Volumetric Behavior of Isopentane

Isaac, R. J.; Li, Kun; Canjar, Lawrence N.

doi:10.1021/ie50529a059

Cited by 22 publications

(12 citation statements)

References 3 publications

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“…The bellows variable volumometer results by Isaac et al [3] exhibit systematic deflection with larger deviation, within ±0.6 %. Our results still show a small deviation of within ±0.12% in density at this temperature range.…”

Section: Discussionmentioning

confidence: 73%

“…For ρ′, our results are also in good agreement with those of Gallagher et al [15] and Holcomb et al [16] [14] for isopentane). •, this work; ◇, Young and Thomas [1]; □, Bridgman [2]; ＊, Isaac et al [3]; +, Silberberg et al [4]; △, Mopsik [6]; ×, Houck and Heydemann [7,8]. MPa from the Lemmon-Span model (REFPROP ver.9.1 [14] for isopentane).…”

Section: Discussionmentioning

confidence: 99%

“…Bridgman [2] measured 32 points of reliable PρT data from 273 to 368 K at higher pressures of up to 883 MPa using a bellows variable volumometer in 1931. Isaac et al [3] measured 108 points of PρT data at higher temperatures of 373 to 573 K at up to 22 MPa using a bellows variable volumometer in 1954. Silberberg et al [4] …”

Section: Introductionmentioning

confidence: 99%

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PρT and saturation properties of isopentane at T= (280–440) K and up to 200 MPa

Matsumoto

Miyamoto

2016

The Journal of Chemical Thermodynamics

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

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PρT and saturation properties of isopentane at T= (280–440) K and up to 200 MPa

Matsumoto

Miyamoto

2016

The Journal of Chemical Thermodynamics

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“…There are large discreprencies among the available data in the supercritical region. The apparent systematic deviations in the data of Isaac et al (1954) are unfortunate, since the data extend up to 573 K, but cannot be used to evaluate the accuracy of the equation. The data of Isaac et al were not used during fitting, and the final equation relied on the data of Silberberg et al (1959) at lower pressures and on the data of Vohra and Kobe (1959) at higher pressures.…”

Section: Enthalpy Differencesmentioning

confidence: 99%

Short Fundamental Equations of State for 20 Industrial Fluids

2006

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In a preceding project, functional forms for "short" Helmholtz energy equations of state for typical nonpolar and weakly polar fluids and for typical polar fluids were developed using simultaneous optimization. In this work, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide, 2-methylbutane (isopentane), 2,2-dimethylpropane (neopentane), 2-methylpentane (isohexane), krypton, nitrous oxide, nonane, sulfur dioxide, toluene, xenon, hexafluoroethane (R-116), 1,1-dichloro-1-fluoroethane (R-141b), 1-chloro-1,1-difluoroethane (R-142b), octafluoropropane (R-218), 1,1,1,3,3-pentafluoropropane (R-245fa), and fluoromethane (R-41). The 12 coefficients of the equations of state were fitted to substance specific data sets. The results show that simultaneously optimized functional forms can be applied to other fluids out of the same class of fluids for which they were optimized without significant loss of accuracy. The high numerical stability of the functional forms resulted in successful fits for fluids that previously could not be described by accurate empirical equations of state. For R-41, it is shown that the accuracies can be increased further by fitting the temperature exponents in addition to the coefficients of the equation of state, provided that highly accurate experimental data are available. Typical uncertainties of properties calculated using the new equations are 0.2 % in density, 1 % to 2 % in heat capacity and liquid-phase speed of sound, and 0.2 % in vapor pressure. Where data are available, uncertainties in vapor-phase sound speeds are generally less than 0.1 %.

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“…Separate charges of isopentane were used for each measurement. The observed vapor pressures were correlated and smoothed graphically by a residual technique and compared (Table I) with those values reported by Isaac, Li, and Canjar (6) and with values similarly smoothed from Young's data (20). The total maximum uncertainty in these vapor pressures including that portion corresponding to the temperature uncertainty, is estimated not to exceed 0.25%.…”

mentioning

confidence: 99%