Method of preparing spherical active alumina gel and spherical active alumina-silica gel

Claim 1

A METHOD OF PREPARING SPHERICAL ACTIVE ALUMINA GEL AND SPHERICAL ACTIVE ALUMINA-SILICA GEL, SAID GELS BEING WITHOUT CRACKS, WHICH COMPRISES PASSING THROUGH AN INERT, WATER-IMMISCIBLE, LIQUID MEDIUM WHOSE TEMPERATURE IS 40* TO 100*C. A STOCK SOLUTION SELECTED FROM THE GROUP CONSISTING OF AN AUEOUS COLLOIDALSOLUTION OF BASIC ALUMINUM SULFATE HAVING THE COMPOSITION AL2O3 1.6-0.8 SO3, AND A MIXED SOLUTION OF AN AQUEOUS COLLOIDAL SOLUTION OF BASIC ALUMINUM SULFATE HAVING THE COMPOSITION AL2O3 1.60.8 SO3 AND A SILICA SOL OF PH 1-3 WHEREIN THE SIO2/ (AL2O3+SIO2) IS ON A WEIGHT BASIS LESS THAN 55%, THEREBY FORMING SAID SOLUTION INTO HOMOGENEOUS SPHERICAL HYDROGELS, THEN TRANSFERRING INTO WATER SAID HYDROGELS BEFORE A SOFTENING PHENOMENON OCCURS THEREIN, FOLLOWED BY WASHING SAID HYDROGELS WITH WATER SO AS TO RENDER THE SAME SPHERICAL HYDROGELS WHOSE SO3/AL2O3 ON A MOLAR BASIS IS 0.4-0.7, REPEATEDLY CONTACTING SAID HYDROGELS WITH AN ALKALINE SOLUTION WHICH IS CAPABLE OF GRADUALLY CONVERTING THE SULFATE RADICALS REMAINING IN SAID HYDROGELS INTO THE CORRESPONDING WATER-SOLUBLE SALTS, SAID REPEATED CONTACTING BEING CONTINUED UNTIL A GREATER PORTION OF SAID SULFATE RADICALS ARE CONVERTED INTO SAID WATER-SOLUBLE SALTS AND THE AMOUNT OF SAID ALKALINE SOLUTION DIRECTLY CONTACTING SAID HYDROGELS AT ANY TIME BEING LESS THAN THAT REQUISITE FOR SAID CONVERSION OF SAID GREATER PART OF SAID SULFATE RADICALS, AND THEREAFTER CONTACTING THE HYDROGELS WITH AN AQUEOUS ALKALINE SOLUTION WHICH IS CAPBLE OF FORMING A WATER-SOLUBLE SULFATE SALT UPON CONTACTING ALUMINUM SULFATE AND HAVING A PH OF AT LEAST 7, THEREBY FORMING SPHERICAL HYDROGELS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM HYDROXIDE AND HYDRATED ALUMINA-SILICA, FOLLOWED BY DRYING AND CALCINING THE SAME.

Claim 2

A METHOD OF PREPARING SPHERICAL ACTIVE ALUMINA GEL AND SPHERICAL ACTIVE ALUMINA-SILICA GEL, SAID GELS BEING WITHOUT CRACKS, WHICH COMPRISES PASSING THROUGH AN INERT, WATER-IMMISCIBLE, LIQUID MEDIUM WHOSE TEMPERATURE IS 40* TO 100*C. A STOCK SOLUTION SELECTED FROM THE GROUP CONSISTING OF AN AUEOUS COLLOIDALSOLUTION OF BASIC ALUMINUM SULFATE HAVING THE COMPOSITION AL2O3 1.6-0.8 SO3, AND A MIXED SOLUTION OF AN AQUEOUS COLLOIDAL SOLUTION OF BASIC ALUMINUM SULFATE HAVING THE COMPOSITION AL2O3 1.60.8 SO3 AND A SILICA SOL OF PH 1-3 WHEREIN THE SIO2/ (AL2O3+SIO2) IS ON A WEIGHT BASIS LESS THAN 55%, THEREBY FORMING SAID SOLUTION INTO HOMOGENEOUS SPHERICAL HYDROGELS, THEN TRANSFERRING INTO WATER SAID HYDROGELS BEFORE A SOFTENING PHENOMENON OCCURS THEREIN, FOLLOWED BY WASHING SAID HYDROGELS WITH WATER SO AS TO RENDER THE SAME SPHERICAL HYDROGELS WHOSE SO3/AL2O3 ON A MOLAR BASIS IS 0.4-0.7, REPEATEDLY CONTACTING SAID HYDROGELS WITH AN ALKALINE SOLUTION WHICH IS CAPABLE OF GRADUALLY CONVERTING THE SULFATE RADICALS REMAINING IN SAID HYDROGELS INTO THE CORRESPONDING WATER-SOLUBLE SALTS, SAID REPEATED CONTACTING BEING CONTINUED UNTIL A GREATER PORTION OF SAID SULFATE RADICALS ARE CONVERTED INTO SAID WATER-SOLUBLE SALTS AND THE AMOUNT OF SAID ALKALINE SOLUTION DIRECTLY CONTACTING SAID HYDROGELS AT ANY TIME BEING LESS THAN THAT REQUISITE FOR SAID CONVERSION OF SAID GREATER PART OF SAID SULFATE RADICALS, AND THEREAFTER CONTACTING THE HYDROGELS WITH AN AQUEOUS ALKALINE SOLUTION WHICH IS CAPBLE OF FORMING A WATER-SOLUBLE SULFATE SALT UPON CONTACTING ALUMINUM SULFATE AND HAVING A PH OF AT LEAST 7, THEREBY FORMING SPHERICAL HYDROGELS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM HYDROXIDE AND HYDRATED ALUMINA-SILICA, FOLLOWED BY DRYING AND CALCINING THE SAME.