States of Phase Equilibrium in Diphenyl Oxide–n-Heptadecane and Biphenyl–Diphenyl Oxide–n-Heptadecane Systems

Russian Journal of Physical Chemistry A - Nonvariant equilibrium points in diphenyl oxide–n-heptadecane and biphenyl–diphenyl oxide–n-heptadecane systems are calculated according...     

Phase diagrams of diphenyl–<Emphasis Type="Italic">n</Emphasis>-dodecane and diphenyl–diphenyl oxide–<Emphasis Type="Italic">n</Emphasis>-dodecane systems

The phase equilibria in the binary diphenyl–n-dodecane and ternary diphenyl–diphenyl oxide–n-dodecane systems was studied by differential scanning calorimetry. The melting temperatures and eutectic compositions were determined. The physicochemical characteristics of eutectic alloys such as the flash point, density, and enthalpy of fusion were given. The kinematic viscosity of eutectic alloys was determined in the temperature range 25–50°C.     

Phase diagrams of diphenyl ether–n-tetradecane and diphenyl–n-tetradecane systems

Phase equilibria in diphenyl ether–n-tetradecane and diphenyl–n-tetradecane systems are investigated calorimetrically. The phase diagrams of these systems are calculated using the Schröder–Le Châtelier equation. Based on the calculated data, an experimental study of phase equilibria by means of differential scanning calorimetry is planned. The melting points, fusion enthalpies of the eutectics, and their compositions are determined. The liquidus curves of the systems are built using the experimental data.

     

Phase Diagrams of the <Emphasis Type="Italic">n</Emphasis>-Decane–<Emphasis Type="Italic">n</Emphasis>-Hexadecane–Cyclododecane, <Emphasis Type="Italic">n</Emphasis>-Decane–Cyclododecane,and <Emphasis Type="Italic">n</Emphasis>-Hexadecane–Cyclododecane Systems

The n-decane–n-hexadecane–cyclododecane, n-decane–cyclododecane, and n-hexadecane–cyclododecane systems are studied by means of low-temperature differential thermal analysis using a differential scanning heat flow calorimeter. It is noted that all studied systems belong to the eutectic type. It is concluded that in the n-decane–n-hexadecane–cyclododecane system, the eutectic composition contains 85.0 wt % n-С₁₀Н₂₂, 4.0 wt % n-С₁₆Н₃₄, and 11.0 wt % С₁₂Н₂₄. It has a melting point of ?35.0°C.     

Phase diagrams of systems composed of dibasic acids: Pentanedioic,hexanedioic, and nonanedioic

Phase equilibria in a three-component system composed of dibasic acids (hexanedioic, pentanedioic and nonanedioic) are investigated by means of differential thermal analysis. The eutectic composition is determined: 48.0 wt % pentanedioic acid, 20.0 wt % hexanedioic acid, and 32.0% nonanedioic acid. The melting temperature of the alloy is 70°C. It is concluded that this eutectic composition can be used to prepare electrolyte for thin-layer anodization.     

Phase Diagram for a Four-Component System of Pentanedioic,Hexanedioic, Nonanedioic,and Decanedioic Acids

Phase equilibria in a four-component system of pentanedioic, hexanedioic, nonanedioic, and decanedioic acids are studied via differential thermal analysis. The determined eutectic composition is pentanedioic acid, 48.1 wt %; hexanedioic acid, 10.0 wt %; nonanedioic acid, 25.7 wt %; and decanedioic acid, 16.2 wt %. The melting point of the eutectic mixture is 63.1°C.     

Phase diagrams of a condensed decane–eicosane–cyclododecane system

An n-eicosane–cyclododecane–n-decane system related to eutectic-type systems is investigated by means of differential thermal analysis. The eutectic alloy with melting point of–33.8°C contains 2.8 wt % of n-eicosane, 89.2 wt % of n-decane, and 8.0 wt % of cyclododecane.     

Phase diagram of a system of adipic,glutaric, and sebacic acids

Adipic acid–glutaric acid, glutaric acid–sebacic acid, and adipic acid–sebacic acid binary systems are studied, along with an adipic acid–glutaric acid–sebacic acid ternary system. It is shown all of these systems are eutectic. Phase equilibria for the diagram elements of the binary systems and the ternary system are described. It is concluded that the above low-melting compounds can be recommended for use as working bodies in heat accumulators, and for preparing electrolytes used in the thin-layer anodic oxidation of aluminum alloys.     

Phase equilibria in the condensed system <Emphasis Type="Italic">n</Emphasis>-docosane–cyclododecane–<Emphasis Type="Italic">n</Emphasis>-decane

Phase equilibria in the system n-docosane–cyclododecane–n-decane are studied by means of differential thermal analysis. It is found that the system is of the eutectic type. The temperature of eutectic melting is found to be–34.9°C, the n-docosane content is 3.5 wt %, the n-decane content is 86.5 wt %, and the cyclododecane content is 10.0 wt %. It is concluded that the results can be used to create new optimal heatstorage materials.