The Vapor Pressures and Enthalpies of Sublimation of Five Polycyclic Aromatic Hydrocarbons

Murray, J.; Pottie, R. F.; Pupp, C.

doi:10.1139/v74-087

Cited by 101 publications

(59 citation statements)

References 4 publications

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“…Group sum C p,m (l) (17) 153.1 (18) Eicosane 169.3 ± 0.7 170.4 (17) Phenanthrene 91.2 91.3 ± 2.7 (11) Perylene 138.1 ± 6.2 137.2 ± 5.9 (19) 126.8 (20) 145.4 ± 2.5 (21) 144.1 (22) 134.6 ± 5.4 (23) Coronene >144 141 ± 10.5 (19) 143.2 (20) 138.9 (25) 155.3 (22) 154.7 (23) 144.1 ± 6.9 (24) Corannulene 118.3 ± 3.3…”

Section: Resultsmentioning

confidence: 99%

The enthalpy of vaporization and sublimation of corannulene, coronene, and perylene at T= 298.15 K

Chickos

Webb

Nichols

et al. 2002

The Journal of Chemical Thermodynamics

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Section: Resultsmentioning

confidence: 99%

The enthalpy of vaporization and sublimation of corannulene, coronene, and perylene at T= 298.15 K

Chickos

Webb

Nichols

et al. 2002

The Journal of Chemical Thermodynamics

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“…Equation {B5} has been successfully utilized to calculate equilibrium vapor pressures of organic compounds by many workers [Morecroft, 1964;Wiedemann, 1972;DePablo, 1976;DeKruif, 1980;Colomina et al, 1980;Colomina et al, 1982;Kelley and Rice, 1964;Murray and Pottie, 1974]. As was noted above, the steady state pressure P ss may be expected to be slightly less than equilibrium pressure P eq .…”

Section: B423 Implementation Of the Methodmentioning

confidence: 99%

Vapor Pressures and Heats of Vaporization of Primary Coal Tars

Suuberg¹,

Oja²

1997

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Executive SummaryThis project had as its main focus the determination of vapor pressures of coal pyrolysis tars. It involved performing measurements of these vapor pressures and from them, developing vapor pressure correlations suitable for use in advanced pyrolysis models (those models which explicitly account for mass transport limitations).This report is divided into five main chapters. Each chapter is a relatively "stand-alone" section. Chapter A reviews the general nature of coal tars and gives a summary of existing vapor pressure correlations for coal tars and model compounds. It is shown that the heterogeneous nature and the complexity of coal tars have made it unrealistic to apply detailed vapor pressure correlations which take into account the variation in the chemical structure of the tars. The significant product of this study is a much improved understanding of the volatility and thermal behavior of coal tars. The volatility was studied by vacuum sublimation and Knudsen effusion experiments. The volatility behavior is considerably more complicated than had been earlier believed.The tars evaporate in a "distillation-like" fashion. More volatile species are lost earlier in the process, leaving behind a progressively less volatile residue. The results suggest that there are three very different classes of compounds, and therefore, at least three different vapor pressure behaviors. The first corresponds to compounds of high molecular weight and significant alkyl character, the second to compounds with significant hydroxyl group content and medium molecular weight, and the third to medium molecular weight aromatic compounds without hydroxyl groups. Hydrogen bonding plays a major role in the determining the tar volatility. vi There has been concern in pyrolysis modeling about how closely Raoult's law is followed in coal tar. It appears from our results that the assumption of ideal mixture behavior could be acceptable for rough models of pyrolysis despite the possibility of strong specific interactions between certain functional groups.The results from the current work show that measuring the vapor pressures of complicated and thermally unstable mixtures is possible at low temperatures. There has also been some concern about condensation-type reactions influencing the results of vapor

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“…This could be applicable in the case of high diurnal temperature deviations also. Murray et al (1974) showed that for a temperature change of 20°C there is approximately an order of magnitude change in the vapour pressure of PAHs.…”

Section: Meteorology and Deposition Of Pahsmentioning

confidence: 99%

Atmospheric Bulk Deposition of PAHs over Brahmaputra Valley: Characteristics and Influence of Meteorology

Hussain

Rahman

Prakash

et al. 2016

Aerosol Air Qual. Res.

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Bulk atmospheric deposition of Polycyclic Aromatic Hydrocarbons (PAHs) in Guwahati city of the Brahmaputra Valley have been characterised for a period of one year. The ∑PAHs (USEPA's priority 16) and benzo(s)pyrene (BaP) concentrations in the collected bulk deposit ranged between 2.2 and 1035 ng mL -1 , and BDL and 5.6 ng mL -1 respectively. Greater deposition of PAHs was observed during the dry season and the deposition of low molecular weight PAHs (LMWPAHs) were particularly high. The study revealed explicit effect of the prevailing meteorology on the bulk atmospheric deposition characteristics of PAHs. Greater number of inversion days and lowering of inversion height during the dry season were found to enhance deposition of PAHs. Diagnostic ratios indicated pyrogenic origin of the PAHs derived from combustion of diesel, coal and wood combustion. The deposition of LMWPAHs was greatly influenced by temperature. The diurnal variation of relative humidity, and wind pattern were found to affect deposition of PAHs.

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The Vapor Pressures and Enthalpies of Sublimation of Five Polycyclic Aromatic Hydrocarbons

Cited by 101 publications

References 4 publications

The enthalpy of vaporization and sublimation of corannulene, coronene, and perylene at T= 298.15 K

The enthalpy of vaporization and sublimation of corannulene, coronene, and perylene at T= 298.15 K

Vapor Pressures and Heats of Vaporization of Primary Coal Tars

Atmospheric Bulk Deposition of PAHs over Brahmaputra Valley: Characteristics and Influence of Meteorology

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