FCC process with improved yield of light olefins
First Claim
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1. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, said process comprising:
- contacting the hydrocarbon feed stream with a blended catalyst comprising regenerated catalyst and coked catalyst, said catalyst having a catalyst composition including a first component comprising a large pore molecular sieve and a second component comprising a zeolite with no greater than medium pore size, said zeolite with no greater than medium pore size comprising at least 1.0 wt-% of the catalyst composition, said contacting occurring in a riser to crack hydrocarbons in said feed stream and obtain a cracked stream containing hydrocarbon products including light olefins and coked catalyst;
passing said cracked stream out of an end of said riser such that said hydrocarbon feed stream is in contact with the blended catalyst in the riser for less than or equal to 2 seconds on average;
separating said hydrocarbon products including light olefins from said coked catalyst;
passing a first portion of said coked catalyst to a regeneration zone and combusting coke from said catalyst to produce regenerated catalyst, said regenerated catalyst having substantially the same relative proportions of the first component and the second component as the blended catalyst that contacts the hydrocarbon feed stream;
blending a second portion of said coked catalyst with said regenerated catalyst to make the blended catalyst; and
introducing said blended catalyst to said riser.
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Abstract
An FCC process for obtaining light olefins comprises contacting a hydrocarbon feed stream with blended catalyst comprising regenerated catalyst and coked catalyst. The catalyst has a composition including a first component and a second component. The second component comprises a zeolite with no greater than medium pore size wherein the zeolite comprises at least 1 wt-% of the catalyst composition. The contacting occurs in a riser to crack hydrocarbons in the feed stream and obtain a cracked stream containing hydrocarbon products including light olefins and coked catalyst. The cracked stream is passed out of an end of the riser such that the hydrocarbon feed stream is in contact with the blended catalyst in the riser for less than or equal to 2 seconds on average.
187 Citations
17 Claims
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1. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, said process comprising:
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contacting the hydrocarbon feed stream with a blended catalyst comprising regenerated catalyst and coked catalyst, said catalyst having a catalyst composition including a first component comprising a large pore molecular sieve and a second component comprising a zeolite with no greater than medium pore size, said zeolite with no greater than medium pore size comprising at least 1.0 wt-% of the catalyst composition, said contacting occurring in a riser to crack hydrocarbons in said feed stream and obtain a cracked stream containing hydrocarbon products including light olefins and coked catalyst;
passing said cracked stream out of an end of said riser such that said hydrocarbon feed stream is in contact with the blended catalyst in the riser for less than or equal to 2 seconds on average;
separating said hydrocarbon products including light olefins from said coked catalyst;
passing a first portion of said coked catalyst to a regeneration zone and combusting coke from said catalyst to produce regenerated catalyst, said regenerated catalyst having substantially the same relative proportions of the first component and the second component as the blended catalyst that contacts the hydrocarbon feed stream;
blending a second portion of said coked catalyst with said regenerated catalyst to make the blended catalyst; and
introducing said blended catalyst to said riser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, said process comprising:
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contacting the hydrocarbon feed stream with a blended catalyst at an initial temperature of 621°
to 677°
C. (1150°
to 1250°
F.) in a riser to crack hydrocarbons in said feed stream and obtain a cracked stream containing hydrocarbon products including light olefins and coked catalyst, said blended catalyst comprising regenerated catalyst and coked catalyst, said catalyst having a catalyst composition including a first component comprising a large pore zeolite and/or an active amorphous material and a second component comprising a molecular sieve with no greater than medium average pore size;
passing said cracked stream out of said riser at a temperature of 538°
to 593 °
C. (1000°
to 1100°
F.) such that said hydrocarbon feed stream is in contact with the blended catalyst in the riser for less than 2 seconds on average;
separating said hydrocarbon products including light olefins from said coked catalyst;
passing a first portion of said coked catalyst to a regeneration zone and combusting coke from said catalyst to produce regenerated catalyst, said regenerated catalyst having substantially the same relative proportions of the first catalyst component and the second catalyst component as the blended catalyst that contacts the hydrocarbon feed stream;
blending a second portion of said coked catalyst with said regenerated catalyst; and
introducing said blended catalyst to said reactor conduit. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification
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Current AssigneeUOP Llc (Honeywell International Inc.)
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Original AssigneeUOP Llc (Honeywell International Inc.)
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InventorsUpson, Lawrence L., Pittman, Rusty M.
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Primary Examiner(s)Dang, Thuan D.
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Application NumberUS09/711,576Time in Patent Office862 DaysField of Search585/648, 585/644, 585/650, 585/651, 585/653, 208/118, 208/114, 208/120.1US Class Current585/653CPC Class CodesC07C 4/06 Catalytic processes C07C4/0...C10G 11/05 Crystalline alumino-silicat...C10G 11/18 according to the "fluidised...
