METHOD OF PREPARING MICROCRYSTALLINE NAY ZEOLITE Russian patent published in 2017 - IPC C01B39/24 

FIELD: chemistry.

SUBSTANCE: method of preparing the microcrystalline NaY zeolite comprises precipitating an aluminosilicate gel from solutions of sodium silicate, aluminium sulfate and sodium aluminate, introducing an amorphous aluminosilicate seed, crystallizing the precipitated gel at a temperature of 92-95°C and cooling the resulting zeolite slurry. The suspension of zeolite is cooled to a temperature of not more than 60°C by discharging cold water into a suspension with a speed of, at least, 20°S/h. The composition of the aluminosilicate gel to be crystallized has a molar ratio (Na₂-Al₂O₃)/SiO₂ in the range of 0.37-0.39, which provides the necessary excess alkalinity.

EFFECT: preparing a pure zeolite while reducing the duration of its preparation.

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