Pressure effect on solid-liquid equilibria for (1-Octanol+n-Alkane) mixtures
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Accession number;07A0043226
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| Title;Pressure effect on solid-liquid equilibria for (1-Octanol+n-Alkane) mixtures |
| Author;
KACHI TAKASHI
(Kobe Univ., JPN)
SOTANI TOMOHIRO
(Kobe Univ., JPN)
MATSUO SHIGENOBU
(Kobe Univ., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.71-73(2006)
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| Figure&Table&Reference;FIG.6, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The high-pressure crystallization technique is one of separation and purification process. It is superior to other processes such as the cooling crystallization, from the viewpoint of the high purity of products and energy-conservation. Accurate knowledge of the solid-liquid phase equilibrium (SLE) relations at high pressures is essential for the design of this process. Not so many experimental data were available for solid-liquid phase equilibria under pressure. However, it is difficult to predict the phase behavior of mixtures under pressure. Therefore, the studies for the effect of pressure on various types of phase diagram of solid-liquid equilibria have much importance. In our laboratory, the solid-liquid phase equilibria of the (1-octanol+n-alkanes) systems have been investigated. Some results for {1-octanol+even-numbered n-alkanes (C8, C10, C12, C14, C16)} mixtures were reported. Furthermore, we take up a series of studies for (1-octanol+odd-numbered n-alkanes) system. In this work, we present results for the two odd-numbered n-alkanes: n-tridecane and n-pentadecane) with 1-octanol. The measurements were performed by visual observation at temperatures from 250 to 330K and pressures up to 220MPa with a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure, and composition are within .+-.0.1K, .+-.0.5MPa, .+-.0.0001 mole fraction, respectively. It was found that the freezing pressure at a constant composition increases monotonically with increasing temperature. The solid-liquid equilibium curve of each binary system increases to higher temperatures with increasing pressure almost parallel with the temperature coordinate. The eutectic mixtures become richer in the component with the highest slope dp/dT of the melting curve and the eutectic temperature rises with increasing pressure. The shift of the eutectic composition with increasing pressure agrees with the prediction with the van Laar equation. (author abst.) |
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