FIELD: production of molecular sieves. SUBSTANCE: zeolite substituted by means of ion exchange with ions of lithium, rubidium, cesium or monovalent groups IB is obtained ion exchange with zeolite containing sodium and/or potassium with ammonia ions; then, reaction of substituted zeolite with water-soluble compound of target metal, for example, lithium is conducted under conditions making it possible to remove ammonia from reaction zone. EFFECT: enhanced efficiency; reduced consumption of reagents. 5 cl, 2 tbl
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