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本文采用差热分析(DTA),热重分析测量法(TGA)研究了活性硅胶对甲醇、乙醇、丙烯酸、乙酸、正丁醇、苯酚、氨水,水以及乙烯和二氧化碳气体的吸附特性,并定量地计算了吸附量和吸附热的大小。通过DTA与TGA的实验与计算,从而表明:活性硅胶的吸附量,一般随有机物吸附质的分子量增加而趋于减少,而极性分子的吸附量大于非极性分子,含不饱和键的有机物分子的吸附量大于含饱和键的有机物分子;同时还初步探讨了活性硅胶的吸附特性与吸附质分子结构的关系。
In this paper, the adsorption characteristics of activated silica gel on methanol, ethanol, acrylic acid, acetic acid, n-butanol, phenol, ammonia, water and ethylene and carbon dioxide gas were studied by differential thermal analysis (DTA) and thermogravimetric analysis (TGA) Calculated the amount of adsorption and the size of the heat of adsorption. Through the experiments and calculations of DTA and TGA, it shows that the adsorption capacity of silica gel tends to decrease with the increase of the molecular weight of organic adsorbates, while the adsorption capacity of polar molecules is larger than that of non-polar molecules and unsaturated bond-containing organics The adsorption amount of the molecule is larger than that of the organic molecule containing the saturated bond. At the same time, the relationship between the adsorption property of the active silica gel and the molecular structure of the adsorbate is also discussed.