Process of preparing high silica faujasite

Abstract

Abstract SYNTHETIC FAUJASITE HAVING A SIO2/AL2O3 MOL RATIO OF AT LEAST 3.5 IS PRODUCED BY ACID LEACHING CALCINED KAOLIN CLAY TO A SIO2/AL2O3 MOL RATIO WITHIN THE RANGE OF ABOUT 4 TO 10, WASHING THE ACID LEACHED CLAY UNTIL SUBSTANTIALLY FREE OF ACID, COMMINGLING THE CLAY WITH SODIUM HYDROXIDE AND WATER IN SPECIFIED MOLD RATIOS OF NA2O, AL2O3, SIO2, AND H2O, OPTIONALLY AGING THE REACTION MIXTURE AT A TEMPERATURE IN THE RENGE OF ABOUT 20*C. TO 35*C., AND THEREAFTER HEATING THE REACTION MIXTURE TO A TEMPERATURE IN THE RANGE OF ABOUT 95*C. TO 35*C., AND DEGREE OF FORMATION OF FAUJASITE HAS TAKEN PLACE. DELAMINATED KAOLIN CLAY ISPREFERRED. OPTIONALLY, FLUORIDE IONS ARE ADDED TO THE REACTION MIXTURE TO INCREASE THE SIO2/AL2O3 MOL RATIO OF THE FAUJASITE PRODUCT. ALSO, OPTIONALLY, THE CALCINED KAOLIN CLAY IS ACOD LEACHED TO A SIO2/AL2O3 MOL RATIO IN THE RANGE OF ABOUT 10 TO 50 AND SODIUM HYDROXIDE ADDED TO THE CLAY-ACID LEACH MIXTURE TO RAISE THE PH THEREOF SO AS TO REPRECIPITATE SOME OF THE ALUMINA TO PRODUCE A CLAY HAVING A SIO2/AL2O3 MOL RATION IN THE RANGE OF ABOUT 4 TO 10 PRIOR TO WASHING THE ACIDLEACHED CLAY.

Inventors

• 👤 G Hoffman

Bibliographic Details