Upper consolute temperature of water-phenol systems with some additives

2006 ◽  
Vol 3 (4) ◽  
pp. 334-339
Author(s):  
M. Singh
Keyword(s):  
Consolute Temperature

Phase diagram for ethylene glycol and triethylamine

1967 ◽  
Vol 20 (7) ◽  
pp. 1343
Author(s):  
EL Davids ◽  
TJV Findlay
Keyword(s):  
Carbon Dioxide ◽  
Phase Diagram ◽  
Liquid Phase ◽  
Ethylene Glycol ◽  
Mole Fraction ◽  
Consolute Temperature

The liquid-liquid phase diagram for ethylene glycol and triethylamine has been determined. This mixture has a lower consolute temperature of 57.7 � 0.1� at 0.45 � 0.1 mole fraction triethylamine. Both carbon dioxide and water lower the lower consolute temperature. The densities and viscosities of solutions just below the lower consolute temperature do not exhibit any abnormalities.

THE COMPLEX DIELECTRIC CONSTANT OF SOLUTIONS OF TRIMETHYLPENTANE AND NITROBENZENE NEAR THE CONSOLUTE TEMPERATURE

1961 ◽  
Vol 39 (3) ◽  
pp. 526-534 ◽  
Author(s):  
B. D. Ripley ◽  
R. McIntosh
Keyword(s):  
Dielectric Constant ◽  
Phase Separation ◽  
Standing Wave ◽  
Applied Field ◽  
Coaxial Line ◽  
Dielectric Constants ◽  
Complex Dielectric Constant ◽  
Experimental Procedure ◽  
Chemical Systems ◽  
Consolute Temperature

The complex dielectric constants of three compositions of trimethylpentane and nitrobenzene have been measured as a function of temperature for a range near the consolute temperature. The frequency employed was 3300 Mc/sec. The experimental procedure involved the study of the standing wave established in a coaxial line. The chemical systems showed maxima in both the real and imaginary parts of the complex dielectric constant at temperatures above those at which phase separation occurs. The finding of Semenchenko and Azimov is thus confirmed. A discussion of the validity of applying thermodynamic formulae to dielectrics showing loss is given and some qualitative remarks are offered concerning the change of the systems as they are cooled. These remarks are based upon the effect of the applied field upon the entropy of the solutions.

Phase studies on the iron–selenium system

1968 ◽  
Vol 46 (8) ◽  
pp. 1171-1174 ◽  
Author(s):  
J. E. Dutrizac ◽  
M. B. I. Janjua ◽  
J. M. Toguri
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
The Other ◽  
Sampling Techniques ◽  
Liquid Region ◽  
Consolute Temperature ◽  
Liquid Sampling

The quasi-reduced iron–selenium phase diagram has been determined by a combination of differential thermal analysis, visual polythermal, and liquid sampling techniques. Iron and selenium form two compounds: FeSe2 with a broad stoichiometry range and FeSe2 with a much narrower composition field. The former compound was found to melt congruently at 1070 °C and 53.5 atomic % selenium, while the latter melted incongruently at 585 °C. Two liquid–liquid regions were observed in this system. One occurred above 790 °C from 73.9 atomic % selenium to about 99.92% selenium with a consolute temperature of 1070 °C at approximately 93 atomic % selenium. The other liquid–liquid region extends upwards from 1520 °C and lies between 3 and 39.5 atomic % selenium.

Pressure–temperature–composition relations in the system anthracene–phenanthrene

1967 ◽  
Vol 45 (10) ◽  
pp. 1125-1134 ◽  
Author(s):  
M. Xavier Brady ◽  
Norman O. Smith
Keyword(s):  
Solid Solutions ◽  
Cooling Curve ◽  
Vapor Pressures ◽  
Phase Line ◽  
X Ray ◽  
Three Phase ◽  
Liquid Solutions ◽  
Complete Series ◽  
Solid Liquid ◽  
Consolute Temperature

A melting point and cooling curve study of the solid–liquid equilibria in the system anthracene–phenanthrene indicated the existence of a complete series of solid solutions. Investigation of the system anthracene–phenanthrene–Cellosolve at 40 °C revealed that the series is incomplete at this temperature. X-ray studies showed an upper consolute temperature at about 80 °C. The sublimation pressures and vapor pressures of the pure components were measured at temperatures not heretofore studied. Sublimation pressure data for solid solutions at 95 °C gave activity coefficients and indicated positive deviations from Raoult's law. Liquid–vapor isobars were obtained at pressures of 25, 50, and 100 mm, and vapor pressures of dilute liquid solutions of anthracene in phenanthrene found at temperatures near 100 °C. The data point to the existence of an azeotrope of short range. The univariant three-phase line was determined in respect to the pressure, temperature, and composition of the coexisting phases.All the above results were synthesized to give a fairly complete picture of the pressure–temperature–composition phase model, excluding critical phenomena.

scholarly journals Precision Thermal Treatments, Atom Probe Characterization, and Modeling to Describe the Fe-Cr Metastable Miscibility Gap

2021 ◽  
Vol 52 (4) ◽  
pp. 1453-1464
Author(s):  
Alexander Dahlström ◽  
Frederic Danoix ◽  
Peter Hedström ◽  
Joakim Odqvist ◽  
Malin Selleby ◽  
...  
Keyword(s):  
High Precision ◽  
Thermodynamic Modeling ◽  
Experimental Work ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Miscibility Gap ◽  
Thermal Treatments ◽  
Micro Hardness ◽  
Consolute Temperature ◽  
Vickers Micro Hardness

Abstract The Fe-Cr metastable miscibility gap has been studied by high-precision thermal treatments, Vickers micro-hardness (HV) measurements, and atom probe tomography (APT). Thermodynamic modeling further supplements the experimental work. The results obtained show that recent thermodynamic descriptions of the metastable miscibility gap found in literature generally overestimates the consolute temperature. We can show that the source of ambiguity in previous studies is most likely a lack of clear distinction between Cr-Cr clustering and $$ \alpha^{\prime} $$ α ′ formation. This distinction is here made by APT results, and it leads to a determined consolute temperature of 580 ± 1 °C for Fe0.50Cr0.50. The revised thermodynamic modeling of the metastable miscibility gap captures the experimental results and is consistent with the overall picture from the Fe-Cr data in the literature. Graphic Abstract

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