Sonic speed and critical point measurements in ethane by the acoustic resonance method

Colgate, S. O.; Sivaraman, A.; Dejsupa, C.

doi:10.1016/0378-3812(92)85086-n

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…6,7 Acoustic methods have a long history. A brief review of acoustic measurements was made in ref 6. Notable previous work includes Moldover, 8 Colgate 9 and Johnson 10 and references therein. Our method is quite crude but gives satisfactory critical data for pure and binary systems, 6 where critical temperatures were measured with an accuracy of (0.1 K and critical pressures with (0.1 bar.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems

Kordikowski¹,

Robertson²,

Poliakoff³

et al. 1997

J. Phys. Chem. B

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A simple acoustic method has been used to investigate the two ternary systems CO2 + CH2F2 + CF3CH2F and CO + C2H4 + CH3CHCH2. Vapor−liquid equilibria data were measured for four of the six binary subsystems as well as the two ternary systems. The binary systems containing either CO2 or a refrigerant (CH2F2, CF3CH2F) have been investigated over the whole mole fraction range. For the subsystems containing CO, only the range from 0 to 40 mol % CO could be investigated. The ternary systems were measured by the quasibinary method (i.e. the ratio between two components being held constant). For the system CO2 + CH2F2 + CF3CH2F, three different quasibinary mixtures, with three different compositions each, were measured. For the ternary system CO + C2H4 + CH3CHCH2, one quasibinary mixture with three different compositions was investigated. Additionally, two specific mixtures were investigated in the ternary system CO + C2H4 + CH3CHCH2, because of the importance of this system in the synthesis of aliphatic polyketone polymers. For each mixture the critical point was determined. Different ways of presenting binary and ternary critical data and the topology of the resulting ternary critical surfaces are discussed with respect to thermodynamics. Some limitations of the acoustic method for probing phase behavior are explained The critical data have been modeled using the Peng−Robinson equation of state.

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Section: Introductionmentioning

confidence: 99%

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems

Kordikowski¹,

Robertson²,

Poliakoff³

et al. 1997

J. Phys. Chem. B

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“…However, these investigations were usually aimed at obtaining thermodynamic properties rather than critical data. In the 1980s, extensive investigations began to measure critical properties via acoustic methods. − In the majority of this work, a spherical acoustic cavity was used as a resonator, because its geometry leads to standing acoustic waves in the cavity. Therefore, the signal-to-noise ratio is superior to other geometries.…”

Section: Introductionmentioning

confidence: 99%

Probing Vapor/Liquid Equilibria of Near-Critical Binary Gas Mixtures by Acoustic Measurements

et al. 1996

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Phase behavior is a fundamental aspect of supercritical fluids. A simple acoustic method is described for investigating vapor/liquid equilibria. The method is used to investigate three different pure components (CO2, C2H6, and CF3CH2F, refrigerant R134a) and binary mixtures of CF3CH2F with CO2 or C2H6. For the pure components, the reciprocal of the speed of sound was measured at selected temperatures around the critical point. The data obtained are in good agreement with literature values. The binary mixtures were investigated over the whole composition range (i.e., mole fraction of CF3CH2F from 0 to 1.0), and their critical curves were determined. The critical lines show the expected type I fluid phase behavior, but the critical line in C2H6 + CF3CH2F shows an unusual pressure minimum and maximum. The resulting critical lines are discussed with respect to thermodynamics, the use of these mixtures for supercritical fluid chromatography and extractions, and the possibility of using CF3CH2F as a modifier.

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“…Boyes [11], Colgate et al [12], and Estrada-Alexanders and Trusler [9] measured speeds of sound in the gas region with a spherical resonator. The data sets of Trusler and Costa Gomez [3] and Terres et al [13] also cover parts of the gas region and overlap with our data at low pressures at supercritical temperatures.…”

Section: Resultsmentioning

confidence: 99%

Measurements of the speed of sound in liquid and supercritical ethane

Hawary

Meier

2016

Fluid Phase Equilibria

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Comprehensive and accurate measurements of the speed of sound in pure ethane have been carried out in the liquid and supercritical regions by a double-path-length pulse-echo technique. The measured data cover the temperature range from 240 K to 420 K with pressures up to 100 MPa. The expanded measurement uncertainties at the 95 % confidence level amount to 2.1 mK for temperature, 0.007 % for pressure, and 0.01 % for speed of sound with the exception of a few state points in the vicinity of the critical point, where the uncertainty increases up to 0.016 %. The quality of the measurements is demonstrated by comparisons with literature data and the fundamental equation of state for ethane

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Sonic speed and critical point measurements in ethane by the acoustic resonance method

Cited by 16 publications

References 18 publications

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems

Probing Vapor/Liquid Equilibria of Near-Critical Binary Gas Mixtures by Acoustic Measurements

Measurements of the speed of sound in liquid and supercritical ethane

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Sonic speed and critical point measurements in ethane by the acoustic resonance method

Cited by 16 publications

References 18 publications

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO2 + CH2F2 + CF3CH2F and CO + C2H4 + CH3CHCH2 and in Their Binary Subsystems

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO2 + CH2F2 + CF3CH2F and CO + C2H4 + CH3CHCH2 and in Their Binary Subsystems

Probing Vapor/Liquid Equilibria of Near-Critical Binary Gas Mixtures by Acoustic Measurements

Measurements of the speed of sound in liquid and supercritical ethane

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Product

Resources

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Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems

Acoustic Determination of the Critical Surfaces in the Ternary Systems CO₂ + CH₂F₂ + CF₃CH₂F and CO + C₂H₄ + CH₃CHCH₂ and in Their Binary Subsystems