YAKUGAKU ZASSHI
Online ISSN : 1347-5231
Print ISSN : 0031-6903
ISSN-L : 0031-6903
ジフェニルヒダントインナトリウムの物理化学的研究 (第6報)
ジフェニルヒダントインナトリウム水和物の解離水蒸気圧と吸湿性
石黒 武雄古座谷 醇柴田 和秀
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1958 年 78 巻 4 号 p. 391-394

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Dissociation vapor pressure of diphenylhydantoin sodium hydrates was measured at a temperature between 20° and 50° using a differential tensimeter and it was found that mono-, tetra-, hepta-, octa-, and hendecahydrates existed in diphenylhydantoin sodium. An empirical formula log P=A-B/T can be given to relationship between the dissociation vapor pressure and temperature and the values of constants A and B for each hydrate system were calculated. It was proved that the transition temperature of 37.6°, 45.2°, and 51.3°, presumed from the solubility curve and viscosity-temperature curve in the preceding paper, agreed respectively with the transition temperature of hendecahydrate-octahydrate, octahydrate-heptahydrate, and heptahydrate-tetrahydrate. Comparison of monthly average humidity in seven areas in Japan and dissociation vapor pressure of the hydrates indicated that the heptahydrate was the most stable in air in a country like Japan with high average humidity.

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© by the PHARMACEUTICAL SOCIETY OF JAPAN
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