Three phase equilibria in the binary systems ethane-n-docosane and ethane-n-octacosane

Rodrigues, Allan B. J.; Kohn, James P.

doi:10.1021/je60033a008

Cited by 31 publications

(9 citation statements)

References 3 publications

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“…LLV immiscibility is seen in mixtures of ethane + n -paraffins ranging from n-octadecane to n-pentacosane (5)(6)(7)(8)(9)(10)(11)(12). For carbon numbers 18-23, the LLV extends from a lower critical end point L=L-V (LCEP) to an upper critical end point L-L=V (type K point), in the same manner as methane + n -hexane.…”

Section: Introductionmentioning

confidence: 97%

Partial miscibility behavior of the methane + ethane + n-docosane and the methane + ethane + n-tetradecylbenzene ternary mixtures

Jangkamolkulchai¹,

Luks²

1989

J. Chem. Eng. Data

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The llquid-llquld-vapor (LLV) partial miscibility behavior of the mixtures methane + ethane + n-docosane and methane + ethane + n -tetradecylbenzene is experimentally studied by use of a visual cell (stoichiometric) technique. Phase compositions and molar volumes of the three fluid phases In equilibrium are reported as functions of temperature and pressure within the regions. Also presented are LLV phase equilibria data for the binary system ethane + n -tetradecylbenzene. The two ternary systems have constituent binary mixtures that exhibit LLV partial miscibility. In pressure-temperature space, the addition of the third component, methane, promotes growth of the three-phase LLV region from the binary LLV locus toward the vapor pressure curve of methane. The three-phase regions of both ternary systems are bounded from above by an upper critical end point (L-L=V) locus, from below by a lower critical end point (L=L-V) locus, and at low temperatures by a four-phase (SLLV) locus.

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Section: Introductionmentioning

confidence: 97%

Partial miscibility behavior of the methane + ethane + n-docosane and the methane + ethane + n-tetradecylbenzene ternary mixtures

Jangkamolkulchai¹,

Luks²

1989

J. Chem. Eng. Data

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“…A total of 457 data points of WDT in binary asymmetric mixtures are used for evaluations. In this study the WDT data of asymmetric systems for which the data are not reported at high pressures of at least 50 MPa (e.g., − for which the solid–fluid phase boundary data are reported up to 12 MPa), or the systems for which the uncertainty in the critical/physical properties of the heavy end component is high (e.g., ref ) are not used in evaluations. In all the systems evaluated wax phase boundary data in low to very high proportions of methane with a variety of molar ratios were measured.…”

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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“…All of the present results are for 200 bar. Water properties used In the calculations were derived from the equation of state of Haar et al (6), while the densities of KCI solutions at 298.15 K and 200 bar were obtained from the fit of Gates and Wood (7). The error estimates given in Table I were calculated from our sensitivity limit in determining Ps/Pw, typically ±0.000 15, and an accuracy of ±1% in the measurement of (Ps -Pw)/Pw and of the correction factor, f. Calculations Review of Equations.…”

Section: Resultsmentioning

confidence: 99%

“…LLV immiscibility is seen in mixtures of ethane + n -paraffins ranging from -octadecane to n-pentacosane (5)(6)(7)(8)(9)(10)(11)(12). For carbon numbers 18 to 23 , the LLV locus extends from a lower critical end point L=L-V (LCST) to an upper critical end point L-L=V (type K point), in the same manner as methane + nhexane.…”

Section: Introductionmentioning

confidence: 97%

Partial miscibility behavior of the ethane + propane + n-dotriacontane mixture

Estrera¹,

Luks²

1988

J. Chem. Eng. Data

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The llquld-llquld-vapor partial miscibility of the mixture ethane + propane + n-dotrlacontane Is experimentally studied by using a visual cell (stoichiometric) technique. The ternary mixture, which has no constituent binary partial miscibility, has a llquld-llquld-vapor region bounded by upper and lower critical end point loci and a quadruple point locus (solld-llquld-llquld-vapor). The three-phase region extends from about 47 to 95 °C at pressures from 41 to 52 bar. The boundaries of the three-phase region are located In pressure-temperature space, and phase compositions and molar volumes of the three fluid phases are reported along Isotherms at 50, 60, and 70 °C.

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Three phase equilibria in the binary systems ethane-n-docosane and ethane-n-octacosane

Cited by 31 publications

References 3 publications

Partial miscibility behavior of the methane + ethane + n-docosane and the methane + ethane + n-tetradecylbenzene ternary mixtures

Partial miscibility behavior of the methane + ethane + n-docosane and the methane + ethane + n-tetradecylbenzene ternary mixtures

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

Partial miscibility behavior of the ethane + propane + n-dotriacontane mixture

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