Preparation And Adsorption Properties Of 4A Magnetic Molecular Sieve

4A molecular sieves with developed pores, strong adsorption often be used to adsorb trace water in the organic solvent, ammonia nitrogen ions and heavy metal ions in the sewage, toxic gases in the air, particular it can remove the trace water below 100μg/g, we can get the purity solvent.4A molecular sieves performed high adsorption capacity even in the conditions of low pressure, low concentration of water vapor and high temperature.4A molecular sieves because of its powder form was difficult to realize the solid-liquid separation in the solution.With the magnetically stabilized fluidized bed developed in separation magnetic material, magnetic molecular sieves performed super industry prospect. It was possible for 4A magnetic molecular sieves to be use recyclingly. Because 4A molecular sieves need active at high temperature after adsorbing trace water and iron oxides were easily oxidized in the process of combustion and loss magnetism. Nickel ferrite with good chemical stability and thermal stability can satisfy the need of activation with high temperature of 4A molecular sieves. In this paper, nickel ferrite (NiFe2O4) was chosen as the magnetic carrier used for synthesis of 4A magnetic molecular sieves.In this paper, sodium silicate and partial sodium aluminate were choose as raw material of 4A zeolite, the mature hydrothermal synthesis method was adopted to explore the effects of stirring time and hydrothermal time on the synthesis of 4A zeolite, to determine the best condition of synthesis of 4A molecular sieves. Similarly the environment temperature and adsorption time were explored to the effects on the synthesis of 4A zeolite. The mathematical equation of isothermal adsorption data was obtained by isothermal adsorption model. The process of 4A molecular sieves adsorbed trace water with time was simulated by Crank single pore diffusion model, and the adsorption kinetics principle of 4A molecular sieves was analyzed.In this paper,4A molecular sieves with developed cores as raw material and nickel ferrite as magnetic carrier,4A magnetic molecular sieves was synthesized with sol-gel method. Optimum experiment method and the best load of magnetic carrier for synthesis of 4A were determined.The isothermal adsorption curve and the time adsorption curve of 4A magnetic zeolite samples which adsorbed trace water in ethanol were made. Then the curves were fitted by mathematical model and its adsorption kinetics principle was analyzed by Crank single pore diffusion model.This topic provided a new idea for rapid separation and recycling of molecular sieves. The experiment of removing trace water from high concentration ethanol was carried out successfully. We hope this topic could provide reference for large-scale industrial production of anhydrous ethanol by 4A magnetic molecular sieves.