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Thermodynamic study of (anthracene + phenanthrene) solid state mixtures.

James W Rice¹, Jinxia Fu¹, Emma Sandström¹

¹Brown University School of Engineering, 184 Hope Street Box D, Providence, RI 02912, USA.

The Journal of Chemical Thermodynamics

|March 15, 2016

Summary

Polycyclic aromatic hydrocarbons (PAH) mixtures show non-ideal thermodynamic behavior. Understanding PAH phase behavior is crucial for predicting environmental fate and industrial processes.

Keywords:

Anthracene Binary mixtures Phase equilibria Phenanthrene Polycyclic aromatic hydrocarbons Vapor pressure

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Area of Science:

Thermodynamics
Environmental Chemistry
Materials Science

Background:

Polycyclic aromatic hydrocarbons (PAH) are prevalent in petroleum and tars, occurring naturally and from fuel processing.
Understanding the thermodynamic properties of PAH mixtures is vital for predicting their environmental fate and industrial behavior.
PAHs are common environmental contaminants and industrial process components.

Purpose of the Study:

To investigate the thermodynamic phase behavior of binary PAH mixtures.
To characterize the non-ideal mixture behavior of anthracene and phenanthrene.
To provide data for better prediction of PAH behavior in environmental and industrial settings.

Main Methods:

Differential scanning calorimetry (DSC)
X-ray diffraction (XRD)
Knudsen effusion technique

Main Results:

Anthracene-phenanthrene mixtures exhibit non-ideal behavior.
A phenanthrene-rich phase forms with a melting point of 372 K.
Azeotrope-like and quasi-azeotropic behavior were observed in specific mixture compositions.

Conclusions:

The study elucidates the complex phase behavior of anthracene-phenanthrene mixtures.
Observed non-ideal and azeotrope-like behaviors are critical for accurate environmental and industrial modeling.
Anthracene can incorporate low concentrations of phenanthrene into its crystal structure.