Construction of phase diagrams to estimate phase transitions at high pressures: A critical point at the solid liquid transition for benzene

İbrahimoğlu, Beycan; Üner, Deniz; Veziroğlu, Ayfer; Karakaya, Fuat

doi:10.1016/j.ijhydene.2021.02.010

Cited by 13 publications

(4 citation statements)

References 47 publications

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“…In this study, liquid benzene with a mass purity of 99.5% and a density of 0.787 g/cm 3 under standard conditions was selected as the material. A specially designed and constructed experimental apparatus was used to determine the freezing thermograms of cooled liquids at increasingly higher and constant pressures and temperatures [35][36][37]. A certain pressure is applied to 10 mL of liquid benzene placed in the freezing cell of the device and its temperature is raised to a constant value by heating.…”

Section: Methodsmentioning

confidence: 99%

Liquid-solid Equilibrium Position and Critical Point for Benzene

Sarıkaya¹,

Önal²,

İbrahimoğlu³

2023

JEPES

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Using a specially constructed experimental apparatus, the freezing thermograms of benzene at increasingly higher constant pressures and temperatures were determined. The isotherm reversible freezing of liquid benzene, which metastabilizes irreversibly through super cooling and isentalpic transformation steps, is studied in detail. In addition to the temperature and pressure changes, it was determined that the step times decreased rapidly due to increasing pressure and temperature and reached zero. Where these quantities are zero, 356 K and 2230 bar are considered as the temperature and pressure of the critical point of the liquid-solid equilibrium line, respectively. The liquid-solid equilibrium line for the variation of pressure with temperature between this critical point and the triple point is precisely determined. A pressure-temperature phase diagram with the critical point and this test line is arranged for benzene. The irreversible metastabilization of liquid benzene has been studied thermodynamically. It has been determined that enthalpy, entropy, volume and internal energy changes and work done on the system decrease rapidly with temperature and pressure as they gradually increase and approach zero at critical values.

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Section: Methodsmentioning

confidence: 99%

Liquid-solid Equilibrium Position and Critical Point for Benzene

Sarıkaya¹,

Önal²,

İbrahimoğlu³

2023

JEPES

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“…ii. There is a unique temperature where V = 0 for all substances, for all pressures Applying the (ρ-T), p = constant dependency to gases, the point where the isobars intersect on T axis indicates the ionization temperature of monatomic gases 9,11,22,24 .…”

Section: Determination Of the Critical Point With Thermodynamic Geometrymentioning

confidence: 99%

“…Boundary of the liquid phase, location of plasma and the ionization zone for benzene drawn accordingly is as shown in Fig. 6 24,25,34,35 .…”

Section: Sublimation Equilibrium Curvementioning

confidence: 99%

Critical Parameters of Pure Substances

İbrahimoğlu

Sarıkaya

Ibrahim

2022

Preprint

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Solid, liquid, gas and plasma phases of pure substances were being studied in detail for over a century. There are liquid-solid, liquid-vapor and solid-vapor thermodynamic equilibrium curves on the conventional p-T phase diagram. However, location of the plasma phase, liquid-solid, solid-vapor equilibrium curves and critical parameters limiting those equilibriums are not provided since they haven’t yet been measured experimentally. Determination of the absent equilibrium curves, critical parameters, and the thermodynamic conditions for plasma phase occurrence with its location on the phase diagram were set to be the purpose of this study.

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“…Phase diagrams of mixtures of benzene and acetonitrite have been obtained [31]. Very recently, the P-T phase diagram has been constructed to determine the solid, liquid and gaseous states for benzene [32]. Phase transitions in liquid benzene (solid-liquid transition) has been studied by using high-resolution time-resolved Raman spectroscopic technique [33].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Entropy and the Heat Capacity Calculated from the Raman Frequency Shifts for Solid Benzene, Naphthalene and Anthracene

Yurtseven

Ozdemir

2022

International Journal of Thermodynamics

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Temperature dependences of the free energy (F), entropy (S) and the heat capacity (C_v) are calculated (P=0) for the organic compounds (solid benzene, naphthalene and anthracene) by using the quasiharmonic approximation. Contributions to those thermodynamic functions due to the Raman frequencies of lattice modes (solid benzene), librational modes (naphthalene), phonons and vibrons (anthracene) are taken into account in our calculations. We obtain that similar linear increase of F and nonlinear increase of S and C_v, occur with the increasing temperature in benzene and naphthalene. This linear (F) and nonlinear (S, C_v) increase is rather different for anthracene as the molecular structure becomes complex (benzene-naphthalene-anthracene), as expected. Our calculations by the quasiharmonic approximation can be compared with the experiments for those organic compounds.

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Construction of phase diagrams to estimate phase transitions at high pressures: A critical point at the solid liquid transition for benzene

Cited by 13 publications

References 47 publications

Liquid-solid Equilibrium Position and Critical Point for Benzene

Liquid-solid Equilibrium Position and Critical Point for Benzene

Critical Parameters of Pure Substances

Temperature Dependence of the Entropy and the Heat Capacity Calculated from the Raman Frequency Shifts for Solid Benzene, Naphthalene and Anthracene

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