Na_2SnF_6水解反应的高温高压实验方法研究

A STUDY ON THE EXPERIMENTAL METHOD OF Na_2SnF_6 HYDROLYSIS REACTION IN HYDROTHERMAL SOLUTIONS

用四种不同类型高压釜研究Na_2SnF_6在200—647℃、1 kbar条件下的水解特征。实验表明,淬火速率影响实验结果的精度。快速淬火高压釜及金袋摇摆釜是研究这类化学平衡反应的理想设备,采用水解法可获得水解常数及热焓。

Na_2SnF_6 hydrolysis reaction was investigated previously by using Morey pressure vessel (Wang et al., 1965). In the present study, the same experiments have been conducted by using the other three different pressure vessels: rapid quenching cold-seal pressure vessel (designed by Hemley J. J.), roking vessel with a golden bag (Dickson-type improved by Hemley, J. J.), and tuttle type routine cold-seal vessel at 200—647℃ and 1 kbar. The experimental results obtained are compared, suggesting that quenching rates would affect the precision of experimental results, especially over 400℃. The rapid quenching vessel and the rocking vessel with a golden bag are ideal apparatuses for chemical equilibrium reactions of this kind. The use of the hydrolysis method described allows one to work out the constant for hydrolysis reaction and the corresponding enthalpy.