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通过对CH3COONa·3H2O进行热重(TG)及差示扫描量热法(DSC)测试,分析了其热分解行为,并从热力学的角度对其脱水过程进行了讨论。结果表明,CH3COONa·3H2O的脱水过程可分为两个阶段,先失液态水形成CH3COONa溶液,再从溶液中脱出气态水,并且在加热过程中一直伴随着结晶水的蒸发逸出。用硅油覆盖的方法能很好地抑制低温时由于蒸汽压差异引起的CH3COONa·3H2O结晶水的不断蒸发逸出问题。
The thermogravimetry (TG) and differential scanning calorimetry (DSC) tests of CH3COONa · 3H2O were carried out to analyze the thermal decomposition behavior of CH3COONa · 3H2O. The dehydration process was also discussed from the thermodynamic point of view. The results show that the dehydration process of CH3COONa · 3H2O can be divided into two stages: the first loss of liquid water to form CH3COONa solution, and then the release of gaseous water from the solution, and in the heating process has been accompanied by evaporation of crystal water escape. The method of covering with silicone oil can well restrain the evaporating and escape problem of CH3COONa · 3H2O crystal water caused by the difference of vapor pressure at low temperature.