Solid-Liquid Phase Equilibria of Organic Compounds Under High Pressures
Project/Area Number |
62550697
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
化学工学
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Research Institution | Kobe University |
Principal Investigator |
MAKITA Tadashi Faculty of Engineering, Kobe University; Professor, 工学部, 教授 (50031034)
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Co-Investigator(Kenkyū-buntansha) |
KUBOTA Hironobu Faculty of Engineering, Kobe University; Associate Professor, 工学部, 助教授 (60031077)
|
Project Period (FY) |
1987 – 1988
|
Project Status |
Completed (Fiscal Year 1988)
|
Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
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Keywords | Solid-liquid equilibria / Pressure effect / Phase diagram / Phase equilibria / Eutectic point / Solid solution / 分子間化合物 / 調和融点 / 分解融点 / 高圧力 / 相図 / 融解潜熱 |
Research Abstract |
Solid-liquid phase equilibria of the binary mixtures of organic compounds have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel newly designed. The uncertainties in the measurements of temperature, pressure and composition are within 0.1 K, 0.5 MPa and 0.001 mole fraction, respectively. 1 Systems investigated (1) simple eutectic systems : benzene + cyclohexane, benzene + 2-methyl-2-propanol (2) systems with formation of intermolecular compounds : carbon tetrachloride + benzene, carbon tetrachloride + p-xylene (3) partial solid solution system : -methylnaphthalene + -methylnaphthalene (4) complete solid solution system : chlorobenzene + bromobenzene 2 Apparatus and experimental procedures The measurements were performed in a high-pressure vessel with a couple of optical windows. The sample liquid of a known composition was introduced in the equilibrium vessel, which was immersed in a liquid bath thermostatically controlled within 0.05 K, and was compressed gradually. The phase transition and solid-liquid coexistence were observed visually. 3 Experimental results and discussion The freezing temperature at a constant composition increases monotonously with increasing pressure in all cases of phase diagrams. The eutectic temperature shifts to higher temperature, and the eutectic composition shifts to richer composition of the component whose pressure coefficient of freezing temperature is larger. In the systems forming intermolecular compounds, it is found that the congruent melting point turns to the incongruent melting point, and that one compound disappears under high pressure. The solid-liquid coexistence curve can be correlated satisfactorily by an equation newly proposed for all systems.
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Report
(3 results)
Research Products
(17 results)