FCC process with improved yield of light olefins
First Claim
1. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, the process comprising contacting said hydrocarbon feed stream with a catalyst having a composition including at least 1.0 wt-% of a zeolite having no greater than medium average pore size and said catalyst including at least 0.1 wt-% coke, said contacting occurring in a single reactor for no more than 2 seconds at a hydrocarbon partial pressure of no more than 172 kPa (25 psia).
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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. The hydrocarbon products including light olefins are separated from the coked catalyst. The first portion of the coked catalyst is passed to a regeneration zone in which coke is combusted from the catalyst to produce a regenerated catalyst. A second portion of the coked catalyst is blended with the regenerated catalyst and introduced to the riser. The regenerated catalyst has substantially the same relative proportions of the first component and the second component as the blended catalyst that contact the hydrocarbon feed stream.
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Citations
20 Claims
- 1. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, the process comprising contacting said hydrocarbon feed stream with a catalyst having a composition including at least 1.0 wt-% of a zeolite having no greater than medium average pore size and said catalyst including at least 0.1 wt-% coke, said contacting occurring in a single reactor for no more than 2 seconds at a hydrocarbon partial pressure of no more than 172 kPa (25 psia).
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9. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, the process comprising:
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contacting said hydrocarbon feed stream with a mixture of coked and regenerated catalyst having a composition including at least 1.0 wt-% of a zeolite having no greater than medium average pore size, said contacting occurring in a single reactor for no more than 2 seconds at a hydrocarbon partial pressure of no more than 172 kPa (25 psia) to obtain coked catalyst; separating hydrocarbon products from said coked catalyst; regenerating a portion of said coked catalyst to obtain regenerated catalyst; passing said regenerated catalyst back to said reactor; and passing another portion of said coked catalyst back to said reactor. - View Dependent Claims (10, 11, 12, 13, 14)
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- 15. A process for fluidized catalytic cracking of a hydrocarbon feed stream to obtain light olefins, the process comprising contacting said hydrocarbon feed stream with a catalyst having a composition including at least 1.0 wt-% of a zeolite having no greater than medium average pore size and said catalyst including at least 0.1 wt-% coke, said contacting occurring in a single reactor for no more than 2 seconds at a hydrocarbon partial pressure of no more than 172 kPa (25 psia) and a ratio of catalyst to feed in the reactor of greater than or equal to 10.
Specification