Enthalpies of benzene and mixtures of benzene with n-octane

Lenoir, John M.; Hayworth, Kenneth E.; Hipkin, Howard G.

doi:10.1021/je60050a034

Cited by 18 publications

(7 citation statements)

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“…During the time period of approximately four years' operation of the calorimeter, the measurement accuracy has not declined, and an expectation of an accuracy of 1.5 Btu/lb is considered justified. Enthalpy values have already been presented for the pure components, benzene and pentane, as discussed (7,8). At the outset of this present study, it was believed that no previous enthalpy measurements had been made on the benzenejournal of Chemical and Engineering Data, Vol.…”

Section: Literature Citedmentioning

confidence: 72%

“…This experimental study reports the calorimetric measurements of four mixtures of benzene with n-pentane, a paraffin of lower boiling point and molecular weight than benzene. This present work complements an earlier study of benzene and n-octane mixtures (7). The measurements were made with a flow calorimeter that operates isobarically and measures the enthalpy difference relative to 75°F and the pressure of measurements.…”

Section: Literature Citedmentioning

confidence: 84%

“…( 6) Farr, T. D., Williard, J. W., Hatfield, J. D., ibid., 17, 313 (1972). (7) Griffith, E. J., J. Inorg. Nucí.…”

Section: Literature Citedmentioning

confidence: 99%

“…In addition, Table I shows the enthalpy needed to convert the measurements relative to 75°F in the saturated liquid condition to the enthalpy basis of -200°F recommended by the API data book (1). This conversion number for pure benzene was established (7) as 88.1 Btu/lb, For the mixtures, the conversion number is the weight average of the pure component values plus the heat of mixing. An additional correction was made to the calorimeter measurements to account for the change in enthalpy with increasing pressure at 75°F in the liquid phase.…”

Section: Literature Citedmentioning

confidence: 99%

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Measured enthalpies for mixtures of benzene with n-pentane

Lenoir¹,

Hipkin²

1972

J. Chem. Eng. Data

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selected to facilitate comparison of the total fertilizer nutrient contents, N + PZO5, of the saturated solutions in the several systems.The 0°C isotherm of the multiphosphate system over the pH range studied comprises three branches representing solutions saturated, respectively, with (KH4)2HP04, (NH4)4PzO'i 9 HzO, and h H4H2P04, (NH4)3HP207. H 2 0 , (NH4)5P3010. 2H20, and ("4)6P4013.2H20.Only one invariant solution was determined. It was saturated with (NH4)2HP04, (NH4)3HPO?. H20, (NH4)4P207. HzO, (NH4)5P3O1o.2H2OJ and (NH4)d'4013. 2H20, and contained 12.61% N and 41.04% P z O~ distributed as ortho-21, pyro-35, tripoly-14, and tetrapolyphosphate 29%. It had a pH of 6.39, a value near that (6.50) of the invariant solution of the ternary system N H~H~P z O~-H Z O saturated with tri-and tetraammonium pyrophosphate and near that (6.44) of the invariant solution of the quaternary system NH3-H3P04-H4P207-H20 saturated with tri-and tetraammonium pyrophosphates and diammonium orthophosphate. A second invariant point, representing a solution saturated with XH4H2P04, (KHJzHP04, (NH4)3HP207.HzOJ (NH4)SP3010. H 2 0 , and (NH4)6P4013. 2H20, was estimated from plots of pH vs. N or P205 to contain lh.6% N and 44.2% PZOS and to have a pH of 5.9.As shown in Figure 1, the total fertilizer nutrient contents of the solutions saturated with ammonium ortho-, pyro-, tripoly-, and tetrapolyphosphates are significantly higher than those of solutions with the same ratio N:Pz05 that are saturated with only a single phosphate species. As shown in Figure 2, a t each ratio N : P 2 0 5 , a solution of the six-component system saturated with ammonium ortho-, pyro-, tripoly-, and tetrapolyphosphates has a nutrient content (h' + P205) 510%higher than that of a solution of the five-component system saturated with only ammonium ortho-, pyro-, and tripolyphosphates, and 10-25'% higher than that of a solution of the four-component system saturated with only ammonium orthoand pyrophosphates. The isotherms in Figure 2 will be useful in the preparation of ammonium polyphosphate solutions in the most desirable pH range with maximum fertilizer nutrient contents that will not salt out a t 0°C.A flow calorimeter was used to measure four compositions of benzene with n-pentane between 260' and 7OO0F, with pressures ranging up to 1400 psia.

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Section: Literature Citedmentioning

confidence: 72%

Section: Literature Citedmentioning

confidence: 84%

“…( 6) Farr, T. D., Williard, J. W., Hatfield, J. D., ibid., 17, 313 (1972). (7) Griffith, E. J., J. Inorg. Nucí.…”

Section: Literature Citedmentioning

confidence: 99%

Section: Literature Citedmentioning

confidence: 99%

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Measured enthalpies for mixtures of benzene with n-pentane

Lenoir¹,

Hipkin²

1972

J. Chem. Eng. Data

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“…Since for this mixture, the binary interaction parameter was not known, it was set equal to zero in all cases. In Table 6.13 the results are shown together with those obtained from the Lee-Kesler corresponding-states scheme (see Example 5.3), and the experimental enthalpy difference [20]. In this case, the agreement is not as good as in the previous examples.…”

Section: Benedict Webb and Rubin (Han-starling) Equationmentioning

confidence: 84%

Equations of State

Assael¹,

Trusler²,

Tsolakis³

1996

Thermophysical Properties of Fluids

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A generalized thermodynamic correlation based on three‐parameter corresponding states

1975

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feed to a typical coal processing fluidized bed (Skinner, 1970) ; fine particles in the distribution have a considerable effect on the calculation. Similarly, it is not clear at present exactly how dp should be specified in applying the correlation for jet penetration depth to a bed with a wide range of particle sizes. ACKNOWLEDGMENTThis work was carried out at the Research Laboratories of Westinghouse Electric Corporation and was partially sponsored by the Office of Coal Research. The author wishes to thank Dr. D. L. Keairns for the encouragement and advice he has offered during many useful discussions. NOTATION & = jet nozzle diameter c& = mean particle diameter Db = initial bubble diameter gC L Lo uo = jet nozzle velocity V o = initial bubble volume y, yo Greek Letters 8 = jet half-angle p j = density of fluid pp = density of solids = acceleration due to gavity = volumetric gas flow rate = jet penetration depth measured from nozzle = jet penetration depth measured from apex of cone = length of conical section of jet (yJL = 0.55) = distance between apex of cone and jet nozzle LITERATURE CITED The volumetric and thermodynamic functions correlated by Pitzer and co-workers analytically represented with improved accuracy by a modified B W R equation of state. The representation provides a smooth transition BYUNG IK LEE and MICHAEL G. KESLER between-the original tables of Pkzer et al. aAd more recent extensions to lower temperatures. It is in a form particularly convenient for computer use. Mobi, Research and Development Corporation Post Office Box 1026 Princeton, New Jersey 08540 SCOPE The 3-parameter corresponding states principle as proposed by Pitzer and co-workers has been widely used to correlate the volumetric and thermodynamic properties needed for process design. The original correlations by Pitzer et al., based on that principle, were limited to reduced temperatures above 0.8. Several extensions to lower temperatures have appeared in the last five years. Most of these correlations are in tabular or graphical form, difficult to implement on the computer. Also, significant discrepancies appear at the interface (near T, = 0.8) between the original and extended correlations.The objective of this work was to develop an analytical correlation, based on the 3-parameter corresponding states principle and covering the whole range of T , and P, of practical interest in hydrocarbon processing. Another objeclive was to improve the accuracy and consistency of the published correlations. This has been achieved by means of two equations of state, similar in form to that of Benedict, Webb, and Rubin, for the simple and reference fluids.

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Enthalpies of benzene and mixtures of benzene with n-octane

Abstract: A flow calorimeter has been used to measure the enthalpy of benzene and six mixtures of the benzene-n-octane system. The results are tabulated from 380°to 700°F mixtures, with pressures ranging up to 1400 psia.

Cited by 18 publications

References 7 publications

Measured enthalpies for mixtures of benzene with n-pentane

Measured enthalpies for mixtures of benzene with n-pentane

Equations of State

A generalized thermodynamic correlation based on three‐parameter corresponding states

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