Method of preparing crystalline {37 l{38 {0 zeolite

Claim 1

IN A METHOD FOR THE PREPARATION OF CRYSTALLINE ZEOLITE L WHEREIN REACTIVE SILICA IS DISPERSED IN AN ALKALINE REAGENT TO FORM AN AQUEOUS REACTION MIXTURE HAVING A MOLAR COMPOSITION CORRESPONDING TO ABOUT 0.3 TO ABOUT 1 K2O (K2O+NA2O), ABOUT 0.3 TO 0.6 (K2O+NA2O) SIO2, ABOUT 10 TO 40 SIO2 AL2O3, AND ABOUT 15 TO 140 H2O (K2O+NA2O), AND WHEREIN SAID REACTION MIXTURE IS DIGESTED AT A TEMPEATURE AND FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RECOVERABLE YIELD OF ZEOLITE L, THE IMPROVED METHOD FOR INCREASING THE RATE OF FORMATION AND OR YIELD OF L ZEOLITE, WHICH COMPRISES UTILIZING AS SAID REACTIVE SILICA A REACTIVE SILICA GEL PREPARE BY GELLING A SILICA SOURCE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, ALKALINE EARTH METAL AND AMMONIUM SILICATES AND SILICIC ACID IN AN AQUEOUS SOLUTION HAVING A SILICA CONCENTRATE CORRESPONDING TO A SIO2 H2O MOLE RATIO OF ABOUT LEAST ABOUT 0.005 AT A PH BELOW ABOUT 8 AND A TEMPERATURE BETWEN ABOUT 30* AND 250*F, CORRELATED WITH SAID PH TO PRODUCE A REACTIVE SILICA GEL CONTAINING AT LEAST ABOUT 4.5 WEIGHT PERCENT OF CHEMICAL WATER.