Characteristics of melting point depression in a melt system of disodium hydrogen phosphate dodecahydrate

Yasuyuki Watanabe*, Izumi Hirasawa

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Technology employing melting point depression can be useful for extending the applicable temperature range of a latent heat storage material. In this study, the melting points T m and latent heats of fusion ΔH f were measured in systems of disodium hydrogen phosphate dodecahydrate (with measured values of T m,0 =308.5 K and ΔH f,0 =227 kJ/kg), which is especially utilized as a medical heat-retention material, with five additives that are readily soluble in the dodecahydrate melt: tripotassium phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, and sodium dihydrogen phosphate dihydrate. By using the simplified empirical formula proposed previously expressing the relation between additive concentration and the degree of melting point depression (Watanabe and Hirasawa, 2017) or the degree of latent heat decrease (Watanabe, 2017), the abilities of each additive to depress melting point and decrease latent heat were numerically expressed. These values differed from one additive to another and appeared to be specific to each. However, the numerical relation expressed in the equation below was found to hold almost invariably regardless of the additive(forumala Presented).

本文言語English
ページ(範囲)372-378
ページ数7
ジャーナルkagaku kogaku ronbunshu
44
6
DOI
出版ステータスPublished - 2018 11 20

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)

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