Study On The Modified Conditions Of Zeolite For Xylene's Separation By Microwave

The reversible ion-exchange is one important capability of zeolite. Using it can regulate the electric field and surface acidity in the crystalloid. Consequently, it can change the zeolite's characters and adjust the zeolite's specialties of adsorption and catalysis. As a sort of clean and high-efficient calefaction mode, microwave has increasingly received much recognition since years. There is tentative research on microwave technology applying to ion-exchange in the paper.In recent years, although the application of zeolite has achieved great success, inspections of the optimum modifying condition of 13X zeolite by microwave radiation have not yet reported, this point is the innovative aspect.The paper used 13X zeolite molecular sieve as modified subject and investigated the separation degree of mixed xylene by means of packed column gas chromatography. The paper inspected the influence on adsorptive separation effect of modifying parameters such as microwave radiation power, time of per ion-exchange, ion-exchange times and baking temperature etc, so as to optimize the modifying process.The dissertation based on the preliminary work, and the process developed in the exploration of modifying 13X zeolite by microwave. The optimum process conditions through experiments are as follows: the exchange ratio is 1:1, the hydrothermal treatment time is 0.3h, the number of ion-exchange is six, and the ion-exchange gradation is K-Ba-K-Ba-K-K. It determined the torrefaction temperature of 600℃, time of per ion-exchange as 10min, microwave radiation power to 280W. Under these conditions, the largest separation degree of the mixed xylene by modified zeolite was up to 5.0 above, the results are gratifying.Ion-exchange by microwave has these strong points: short time, scanty power consumption, efficient exchange effect. Thus it can be seen that the modification technology is feasible, the process conditions are operable. The goal of adsorptive separating mixed xylene by the composite modified zeolite has been achieved.