Influence of dehydrating transition of Na3PO412H2O on acceleration for nucleation of NaCH3COO3H2O.

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  • ＮａＣＨ３ＣＯＯ・３Ｈ２Ｏの核化促進に及ぼすＮａ３ＰＯ４・１２Ｈ２Ｏの脱水転移の影響
  • NaCH3COO 3H2O ノ カクカ ソクシン ニ オヨボス Na3PO4

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To clarify the activation phenomenon of Na3PO4·12H2O as a nucleation agent, added to a melt of NaCH3COO·3H2O as a heat storage material (m.p. 331K), the nucleation characteristics of such activated samples were investigated in detail at various heating temperatures for activation treatment from 333 to 371K. For samples including an agent crystallized as hexahydrate salt by heating at a temperature lower than 348K, the ratio of the number of samples in which nucleation occurred was about 65% during continuous cooling to room temperature (293K). For the case of the agent crystallized as hemihydrate salt at a temperature beyond 353K, nucleation occurred in all samples up to 325K, which was a temperature 6K lower than the melting point of the heat storage material, and strong nucleation activity was observed. At temperatures from 348 to 353K, the nucleation activity became strong by change of the agent's crystal structure from hexahydrate to hemihydrate, due to the temperature elevation. However, the nucleation agent began to lose its activity by heating at a temperature beyond 363K and was inactivated completely at 371K, its nucleation capability was restored by reactivation treatment.

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