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Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA)
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Thermodynamic study of (anthracene + benzo[a]pyrene) solid mixtures.

James W Rice1, Eric M Suuberg

  • 1Brown University Division of Engineering, 182 Hope Street Box D, Providence, RI USA 02912, 401-863-2775 (p) 401-863-9120 (f).

The Journal of Chemical Thermodynamics
|September 4, 2010
PubMed
Summary

This study characterizes the thermodynamic behavior of anthracene and benzo[a]pyrene mixtures. A eutectic point was identified, revealing amorphous solid behavior and influencing fusion enthalpy for various compositions.

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Area of Science:

  • Physical Chemistry
  • Materials Science

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are crucial in various industrial and environmental processes.
  • Understanding the thermodynamic properties of PAH mixtures is essential for predicting their behavior and applications.

Purpose of the Study:

  • To investigate the phase behavior and thermodynamic properties of the binary mixture of anthracene and benzo[a]pyrene.
  • To map the solid-liquid phase diagram and determine the eutectic point and its characteristics.

Main Methods:

  • Thermochemical experiments
  • Vapor pressure measurements
  • Solid-liquid phase diagram mapping
  • Solid-vapor equilibrium studies

Main Results:

  • A solid-liquid phase diagram for the anthracene + benzo[a]pyrene system was established.
  • A eutectic point was identified at x(anthracene) = 0.26, forming an amorphous solid melting between 414–420 K.
  • The enthalpy of fusion for mixtures (0.10 < x(anthracene) < 0.90) is primarily dictated by the eutectic.
  • Solid-vapor equilibrium studies indicated that low concentrations of anthracene do not significantly affect benzo[a]pyrene's sublimation behavior.

Conclusions:

  • The thermodynamic behavior of anthracene-benzo[a]pyrene mixtures is significantly influenced by the eutectic composition.
  • Anthracene has a limited impact on the solid-vapor equilibrium of benzo[a]pyrene at lower concentrations.