US4743358A — Method for suppressing the harmful effects of met…

Claim 1

Independent Claim 189 words

In a catalytic hydrocarbon conversion process in which a hydrocarbon feedstock having an average boiling temperature above 316° C. and containing one or more metal contaminants is contacted with a conversion catalyst in a reaction zone at a temperature between about 450° C. and about 600° C. wherein at least a portion of said feedstock is converted to lower boiling hydrocarbon products and coke contaminated catalyst is formed on which at least a portion of said metal contaminants has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas thereby forming a regenerated catalyst, and wherein a non-colloidal strontium compound is introduced into said process to react with and suppress the deleterious effects of said metal contaminants on said regenerated catalyst, the improvement which comprises introducing into said process a strontium colloid system comprising a strontium compound in an amount sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium compound had been introduced as a non-colloidal strontium compound.

Claim 2

Dependent Claim 189 words

In a catalytic hydrocarbon conversion process in which a hydrocarbon feedstock having an average boiling temperature above 316° C. and containing one or more metal contaminants is contacted with a conversion catalyst in a reaction zone at a temperature between about 450° C. and about 600° C. wherein at least a portion of said feedstock is converted to lower boiling hydrocarbon products and coke contaminated catalyst is formed on which at least a portion of said metal contaminants has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas thereby forming a regenerated catalyst, and wherein a non-colloidal strontium compound is introduced into said process to react with and suppress the deleterious effects of said metal contaminants on said regenerated catalyst, the improvement which comprises introducing into said process a strontium colloid system comprising a strontium compound in an amount sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium compound had been introduced as a non-colloidal strontium compound.

Claim 3

Dependent Claim 15 words

The process of claim 1 wherein said metal contaminants are vanadium, nickel or mixtures thereof.

Claim 4

Dependent Claim 11 words

The process of claim 1 wherein said metal contaminant comprises vanadium.

Claim 5

Dependent Claim 25 words

The process of claim 2 or 3 wherein said colloid system is introduced into said process with at least a portion of said hydrocarbon feedstock.

Claim 6

Dependent Claim 37 words

The process of claim 2 or 3 wherein said strontium colloid system comprises a strontium compound in an amount such that the atomic ratio of strontium-to-vanadium maintained on the catalyst during said process is at least one.

Claim 7

Dependent Claim 42 words

The process of claim 1 wherein said colloid system comprises (1) a strontium compound in an amount up to about 20%, (2) surfactant ranging from about 20% to about 50%, and a hydrocarbon carrier, based on weight percent of the colloid system.

Claim 8

Dependent Claim 12 words

The process of claim 1 wherein said conversion catalyst contains a zeolite.

Claim 9

Dependent Claim 16 words

The process of claim 1 wherein said hydrocarbon conversion process is a catalytic fluid coking process.

Claim 10

Dependent Claim 13 words

The process of claim 1 wherein said strontium colloid system comprises strontium carbonate.

Claim 11

Dependent Claim 163 words

In a fluid catalytic cracking process in which a hydrocarbon feedstock containing one or more metal contaminants is contacted with a zeolite-containing cracking catalyst in a reaction zone under cracking conditions to form liquid hydrocarbon products and coke contaminated catalyst on which at least a portion of said metal contaminants has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas so as to form a regenerated catalyst, and wherein a non-colloidal strontium compound is introduced into said process to react with and suppress the deleterious effects of said metal contaminants on said regenerated catalyst, the improvement which comprises introducing into said process a strontium colloid system comprising a strontium compound in an amount sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium compound had been introduced as a non-colloidal strontium compound.

Claim 12

Dependent Claim 163 words

In a fluid catalytic cracking process in which a hydrocarbon feedstock containing one or more metal contaminants is contacted with a zeolite-containing cracking catalyst in a reaction zone under cracking conditions to form liquid hydrocarbon products and coke contaminated catalyst on which at least a portion of said metal contaminants has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas so as to form a regenerated catalyst, and wherein a non-colloidal strontium compound is introduced into said process to react with and suppress the deleterious effects of said metal contaminants on said regenerated catalyst, the improvement which comprises introducing into said process a strontium colloid system comprising a strontium compound in an amount sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium compound had been introduced as a non-colloidal strontium compound.

Claim 13

Dependent Claim 15 words

The process of claim 10 wherein said metal contaminants are vanadium, nickel or mixtures thereof.

Claim 14

Dependent Claim 11 words

The process of claim 10 wherein said metal contaminant comprises vanadium.

Claim 15

Dependent Claim 25 words

The process of claim 11 or 12 wherein said colloid system is introduced into said process with at least a portion of said hydrocarbon feedstock.

Claim 16

Dependent Claim 18 words

The process of claim 13 wherein said colloid system is introduced into the reaction zone of said process.

Claim 17

Dependent Claim 40 words

The process of claim 11 or 12 wherein said strontium colloid system comprises a strontium compound in an amount such that the atomic ratio of strontium-to-vanadium maintained on the catalyst during said process is between about 3 and about 10.

Claim 18

Dependent Claim 44 words

The process of claim 10 wherein said colloid system comprises (1) a strontium compound in an amount from about 1% to about 20%, (2) surfactant ranging from about 20% to about 50%, and a hydrocarbon carrier, based upon weight percent of the colloid system.

Claim 19

Dependent Claim 18 words

The process of claim 10 or 12 wherein said hydrocarbon feedstock contains at least 10 wppm metal contaminants.

Claim 20

Dependent Claim 13 words

The process of claim 10 wherein said strontium colloid system comprises strontium carbonate.

Claim 21

Dependent Claim 166 words

In a fluid catalytic cracking process in which a hydrocarbon feedstock containing vanadium is contacted with a zeolite-containing cracking catalyst in a reaction zone under cracking conditions to form liquid hydrocarbon products and coke contaminated catalyst on which at least a portion of said vanadium has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas thereby forming a regenerated catalyst, and wherein non-colloid strontium carbonate is introduced into said process to react with and suppress the deleterious effects of vanadium on said regenerated catalyst, the improvement which comprises introducing into said reaction zone a colloid system comprising strontium carbonate in mixture with at least a portion of said hydrocarbon feedstock, the amount of said strontium carbonate being sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium carbonate had been introduced as non-colloid strontium carbonate.

Claim 22

Dependent Claim 166 words

In a fluid catalytic cracking process in which a hydrocarbon feedstock containing vanadium is contacted with a zeolite-containing cracking catalyst in a reaction zone under cracking conditions to form liquid hydrocarbon products and coke contaminated catalyst on which at least a portion of said vanadium has been deposited, wherein said coke contaminated catalyst is regenerated in a regeneration zone under regeneration conditions by contact with an oxygen-containing regeneration gas thereby forming a regenerated catalyst, and wherein non-colloid strontium carbonate is introduced into said process to react with and suppress the deleterious effects of vanadium on said regenerated catalyst, the improvement which comprises introducing into said reaction zone a colloid system comprising strontium carbonate in mixture with at least a portion of said hydrocarbon feedstock, the amount of said strontium carbonate being sufficient to obtain enhanced activity maintenance of said regenerated catalyst and increased conversion of said feedstock to liquid hydrocarbon products relative to that obtained if said strontium carbonate had been introduced as non-colloid strontium carbonate.

Claim 23

Dependent Claim 38 words

The process of claim 19 wherein strontium carbonate is present in said colloid system in an amount such that the atomic ratio of strontium-to-vanadium maintained on the catalyst during said process is between about 3 and about 10.

Claim 24

Dependent Claim 43 words

The process of claims 19 or 20 wherein said colloid system comprises strontium carbonate in an amount from about 1% to about 20%, surfactant ranging from about 20% to about 50% and a hydrocarbon carrier, based upon weight percent of the colloid system.

Claim 25

Dependent Claim 17 words

The process of claim 19 or 20 wherein said hydrocarbon feedstock contains at least 10 wppm vanadium.

Claim 26

Dependent Claim 24 words

The process of claim 19 wherein said cracking catalyst is coated with said colloid system prior to use of said catalyst in said process.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-05-10	1991-11-09	1992-05-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-05-10	1995-11-09	1996-05-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-05-10	1999-11-09	2000-05-10	$7700.00	Window Closed / Lapsed

Method for suppressing the harmful effects of metal contaminants on hydrocarbon conversion catalysts using a strontium colloid system

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