PROCESS FOR THE MANUFACTURE OF ZAOLITES 4A PARTICULARLY SUITABLE FOR FORMULATING DETERGENT COMPOSITIONS

摘要

THE INVENTION RELATES TO A PROCESS FOR THE SYNTHESIS OF ZEOLITES4A WITH HIGH CRYSTALLINITY AND FINE GRANULOMETRY, BY ADDITION, IN A FIRST STAGE, OF A SODIUM SILICATE SOLUTION TO A SODIUM ALUMINATE SOLUTION (CONTAINING EXCESS NAOH AND HEATED AT A TEMPERATURE OF 50 TO 100C) AND BY CRYSTALLIZATION, IN A SECOND STAGE, AT A TEMPERATURE BETWEEN 70 AND 105C, THIS PROCESS IS CHARACTERIZED IN THAT THE TEMPERATURE OF THE SILICATE IS AT LEAST 20C LESS THAN ALUMINATE THE SIO: HO AND SIO: NAO MOLAR RELATIONSHIPS IN THE SILICATE SOLUTION BEING 0.030 TO 0.150 AND 1.95 TO 2.30, RESPECTIVELY, AND THE WEIGHT RELATIONSHIP BETWEEN MOTHER LIQUEZER AND ZEOLITE THUS INCLUDED BETWEEN 6 , 5 AND 20.