Study of the critical and azeotropic behavior of binary mixtures. 1. Critical states of perfluoromethylcyclohexane-isomeric hexane systems

Genco, J.M.; Teja, Amyn S.; Kay, Webster B.

doi:10.1021/je60087a022

Cited by 20 publications

(8 citation statements)

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“…4 No information is given as to how they were determined. Judging from a comment in another paper by the same group, 6 it is likely that the critical densities were obtained by extrapolating an average of dew-and bubble-point densities. The authors called this a rectilinear diameter.…”

Section: Test Of Methodsmentioning

confidence: 99%

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Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈

Poolen

Holcomb

Rainwater

2001

Ind. Eng. Chem. Res.

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A new, isoplethic method is used to determine critical lines of azeotropic binary fluid mixtures using vapor-liquid equilibrium data including saturated vapor and liquid densities below the lowest critical temperature of the pure components. Thermodynamic paths that access mixture critical lines from this region of the vapor-liquid surface are described by the liquid volume fraction (set at 1 / 2 ), fixed overall composition, and pressure. Data along these paths behave like those for a pure fluid and are extrapolated to the critical line by means of simple, pure-fluidlike expressions for the density difference, vapor pressure, and rectilinear diameter for vapor and liquid in equilibrium. The method is tested successfully for an azeotropic mixture for which critical-point estimates can be compared to those in the literature [C 3 H 8 (propane) + C 4 F 8 (perfluorocyclobutane)]. The method is then applied to the two azeotropic mixtures, R32 [CH 2 F 2 (diflouromethane)] + C 3 H 8 (propane) and R125 [C 2 F 5 H (pentaflouroethane)] + C 3 H 8 (propane), for which no information is available on the critical line. Analytical expressions for the critical temperature, critical pressure, and critical density are given as functions of the overall composition for these mixtures. The combination of relatively easily measured vapor-liquid equilibrium data along with a simple, thermodynamically correct path to the critical line provides an efficient, relatively simple method for characterizing the vapor-liquid coexistence surfaces for binary mixtures.

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Section: Test Of Methodsmentioning

confidence: 99%

“…The critical values in Table 2 are fitted to eqs 6-8 to within less than 0.2, 0.8, and 2.0%, respectively. Table 3 gives the constants for the critical-line representations (eqs [6][7][8] for this mixture.…”

Section: Application Of Methodsmentioning

confidence: 99%

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈

Poolen

Holcomb

Rainwater

2001

Ind. Eng. Chem. Res.

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“…It is found that the absolute deviations between our values and recommended values by NIST are all within the given error range. However, data by NIST in Table is an average of selected values which are measured by previous studies. − These selected values are computed with a certain algorithm and exclude some unavailable values. The relative deviations between our values and the selected values are also calculated and presented in Figure , most of which are within ±0.50% and ±2.00% for T c and p c , respectively.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Critical Properties for Binary and Ternary Mixtures Containing n-Butanol and n-Alkane

et al. 2018

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The critical temperatures (T c) and critical pressures (p c) of five binary mixtures of n-butanol + n-alkane (C = 6, 7, 8, 9, 10) as well as two ternary mixtures (n-butanol + hexane + heptane and n-butanol + heptane + octane) were measured over the whole concentration range using a flow method apparatus. The T c of binary mixtures which contain heptane, octane, and nonane display a significant nonideality. The p c of binary mixtures increase with the increasing mole fraction of n-butanol and p c–x 1 curves rise up more obviously in richer n-butanol regions. The trends of the T c–w 1 curves of two ternary mixtures slightly change with the increasing mass fraction of corresponding n-alkane components in mixtures. By using the Redlich–Kister equations, average absolute deviations (AADs) of binary mixtures were less than 0.09% and 0.31% for T c and p c, respectively. T c and p c of ternary mixtures were correlated using Cibulka’s equations and Singh–Sharma’s equations.

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“…An investigation of the PVT-x relations of a series of binary systems composed of the isomers of hexane with perfluoro- 1 The Ohio State University. * University of Delaware.…”

Section: Introductionmentioning

confidence: 99%

Study of the critical and azeotropic behavior of binary mixtures. 2. PVT-x data and azeotropic states of perfluoromethylcyclohexane-isomeric hexane systems

Genco¹,

Teja²,

Kay³

1980

J. Chem. Eng. Data

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Study of the critical and azeotropic behavior of binary mixtures. 1. Critical states of perfluoromethylcyclohexane-isomeric hexane systems

Cited by 20 publications

References 12 publications

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈

Measurement of Critical Properties for Binary and Ternary Mixtures Containing n-Butanol and n-Alkane

Study of the critical and azeotropic behavior of binary mixtures. 2. PVT-x data and azeotropic states of perfluoromethylcyclohexane-isomeric hexane systems

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Study of the critical and azeotropic behavior of binary mixtures. 1. Critical states of perfluoromethylcyclohexane-isomeric hexane systems

Cited by 20 publications

References 12 publications

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C3H8 and R125 + C3H8

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C3H8 and R125 + C3H8

Measurement of Critical Properties for Binary and Ternary Mixtures Containing n-Butanol and n-Alkane

Study of the critical and azeotropic behavior of binary mixtures. 2. PVT-x data and azeotropic states of perfluoromethylcyclohexane-isomeric hexane systems

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Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures from Subcritical Vapor−Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C₃H₈ and R125 + C₃H₈