METHOD FOR OBTAINING MFI ZEOLITE Russian patent published in 2017 - IPC C01B39/38 

FIELD: chemistry.

SUBSTANCE: MFI zeolite synthesis method involves the preparation of a precursor having a composition corresponding to the crystallization region of zeolite. The precursor is prepared by impregnating the solid particles of silica gel with a reaction mixture providing in the precursor a molar ratio of SiO₂:Al₂O₃ not less than 30, a molar ratio of MeOH:SiO₂ less than 0.3, where Me is an alkali metal, a molar ratioH₂O:SiO₂ in the range of 2.2 to 3.3. The precursor is then crystallized at an elevated temperature in the absence of free water. Immediately after the crystallization step, the resulting solid particles having a particle shape identical to that of the original silica gel particles are treated with water to form a slurry of zeolite crystals in water. After isolation of the zeolite particles, they are dried and, if necessary, calcined and ion exchanged.

EFFECT: simplifying the process by reducing the process operations, reducing the water consumption and increasing the process efficiency while maintaining high performance characteristics of MFI zeolite.

9 cl, 3 dwg, 1 tbl, 12 ex