The Research On Preparation Technology Of Modified Zeolite Molecular Sieve

Zeolite is a kind of cellular material, which has good ion-exchanging, catalytic and adsorptive capacity. Zeolite to be used as molecular sieve pushes forward zeolite industrial development greatly in adsorption stripping field. In addition, that zeolite's structure and function can be modified considerably expands the application limits of zeolite molecular sieve.As we all known, there is plenty of mixed xylene in industry, and there are three isomers in the mixed xylene with considerable percentage. The mixed xylene is very important chemical materials, and can be converted to many kinds of products or intermediate products. But it is used just as solvent, so used as solvent is a waste of resource. It is necessary to find an effective method to separate isomer from the mixture to enhance the efficiency and extra value of the product. There is further research of selectivity of zeolite molecular sieve to adsorbing and separating mixed xylene in this thesis.In recent years. People have attained enormous achievement in zeolite molecular sieves, but it isn't reported that the experiment uses 13X zeolite molecular sieves as inspecting particle size distribution and adsorptive separating organic isomer with different particle size segment. The experiment uses 13X zeolite molecular sieve as modified subject and investigates the separation effect of mixed xylene by means of packed column gas chromatography. The paper studies the co-modification technology and conditions about exchanging with potassium and barium cations alternately. The thesis also inspects the influence on adsorptive separation effect of modification technology route and modification technology conditions. By experiments, we attempt to find suitable modification method to prepare adsorbent. By suitable modification method to prepare amplifying experiments. It is concluded that amplifying experiments are suitable for the industry of production.By former experiments, we can conclude the appropriate co-modification methods. Exchanging ratio is 1/1. Exchanging time is 2h. Exchanging temperature is 75℃. Baking temperature is 600℃ for the first time and 700℃ for the others. Hydrothermal treatment...