Phase equilibrium of asymmetric systems by predictive equations of state models

Orbey, H
Balci, C
Guruz, GA
In this study the modified Wong-Sandler (WS), the modified Huron-Vidal second-order (MHV2), and the Orbey-Sandler (HVOS) mixing rules were used for phase equilibrium correlation of carbon dioxide in n-alkanes, alcohols and water systems. Their correlative and predictive capabilities were compared. In all of these calculations, the Peng-Robinson-Stryjek-Vera (PRSV) equation of state (EOS) was used. It was found that the correlation capacity of the WS mixing rule is better than the HVOS mixing rule. The MHV2 mixing rule failed for highly asymmetric systems, especially in the critical region. The prediction capacities of the WS and HVOS mixing rules, based on the extrapolation of model parameters obtained at the lowest available temperature and pressure to higher values, were found to be acceptable. Also, for carbon dioxide-alkane binaries model parameters were expressed successfully as a function of temperature and the number of carbon atoms in the solvent using the WS mixing rule.


Spectroscopic ellipsometry characterization of PbWO4 single crystals
Delice, S.; Isik, M.; Hasanlı, Nızamı; Darvishov, N.H.; Bagiev, V.E. (2022-09-01)
© 2022 Elsevier B.V.Optical characterization of PbWO4 single crystals grown by Czochralski method was achieved in virtue of spectroscopic ellipsometry experiments carried out in the energy region of 1.0–5.6 eV at room temperature. Tetragonal scheelite structure with lattice parameters of a = b = 5.4619 Å and c = 12.0490 Å was determined for the bulk crystal utilizing from XRD analysis. Analyses of the ellipsometry data presented the photon energy dependencies of complex dielectric function of the crystal. T...
Phase transition of chemically synthesized FePt nanoparticles under high pressure
ŞİMŞEK, TELEM; Karci, Ozgur; ÖZCAN, ŞADAN (The Scientific and Technological Research Council of Turkey, 2018-01-01)
We present the results of a study related to phase transformation of chemically synthesized FePt nanoparticles under high pressure from face-centered cubic into face-centered tetragonal structure. As-synthesized nanoparticles are around 4.5 nm and show superparamagnetic behavior at 300 K. After annealing under 60 bar pressure of hydrogen at 400 degrees C for 2 h, nanoparticles exhibit strong ferromagnetic behavior with 5391 Oe coercivity. Results show that high-pressure annealing lowers the decomposition te...
Valorization of Şırnak asphaltite and biomass
Helvacı, Veysi; Üner, Deniz; Department of Chemical Engineering (2019)
In this study, the hydrogenation and pyrolysis behavior of Şırnak asphaltite, and the synergetic effect of increasing amount of liquid product obtained from steam distillation of Şırnak asphaltite and biomass and dry reforming were studied. For that purpose, Şırnak asphaltite samples were hydrogenated and pyrolyzed and the products are analyzed. For synergetic effect investigation, steam distillation of Şırnak asphaltite with and without the presence of pepper plant biomass was performed. Results show that ...
Dielectric Properties of Ethanol and Gasoline Mixtures by Terahertz Spectroscopy and an Effective Method for Determination of Ethanol Content of Gasoline
ARIK, Enis; Altan, Hakan; Esentürk, Okan (American Chemical Society (ACS), 2014-05-01)
Investigation of frequency dependent permittivity of mixture solutions provides information on the role of intermolecular interactions on relaxation processes of solvent and solute molecules. In this study the dielectric properties of ethanol/gasoline mixtures in the terahertz spectral region are investigated. Frequency dependent absorption coefficients, refractive indices, and complex permittivities of pure ethanol and gasoline, and their mixtures at varying ethanol volume percentages (v/v %) are reported....
Poly(lactic acid) based nanocomposites: mechanical, thermal and rheological properties and morphology
Açık, Eda; Yılmazer, Ülkü; Department of Chemical Engineering (2014)
The aim of this study was to increase the potential applications of poly(lactic acid) (PLA) by incorporating reactive functionalities with different nano-scale fillers. To investigate the effects of nanoclay types, five different organically modified nanoclays (Cloisites®15A, 25A and 30B and Nanofils®5 and 8) were used. Two elastomeric compatibilizers, ethylene-glycidyl methacrylate (E-GMA) and ethylene-butyl acrylate-maleic anhydride (E-BA-MAH), were added to the nanocomposites produced via melt compoundin...
Citation Formats
H. Orbey, C. Balci, and G. Guruz, “Phase equilibrium of asymmetric systems by predictive equations of state models,” INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, pp. 963–967, 2002, Accessed: 00, 2020. [Online]. Available: