Studies on salt hydrates for latent heat storage. V. Preheating effect on crystallization of sodium acetate trihydrate from aqueous solution with a small amount of sodium pyrophosphate decahydrate.
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概要
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Influences of preheating temperature and time were studied on the crystallization of CH<SUB>3</SUB>CO<SUB>2</SUB>Na·3H<SUB>2</SUB>O from three kinds of CH<SUB>3</SUB>CO<SUB>2</SUB>Na aqueous solutions, whose concentrations were 58.0, 60.3, and 62.8 wt% and which contained a small amount of crystal nucleation catalyst, Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>·10H<SUB>2</SUB>O. In 60.3 wt% aqueous solution (CH<SUB>3</SUB>CO<SUB>2</SUB>Na·3H<SUB>2</SUB>O), the nucleation catalyst begins to get deactivated by preheating at about 81 °C, higher by 23 °C than the melting point of CH<SUB>3</SUB>CO<SUB>2</SUB>Na·3H<SUB>2</SUB>O. The temperature at which the catalyst begins to get deactivated is raised with increasing CH<SUB>3</SUB>CO<SUB>2</SUB>Na concentration of the solution; thus, in 62.8 wt% CH<SUB>3</SUB>CO<SUB>2</SUB>Na aqueous solution, the catalyst begins to get deactivated at 85 °C. One hundred samples, each consisting of 8 g of 60.3 wt% CH<SUB>3</SUB>CO<SUB>2</SUB>Na aqueous solution and 0.16 g of Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>·10H<SUB>2</SUB>O, all crystallized on cooling to 40 °C, even after they had been preheated at 80 °C for 39 h. These results are explained on the basis of the crystalline adsorption model proposed by Richards.
- 公益社団法人 日本化学会の論文
著者
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Wada Takahiro
Central Research Laboratories Matsushita Electric Industrial Co. Ltd.
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Matsuo Yoshihiro
Central Research Laboratory Matsushita Electric Industrial Co. Ltd.
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Matsunaga Koji
Central Research Laboratory, Matsushita Electric Industrial Co., Ltd.
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