Acid-treated clay catalyst for cracking hydrocarbons

Claim 1

THE METHOD OF PRODUCING FROM CLAY, CATALYST HAVING LOW COKE-PRODUCING PROPERTIES IN CRACKING OF PETROLEUM HYDROCARBONS, WHICH METHOD COMPRISES TREATING WITH MINERAL ACID AN ACID ACTIVATABLE SUB-BENTONITE MONTMORILLONITE CLAY TO A CONTROLLED EXTENT BEYOND THAT NECESSARY TO DEVELOP MAXIMUM GASOLINE PRODUCING CHARACTERISTICS FOR PETROLEUM CRACKING, AND SUFFICIENT TO FORM AN ACID ACTIVATED CLAY OBTAINING LOWER GASOLINE PRODUCTION IN CRACKING OF PETROLEUM HYDROCARBONS THAN SAID MAXIMUM, SAID ACID TREATMENT BEING CARRIED OUT IN SEVERAL DISTINCT STAGES OF TREATMENT WITH FRESH ACID AND TO AN EXTENT RESULTING IN THE PROVISION OF A CATALYTICALLY ACTIVE CLAY RESIDUE COMPRISING 1 TO 5% BY WEIGHT OF ALUMINA AND LESS THAN 0.8% IRON CALCULATED AS FE2O3 ON A VOLATILE FREE CLAY BASIS, AND IMPREGNATING SAID CLAY RESIDUE WITH HYDROUS ALUMINA, WHEREBY THE IMPREGNATED CLAY RESIDUE HAS A LESSER TENDENCY TO PRODUCE COKE IN PETROLEUM CRACKING THAN THE SAME CLAY ACID ACTIVATED TO ONLY MAXIMUM GASOLINE PRODUCING CAPACITY.

Claim 2

THE METHOD OF PRODUCING FROM CLAY, CATALYST HAVING LOW COKE-PRODUCING PROPERTIES IN CRACKING OF PETROLEUM HYDROCARBONS, WHICH METHOD COMPRISES TREATING WITH MINERAL ACID AN ACID ACTIVATABLE SUB-BENTONITE MONTMORILLONITE CLAY TO A CONTROLLED EXTENT BEYOND THAT NECESSARY TO DEVELOP MAXIMUM GASOLINE PRODUCING CHARACTERISTICS FOR PETROLEUM CRACKING, AND SUFFICIENT TO FORM AN ACID ACTIVATED CLAY OBTAINING LOWER GASOLINE PRODUCTION IN CRACKING OF PETROLEUM HYDROCARBONS THAN SAID MAXIMUM, SAID ACID TREATMENT BEING CARRIED OUT IN SEVERAL DISTINCT STAGES OF TREATMENT WITH FRESH ACID AND TO AN EXTENT RESULTING IN THE PROVISION OF A CATALYTICALLY ACTIVE CLAY RESIDUE COMPRISING 1 TO 5% BY WEIGHT OF ALUMINA AND LESS THAN 0.8% IRON CALCULATED AS FE2O3 ON A VOLATILE FREE CLAY BASIS, AND IMPREGNATING SAID CLAY RESIDUE WITH HYDROUS ALUMINA, WHEREBY THE IMPREGNATED CLAY RESIDUE HAS A LESSER TENDENCY TO PRODUCE COKE IN PETROLEUM CRACKING THAN THE SAME CLAY ACID ACTIVATED TO ONLY MAXIMUM GASOLINE PRODUCING CAPACITY.