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US 4,396,496 AGranted
Cracking process
AssigneePhillips Petroleum Company
InventorsDavid R. Scharf, Earl H. Gray
Life of this patent
Estimating the term…
Abstract
Antimony compounds are employed to reduce catalyst attrition and improve catalyst performance in catalytic cracking units, especially in conjunction with strontium compounds.
Claims13
In a process comprising
- (a) cycling a cracking catalyst in a catalytic cracking unit comprising a cracking zone and a regeneration zone, said cracking catalyst having a particle size principally within the range of from about 500 to about 10,000 microns;
- and
- (b) contacting the cracking catalyst with a hydrocarbon feed in the cracking zone to produce a cracked product and a coked cracking catalyst and with an oxygen-containing gas in the regeneration zone to produce a regenerated cracking catalyst which is cycled back to the cracking zone and a gaseous effluent stream also containing a concentration of catalyst fines having a particle size principally below about 100 microns;
- the improvement comprising
- (c) adding an antimony compound to the catalytic cracking unit;
- and
- (d) adjusting the addition of said antimony compound so as to maintain the concentration of catalyst fines below a predetermined value.
4 more elements
A process comprising
- (a) circulating an inventory of cracking catalyst in a catalytic cracking unit comprising a cracking zone and a regeneration zone:
- (b) contacting the cracking catalyst with a hydrocarbon feedstock in the cracking zone to produce a coked cracking catalyst and a cracked product which contains methane and molecular hydrogen and with an oxygen-containing gas in the regeneration zone to produce a regenerated cracking catalyst which is introduced back to the cracking zone and a gaseous effluent stream also containing a concentration of catalyst fines at least a portion of which have a particle size below about 100 microns;
- (c) circulating together with the cracking catalyst a strontium compound in an amount of from about 0.01 to about 1 weight percent, based on the elemental weight of strontium and the total weight of the catalyst inventory, including the strontium compound;
- and
- (d) circulating together with the cracking catalyst an antimony compound in an amount of from about 0.005 to about 0.5 weight percent, based on the elemental weight of antimony and the total weight of the catalyst inventory, including antimony.
2 more elements
Dependencies are inferred from the claim text.