Treatment of spent cracking catalysts
AssigneePhillips Petroleum Company
InventorsChia-Min Fu, Michael K. Maholland
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Abstract
A process for reactivating a spent, metal-contaminated zeolite-containing cracking catalyst composition comprises the sequential steps of contacting the catalyst composition with dissolved ammonium compound (preferably NH.sub.4 NO.sub.3), contacting with a fluorine compound (preferably NH.sub.4 F), and treatment with a passivating agent (preferably Mg, Ca, B, A, P and/or Sb). The reactivated cracking catalyst obtained by this reactivation process is employed in a catalytic cracking process.
Claims41
A process for reactivating a spent zeolite-containing cracking catalyst composition comprising the steps of:
- (a) contacting a spent zeolite-containing catalytic cracking catalyst composition, which contains at least one metal contaminant, with a solution of an ammonium compound other than ammonium fluoride, under such conditions as to enhance the catalytic cracking activity of said catalyst composition;
- (b) at least partially separating the catalyst composition having enhanced catalytic cracking activity obtained in step (a) from said solution used in step (a);
- (c) contacting the at least partially separated cracking catalyst composition having undergone steps (a) and (b) with at least one fluorine compound selected from the group consisting of NH.sub.4 F, NH.sub.4 HF.sub.2 and HF, under such conditions as to enhance the catalytic cracking activity of the catalyst composition having undergone steps (a) and (b);
- and
- (d) treating the reactivated catalyst composition obtained in step (c) with at least one metals passivating agent selected from the group consisting of compounds of beryllium, magnesium, calcium, strontium, barium, boron, aluminum, antimony, and phosphorus, under such conditions as to reduce hydrogen generation caused by said at least one metal contaminant during catalytic cracking.
A cracking process comprising the step of contacting a hydrocarbon-containing feed stream with a zeolite-containing cracking catalyst composition, under such cracking conditions as to obtain at least one normally liquid hydrocarbon-containing product stream having a lower initial boiling point and higher API gravity than said hydrocarbon-containing feed stream;
- wherein at least a portion of said cracking catalyst composition is a reactivated spent catalyst composition having undergone a reactivation process comprising the steps of:
- (a) contacting a spent zeolite-containing cracking catalyst composition which contains at least one metal contaminant with a solution of an ammonium compound other than ammonium fluoride, under such contacting conditions as to enhance the cracking activity of said cracking catalyst composition;
- (b) at least partially separating the cracking catalyst composition having enhanced cracking activity obtained in step (a) from said solution used in step (a);
- (c) contacting the at least partially separated cracking catalyst composition having undergone steps (a) and (b) with at least one fluorine compound selected from the group consisting of NH.sub.4 F, NH.sub.4 HF.sub.2 and HF, under such conditions as to enhance the catalyst cracking activity of the catalyst composition having undergone steps (a) and (b);
- and
- (d) treating the reactivated catalyst composition obtained in step (c) with at least one metals passivating agent selected from the group consisting of compounds of beryllium, magnesium, calcium, strontium, barium, boron, aluminum, antimony, and phosphorus, under such conditions as to reduce hydrogen generation caused by said at least one metal contaminant during catalytic cracking.
Dependencies are inferred from the claim text.