The Normal Boiling Point and Critical Constants of Normal Heptane

Beattie, James A.; Kay, William C.

doi:10.1021/ja01288a002

Cited by 27 publications

(13 citation statements)

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“…The impurities in the methane were reported to be ethane, nitrogen, and carbon dioxide. The methane was passed through a silica gel drying tube at 1,500 Ib./sq. in.…”

Section: Methodsmentioning

confidence: 99%

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Heterogeneous phase and volumetric behavior of the methane n‐heptane system at low temperatures

Kohn

1961

AIChE Journal

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A, reactor, sq.cm. a unit of volume, cm.-l C = concentration, moles/liter D = molecular diffusivity, sq.cm./ f = fractional acid conversion, dik = first-order reaction velocity L = bed height n = number of spheres MI = cross-sectional area of empty = packed bed surface area per sec. mensionless constant = mass flux rate for a single reacting sphere, moles/sq.cm-superficial velocity, dimensionless = molar concentration of surface active sites = over-all rate of reaction, moles/liter sec. = interfacial condition = time = time-of-flight (difference between the observed time for the start of concentration fall off at the exit of the bed and the inlet to the bed) = linear velocity based on free 2. 3. 4. 5. 6. .cross section, cm./sec. 8. 9.Greek Letters 8 = boundary-layer thickness, cm. 10. E o = dimensionless time ratio, to/ A = constant 8 = time = fraction voids in beds 11. t f Subscripts 12. f = bulk fluid condition 13. e = exit condition i = inlet condition m = mean value across the bed 14.

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“…The impurities in the methane were reported to be ethane, nitrogen, and carbon dioxide. The methane was passed through a silica gel drying tube at 1,500 Ib./sq. in.…”

Section: Methodsmentioning

confidence: 99%

“…Mixtures of methane and n-heptane have been studied by Boomer (1,2) who studied mixtures which contained small amounts of nitrogen at pressures up to 3,000 lb./sq. in.…”

Section: Page 514mentioning

confidence: 99%

Heterogeneous phase and volumetric behavior of the methane n‐heptane system at low temperatures

Kohn

1961

AIChE Journal

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“…where n is an empirical constant and X= Vc/V, the reduced density, has been shown to fulfill the requirements at the critical state and to 10 W. E . Deming and L. S. Deming, Phys.…”

Section: Discussionmentioning

confidence: 98%

An equation for the isotherms of pure substances at their critical temperatures

Meyers¹

1942

J. RES. NATL. BUR. STAN.

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An"empirical· equation"is presentedJor-data-along the isotherms of pure substances at their critical temperatures and densities up to 1.1 times the critical density. The equation has five constants in addition to the universal gas constant. Of these five, one is limited to a single value, if a simple solution to the equation is to be obtained; three are determined by the critical conditions; and the remaining constant is determined empirically from data other than those for the critical state.

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“…This boundary condition of Plank and Riedel (1948) is not shared by Goodwin (1969) who suggests that ( d 2 P / d T Z ) , ma be unbounded. In this connection, Zia and Thodos (19'747 have utilized the high vapor pressure data of Beattie and Kay (1937), Kay (1938), and Young (1898) for n-heptane in order to verify the practical involvement of this Riedel-Plank condition at the critical state. The treatment by Zia and Thodos (1974) shows that a plot of log PR vs. log T R becomes linear in the neighborhood of the critical point, indicating that the Riedel-Plank boundary condition appears to be applicable.…”

Section: (3)mentioning

confidence: 99%

Generalized vapor pressure behavior of substances between their triple points and critical points

Gomez-Nieto

Thodos

1977

AIChE Journal

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Several approaches are utilized for the estimation of the parameters associated with the normalized vapor pressure equation to develop a capability for the prediction of vapor pressures consistent with the theorem of corresponding states. In this development, conditions and restrictions associated with the critical point and the normal boiling point were used to establish the vapor pressure parameters a, p, y, and m. For the evaluation of these parameters, five different approaches were applied, and vapor pressures calculated with each of them were compared with corresponding experimental values presented in the literature. These comparisons were further examined using the results of four other well-known vapor pressure equations available in the literature. This evaluation included 138 substances of all types and involved a total of 7,633 literature reported vapor pressure values to show that improved results are possible through the involvement of the generalized vapor pressure equation of this investigation. SCOPEThe perennial involvement of the vapor pressure behavior of substances makes it mandatory that simple and exacting relationships be established that are capable of predicting vapor pressures over the complete liquid region included between the triple point and the critical point of a substance. In this context, a generalized vapor pressure equation, consistent with the theorem of corresponding states, has been examined and tested to show that improved results are possible with it. The capabiIity of this generalized relationship permits the calculation of vapor pressures that find use in vapor-liquid equilibria of both simple and complex mixtures, the estimation of latent heats of vaporization over the complete liquid range, and thermodynamic properties associated with the saturated vapor-liquid state. In addition, the analysis associated with this study constitutes a basis for evaluating parameters that find use in the application of the theorem of corresponding states for both gases and liquids. CONCLUSIONS A N D SIGNIFICANCEAverage percent deviations resulting from the use of in the literature. The capability of the vapor pressure this generalized vapor pressure equation are smaller than equation examined in this study has been extensively those obtained from corresponding relationships available tested using 138 substances and involving a total 7 633 vapor pressure values reported in the literature. One of y Technologia, Mbxico. the proposed schemes for estimating the vapor pressure

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The Normal Boiling Point and Critical Constants of Normal Heptane

Cited by 27 publications

References 0 publications

Heterogeneous phase and volumetric behavior of the methane n‐heptane system at low temperatures

Heterogeneous phase and volumetric behavior of the methane n‐heptane system at low temperatures

An equation for the isotherms of pure substances at their critical temperatures

Generalized vapor pressure behavior of substances between their triple points and critical points

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