METHOD FOR PRODUCTION OF ZEOLITE-A, USEFUL AS DETERGENT MODIFYING ADDITIVE Russian patent published in 2005 - IPC

FIELD: method for production of zeolite-A.

SUBSTANCE: claimed method includes: 1) dilution of sodium aluminate alkali solution obtained as saturated alkali solution by Bayer method and having aluminum oxide concentration at least 140 g/l and ratio of Al₂O₃-Na₂O adjusted up to 0.5±0.01; 2) thorough agitation of alkali, water and sodium silicate to produce mixture with SiO₂-Na₂O ratio of 1.25-1.66 and H₂O-Na₂O ratio of 15-45; 3) dosed addition of hot sodium aluminate solution with temperature of 50-60^oC into sodium silicate solution with ambient temperature under continuous agitation to produce synthesis mixture, namely crystallization solution with molar SiO₂-Al₂O₃ ratio of 1.6-2.0 and H₂O-Na₂O ratio of 30-40; 4) crystallization solution heating from room temperature to 95^oC for 45-75 min under continuous agitation; 5) filtering recovery of zeolite-A and washing followed by drying and spraying.

EFFECT: simplified and economy method for production of zeolite-A.

6 cl, 3 ex