The effect of the addition of water, propane, or docosane on the vapour–liquid and solid–fluid equilibria in asymmetric binary n-alkane mixtures

Flöter, Eckhard; Hollanders, Bart; Loos, Theo W. de; Arons, J. de Swaan

doi:10.1016/s0378-3812(97)00315-4

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…In conclusion the phase diagram of the system methane + heptadecane is qualitatively similar to those of binary mixtures made up of methane plus an heavy alkane with an even number of carbon atoms (C 16 , C 20 , C 22 , C 24 ) previously investigated by de Loos and co-workers [8,[10][11][12]. The difference in the solid phases structure and the presence of a solid-solid phase transition does not affect significantly the phase diagram determined.…”

Section: Resultssupporting

confidence: 74%

“…A heavy alkane with an odd number of carbon atoms was chosen since mixtures of paraffins crystallise in an orthorhombic structure similar to that presented by pure odd paraffins. A number of binary methane + paraffin systems have been studied previously [8][9][10][11][12][13] but most of them used paraffins with an even number of carbon atoms. Therefore, the investigation of this system was necessary to evaluate the effect of the crystalline structure on the phase diagram before carrying out studies on complex waxes.…”

Section: Introductionmentioning

confidence: 99%

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High pressure phase equilibria in methane+waxy systems

Pauly

Coutinho

Daridon

2007

Fluid Phase Equilibria

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

High pressure phase equilibria in methane+waxy systems

Pauly

Coutinho

Daridon

2007

Fluid Phase Equilibria

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“…Here, the model results for binary asymmetric systems (with experimental wax phase boundary data available) methane + n -hexadecane, methane + n -heptadecane, methane + n -eicosane, methane + n -docosane, methane + n -tetracosane, and methane + n -triacontane are presented. A total of 457 data points of WDT in binary asymmetric mixtures are used for evaluations.…”

Section: Resultsmentioning

confidence: 99%

A New Thermodynamic Model for Paraffin Precipitation in Highly Asymmetric Systems at High Pressure Conditions

Mahabadian

Chapoy

Tohidi

2016

Ind. Eng. Chem. Res.

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The predictions of the crystallization temperature and the amount of precipitates of paraffin waxes at high pressure conditions may be inaccurate using existing thermodynamic models. This is mainly due to the lack of experimental data on the molar volume of solid paraffins at high pressures. This inaccuracy is even more pronounced for mixtures of high asymmetry. The present work provides a new accurate modeling approach for solid–fluid equilibrium (SFE) at high pressure conditions, more specifically, for highly asymmetric systems. In contrast to the conventional methods for high pressure SFE modeling which define a Poynting molar volume correction term to calculate the paraffin solid phase nonideality at high pressures, the new method exploits the values of thermophysical properties of importance in SFE modeling (temperatures and enthalpies of fusion and solid–solid transition) evaluated at the high pressure condition using a new insight into the well-known Clausius–Clapeyron equation. These modified parameters are then used for evaluation of the fugacity in the solid phase at higher pressure using the fugacity of pure liquid at the same pressure and applying the well-established formulation of the Gibbs energy change during melting. Therefore, the devised approach does not require a Poynting correction term. The devised approach coupled with the well-tested UNIQUAC activity coefficient model is used to describe the nonideality of the solid phase. For the fluid phases, the fugacities are obtained with the SRK EoS with binary interaction parameters calculated with a group contribution scheme. The model is applied to highly asymmetric systems with SFE experimental data over a wide range of pressures. It is first used to predict crystallization temperature in binary systems at high pressures and then verified by applying it on multicomponent mixtures resembling intermediate oil and natural gas condensates.

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“…For these systems, the verification of our analysis was made through eq 23, which is only a special case of the general problem. On the other hand, the solubility of solids near the second critical end-point is relevant in geochemistry to understand the behavior of gascondensate reservoir fluids , or the rheology of rocks and composition of magma. , Unfortunately, none of the available studies allows the calculation of the Setchenov constant. Hence, we have to restrict our comparison to the case of very slightly soluble solids.…”

Section: Experimental Evidencementioning

confidence: 99%

Solubility of Solids in Near-Critical Conditions: Effect of a Third Component

2008

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The effect of cosolvents on the solubility equilibria near the critical end-point of binary mixtures is analyzed. The problem has received recent attention for the particular case of ionic cosolvents (Mazo, R. M. J. Phys. Chem. B 2007, 111, 7288-7290), where a pronounced salting-out effect was predicted. Here we make a thermodynamic analysis to view the problem from a different perspective. Our conclusions are that, at the critical end-point, the Setchenov constant, which reflects the effect of cosolvents on solubility equilibria, diverges following the behavior of the osmotic susceptibility and that the sign of this divergence is encoded in the critical end-line of the ternary system.

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The effect of the addition of water, propane, or docosane on the vapour–liquid and solid–fluid equilibria in asymmetric binary n-alkane mixtures

Cited by 16 publications

References 31 publications

High pressure phase equilibria in methane+waxy systems

High pressure phase equilibria in methane+waxy systems

A New Thermodynamic Model for Paraffin Precipitation in Highly Asymmetric Systems at High Pressure Conditions

Solubility of Solids in Near-Critical Conditions: Effect of a Third Component

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