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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Effect of water vapor pressure on thermal dehydration of lithium sulfate monohydrate
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Effect of water vapor pressure on thermal dehydration of lithium sulfate monohydrate

机译：水蒸气压对一水合硫酸锂热脱水的影响

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The effect of the atmospheric water vapor pressure on the rate of thermal dehyration of lithium sulfate monohydrate was studied by means of isothermal gravimetry under various water vapor pressures, ranging from 0 to 2666 Pa. The kinetics of dehydration was described by the two-dimensional Arvada-Erofe'ev type equation, A(2)(alpha). An unusual dependence of the rate of dehydration on the atmospheric water vapor pressure was observed as follows. At high temperature, the rate constant increased with increasing water vapor pressure, reached a maximum and decreased gradually to a constant value. At low temperatures, 90 and 100 degreesC, the rate constants decreased at first, passed through minimum, increased and then decreased. These unusual phenomena are known as the Smith-Topley effects. The mechanism of the phenomena can be discussed on the basis of the diffusion process of the dehydrated water molecules through the product phase. (C) 2002 Elsevier Science B.V. All rights eserved. [References: 26]
机译：通过等温重量分析法在0〜2666 Pa的各种水蒸气压力下研究了大气水蒸气压力对一水合硫酸锂热脱水率的影响。用二维Arvada描述了脱水动力学。 -Erofe'ev型方程，A（2）（alpha）。观察到脱水速率对大气水蒸气压力的异常依赖性如下。在高温下，速率常数随水蒸气压力的增加而增加，达到最大值，然后逐渐减小至恒定值。在90和100摄氏度的低温下，速率常数首先降低，经过最小值，然后升高然后降低。这些异常现象被称为史密斯-托普利效应。现象的机理可以在脱水水分子通过产物相的扩散过程的基础上进行讨论。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：26]

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