13X分子筛／氯化钙复合吸附剂用于净化乙烯中低浓度水分

13X/CaCl2 composite adsorbent for removal of micro water from ethylene gas stream

用浸渍法将易吸湿的CaCl2引入到13X分子筛中,制备了一系列13X分子筛基CaCl2复合吸附剂。采用N2物理吸附、元素分析和X射线衍射分析等方法对吸附剂进行了表征,并在固定床吸附器上进行选择性吸附脱除乙烯中微量水的实验。结果表明,在物理吸附和化学吸附的协同作用下,复合吸附剂的净化效果显著优于13X分子筛。吸附性能和CaCl2的浸渍量相关,随着CaCl2含量增加,复合吸附剂的吸附容量显著增大,但穿透吸附量呈现先增大后降低的变化规律。

A series of 13X/CaCl2 composite adsorbents were prepared by impregnating 13X molecular sieve with calcium chloride solution. The adsorbents were characterized by N2 adsorption, element analysis and X-ray diffraction analysis, and their dynamic adsorption capacities for water were measured in a fixed bed adserber. The results showed that the composite adsorbents had much higher water adsorption capacities than 13X molecular sieve due to the synergistic effect of physical and chemical adsorption. The adsorption capacity strongly depended on the amount of calcium chloride impregnated. The equilibrium adsorption capacities of the composite adsorbents increased obviously with the increase of calcium chloride in adsorbents, however, the breakthrough adsorption capacities increased at beginning and gradually decreased when the calcium chloride amount exceeded some Values.