吸附分离二甲苯的分子筛微波改性条件研究

Study on the modified conditions of molecular sieve by microwave method and its application in separating xylene

介绍微波法对13X分子筛进行复合离子交换的方法。以等离子体单道扫描光电直读光谱仪、原子吸收光谱仪、填充柱分离色谱和差热-热重分析仪为手段,考察改性分子筛的交换效率、对混合二甲苯的吸附分离效果及对二甲苯各组分的吸附能力等指标,从而优化改性工艺。在此工艺下制备的改性分子筛交换度>90%,分离度>2.5,对二甲苯与间二甲苯的吸附分离系数为1.69,对二甲苯与邻二甲苯吸附分离系数为1.42,达到吸附分离二甲苯的效果。与常规方法相比较,微波法改性工艺的离子交换时间将缩短11倍,耗电量仅为常规法的7.3%。

The method of modified 13X molecular sieve by microwave composite ion-exchange was introduced.The exchange efficiency of modified 13X zeolite molecular sieve,the separation effect of mixed xylene and the different adsorption capacities of three isomers were investigated by using ICP,Auto adsorption spectrometer,packed column of chromatography and differential thermal analyzer(DTA-TG) in order to optimize the modification technology.The exchange degree under this technology surpassed 90%,the separation degree reached 2.5,the adsorption separation coefficient of o-xylene to m-xylene was 1.69,the adsorption separation coefficient of o-xylene to p-xylene was 1.42,which achieved the effect of adsorption and separation of xylene.Compared with the conventional method,the ion-exchange time by microwave modification method was one eleventh,and the power consumption was 7.3%.