flooding with CO 2 or natural gas. 6The precipitation of asphaltenes occurs due to a number of reasons. These include changes in pressure, temperature, chemical composition of crude oils, acid stimulation, mixing of oil with diluents, other oil and gas components like CO 2 . 4 Heavy crudes usually have a lower tendency to give asphaltene deposition problems inspite of their higher asphaltene content.This observation is normally attributed to their higher resin content and lower saturate content. 7Asphaltenes are generally assumed to be composed of fused ring aromaticity, small aliphatic side chains and heteroatom functional groups. 8 The molecular weight of asphaltenes has been a source of controversy for a very long time. 9 It is now recognized to be close to 750 g/mol with a factor of 2 in the width of the molecular weight distribution. Solubility ApproachThe solubility models are most commonly used for predicting asphaltene precipitation. These models make use of the concept of solubility parameter and assume that petroleum crude Models based on Solution theory and Flory-Huggins theory assume that asphaltenes have homogenous structure and properties while models based on Scott-Magat theory assum...

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Section: Regular Solution Theorymentioning

confidence: 99%

Asphaltene Precipitation Models: A Review

Subramanian

Simon

Sjöblom

2015

Journal of Dispersion Science and Technology

114

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“…When the heat of mixing is given by the Hildebrand-Scatchard regular solution theory [20,21,22,23] the χ ij -parameter can be obtained using the solubility parameters δ i (T ), δ j (T ) for the pure components in the mixture, which themselves are temperature-dependent. We have…”

Section: Temperature Dependence Of the Dpd Interaction Parametersmentioning

confidence: 99%

Selected Topics of Computational and Experimental Fluid Mechanics

Klapp¹

2015

Environmental Science and Engineering

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“…Nous avons par conséquent préconisé une méthodologie de recherche qui consiste à étu-dier i) la solubilité des coréactifs par la détermi-nation des paramètres de solubilité et du rayon de la sphère de solubilité ( i R) de Hansen [14,15] figure 3 du carbonate de glycérol [16], des acides gras et de l'oléate de méthyle de tournesol oléique, ii) le pouvoir compatibilisant de l'ester de carbonate de glycérol (produit final) sur les coréactifs par le suivi de l'évolution de la tension interfaciale des systèmes composés de carbonate de glycérol/acide gras/ester de carbonate de glycérol ou de carbonate de glycérol/ester gras/ester de carbonate de glycérol pour les sondes chimiques étudiées : l'estérification et l'alcoolyse. L'évolution de la tension interfaciale des systèmes est suivie en fonction du temps et de la concentration en ester de carbonate de glycérol dilué dans l'acide gras ou dans l'ester gras [17].…”

Section: Démarcheunclassified

Conférence Chevreul

Mouloungui

2004

OCL

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Solubility parameters

Cited by 1,023 publications

References 24 publications

Asphaltene Precipitation Models: A Review

Asphaltene Precipitation Models: A Review

Selected Topics of Computational and Experimental Fluid Mechanics

Conférence Chevreul

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