Solubility of normal paraffin hydrocarbons (C20 to C24) and some of their binary mixtures (C22 + C24) and (C23 + C24) in ethylbenzene

Ghogomu, P.M.; Dellacherie, J.; Balesdent, D.

doi:10.1016/0021-9614(89)90151-1

Cited by 39 publications

(36 citation statements)

References 7 publications

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“…The measured phase diagram is shown in Figure 5. Data for the system docosane/ethylbenzene is compared with data by Ghogomu et al [6]. There is a very good agreement between the two sets of data showing the potential of the proposed technique in solid/liquid phase diagram measurements.…”

Section: Figurementioning

confidence: 78%

“…The compositions of the mixtures are presented in Table 1 enthalpies for all these mixtures present positive deviations to the ideality in both the liquid and solid phases. For the binary, the solid fractions measured by calorimetry are compared with those calculated from the phase diagram presented by Ghogomu et al [6]. For the other mixture, the solid fractions are compared with data determined by crystallisation [3].…”

Section: Resultsmentioning

confidence: 99%

“…Comparison between the fraction of crystallised solution measured by the proposed method and the data by Ghogomu et al [6] for solution I (n-C 22 H 46 /ethylbenzene).…”

Section: Resultsmentioning

confidence: 99%

“…It could either be used to directly establish a phase diagram or as a complement to any other phase diagram measurement technique helping to establish the coherence of the measurements, identify and eliminate systematic deviations, or to speed up these measurements by identifying the composition of the invariant points, such as the eutectics, peritectics, or the intermediate compounds compositions [5]. C 22 /EB [6] 0.1 0.12…”

Section: Discussionmentioning

confidence: 99%

“…There is a very good agreement between the two sets of data showing the potential of the proposed technique in solid/liquid phase diagram measurements. Solid-liquid phase diagrams for docosane/ethylbenzene measured by DSC and data from [6].…”

Section: Figurementioning

confidence: 99%

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The Use of Differential Scanning Calorimetry in Studies of Wax Deposition: Measuring the Solid Formation and Binary Solid-Liquid Equilibrium Phase Diagrams

Coutinho¹,

Ruffier-Meray

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -La DSC (Differential Scanning Calorimetry) appliquée à l'étude des dépôts de paraffines : mesure des quantités de dépôts et des diagrammes de phases (liquide-solide) de mélange binaire -L'étude de la cristallisation des paraffines dans les mélanges hydrocarbonés, qu'il s'agisse de pétroles bruts ou de produits raffinés tels que le Diesel ou le fioul, nécessite l'utilisation de techniques expérimentales permettant de déterminer le diagramme de phases. L'acquisition de ces données est primordiale, à la fois pour comprendre les mécanismes de la cristallisation et pour le développement des modèles thermodynamiques. Dans cet article, nous montrons comment l'analyse calorimétrique différentielle peut permettre d'estimer la quantité de solide déposée en fonction de la température et de mesurer les diagrammes de phases de mélanges binaires ne formant pas de solutions solides. Les résultats obtenus avec la méthode proposée s'accordent avec les données de la littérature.Mots-clés : paraffines, dépôts, DSC, équilibres liquide-solide. Abstract -The Use of Differential Scanning Calorimetry in Studies of

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Section: Figurementioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

“…Comparison between the fraction of crystallised solution measured by the proposed method and the data by Ghogomu et al [6] for solution I (n-C 22 H 46 /ethylbenzene).…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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The Use of Differential Scanning Calorimetry in Studies of Wax Deposition: Measuring the Solid Formation and Binary Solid-Liquid Equilibrium Phase Diagrams

Coutinho¹,

Ruffier-Meray

1999

Oil & Gas Science and Technology - Rev. IFP

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Measuring the amount of crystallinity in solutions using DSC

1997

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The amount of solid that forms in a solution at temperatures below the cloud point, is an important quantity in the design of crystallisation processes. A new method using differential scanning calorimetry (DSC) to measure the fraction of crystallised solution, as,o,utio,,, is proposed. A very good agreement is obtained between the data measured by the new calorimetric method and using alternative techniques. A simple graphic version of the calculation procedure is also presented. It is shown to produce quick and fair estimates for the solid fraction by a simple analysis of a plot of enthalpy variation with temperature.La quantite de solides qui se forme dans une solution a des temperatures au-dessous du point de trouble est un facteur important dans la conception des procedes de cristallisation. On propose une nouvelle methode utilisant la calorimetrie differentielle a balayage (DSC) afin de mesurer la fraction de solution cristallisee, Un tres bon accord est obtenu entre les donnees mesurees par la nouvelle methode calorimetrique et d'autres techniques utilisees. On version graphique simple de la procedure de calcul est egalement presentee. On montre qu'elle peut produire des estimations rapides et fiabies pour la fraction de solides par simple analyse d'un trace de variation d'enthaipie avec la temperature.Keywords: solid-liquid equilibrium, calorimetry, DSC, crystallisation.he knowledge of the amount of solid precipitating from T a solution is required in designing and operating plants where either crystallisation is promoted for purification purposes or when solid formation is to be prevented, as for instance with the wax deposition problem. For simple systems when the phase diagram is known the evaluation of the hction of precipitated material can be readily obtained by means of a simple calculation. However this is not the case when dealing with complex mixtures for which neither experimental phase diagrams nor calculation procedures exist to estimate the amount of precipitate being formed at a given temperature. For those systems this quantity can only be assessed experimentally.To evaluate the quantity of precipitated forming at a given temperature a crystallisation of the solution problem can be performed measuring directly or indirectly the fraction of solid material (Van Winkle et a1.,1987; Coutinho and Ruffier-Meray, 1997), but this is time consuming and may be a difficult technique if the phases do not separate easily. An alternative method would be the use of the Differential Scanning Calorimetry (DSC). This is a well known technique but its use for measuring solid fractions is not well understood and seldom used. The procedure presented in some DSC manuals for these measurements is poorly accurate and, to a large extent, empirical. In this work a new methodology for such measurements, along with its thermodynamical background, will be presented. The assumptions and simplifications used in the derivation of the equations are thoroughly stated and from them the limits of applicability of the techni...

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Hydrophobic Effect at the Origin of the Low Solubility of Inert Solid Substances in Hydrogen-Bonded Solvents

Ruelle

Buchmann

Kesselring

1994

Journal of Pharmaceutical Sciences

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Solubility of normal paraffin hydrocarbons (C20 to C24) and some of their binary mixtures (C22 + C24) and (C23 + C24) in ethylbenzene

Cited by 39 publications

References 7 publications

The Use of Differential Scanning Calorimetry in Studies of Wax Deposition: Measuring the Solid Formation and Binary Solid-Liquid Equilibrium Phase Diagrams

The Use of Differential Scanning Calorimetry in Studies of Wax Deposition: Measuring the Solid Formation and Binary Solid-Liquid Equilibrium Phase Diagrams

Measuring the amount of crystallinity in solutions using DSC

Hydrophobic Effect at the Origin of the Low Solubility of Inert Solid Substances in Hydrogen-Bonded Solvents

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