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EP0063901A1
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EP
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Fluid catalytic cracking process and apparatus
Assignee: Mobil Oil AS
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Filing: 1982-04-16
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Granted: —
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Expires: 2002-04-16
Abstract
Abstract An acceleration zone (A) in the "Y" section of the riser (at the point of contact of regenerated catalyst and oil feed) in the FCC reactor increases initial superficial velocity of vaporized hydrocarbons to 7.6 to 24.4 m per second to reduce catalyst backmixing. The acceleration zone is followed by a transition zone (T) comprising an expanding riser section, which con-. nects the acceleration zone to the remainder of the riser.
Inventors
- 👤 Klaus Wilhelm Schatz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:56
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; B; B01; B01J; B01J8/00; B01J8/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A fluid catalytic cracking process which comprises mixing a hydrocarbon feed with a regenerated catalyst in the bottom section of a reactor riser, passing the mixture of hydrocarbon feed and catalyst through the riser to effect cracking of the hydrocarbon feed at the process temperature under endothermic process conditions and deactivate the catalyst by deposition of carbonaceous deposits thereon, separating the deactivated catalyst from the cracked hydrocarbon feed, passing the deactivated catalyst to a regenerator vessel in which the carbonaceous deposits are removed from the deactivated catalyst under exothermic process conditions by means of a regenerating medium introduced into the regenerator vessel, and passing the regenerated hot catalyst to the bottom section of the reactor riser, characterized in that the mixture of hydrocarbon feed and catalyst initially passes in the reactor riser through an acceleration zone constituting the first 6.1 to 7.6 m of the reactor riser length, the vaporized hydrocarbon feed being accelerated therein to a superficial velocity of from 7.6 to 24.4 m per second.
Claim 2
Dependent Claim
167 words
A fluid catalytic cracking process which comprises mixing a hydrocarbon feed with a regenerated catalyst in the bottom section of a reactor riser, passing the mixture of hydrocarbon feed and catalyst through the riser to effect cracking of the hydrocarbon feed at the process temperature under endothermic process conditions and deactivate the catalyst by deposition of carbonaceous deposits thereon, separating the deactivated catalyst from the cracked hydrocarbon feed, passing the deactivated catalyst to a regenerator vessel in which the carbonaceous deposits are removed from the deactivated catalyst under exothermic process conditions by means of a regenerating medium introduced into the regenerator vessel, and passing the regenerated hot catalyst to the bottom section of the reactor riser, characterized in that the mixture of hydrocarbon feed and catalyst initially passes in the reactor riser through an acceleration zone constituting the first 6.1 to 7.6 m of the reactor riser length, the vaporized hydrocarbon feed being accelerated therein to a superficial velocity of from 7.6 to 24.4 m per second.
Claim 3
Dependent Claim
80 words
A process according to claim 1 wherein, after passing through the acceleration zone, the mixture passes through a transition zone in the riser, the transition zone having a progressively larger diameter than the acceleration zone, the diameter increasing at an angle of not more than 9 degrees, the transition zone connecting the acceleration zone with the remainder of the riser, the linear velocity of the catalyst in the transition zone thereby not exceeding the linear velocity of the hydrocarbon vapors.
Claim 4
Dependent Claim
25 words
A process according to claim 2, wherein the expansion. angle of the portion of the riser forming the transition zone is 5 to 9 degrees.
Claim 5
Dependent Claim
31 words
A process according to any one of claims 1 to 3, wherein the superficial velocity of the vaporized hydrocarbon feed in the acceleration zone is 7.6 to 15.25 m per second.
Claim 6
Dependent Claim
98 words
A fluid catalytic cracking apparatus comprising in combination a reactor vessel and a regenerator vessel, the reactor vessel comprising a reactor riser and a gas-solid separator, means for conveying a deactivated catalyst from the reactor vessel to the regenerator vessel, and means for conveying regenerated catalyst from the regenerator vessel to the reactor vessel, characterized in that the first 6.1 to 7.6 m of the reactor riser length is an acceleration zone having a cross-sectional area such that, in use a hydrocarbon feed is accelerated therein to a superficial velocity of from 7.6 to 24.4 m per second.
Claim 7
Dependent Claim
98 words
A fluid catalytic cracking apparatus comprising in combination a reactor vessel and a regenerator vessel, the reactor vessel comprising a reactor riser and a gas-solid separator, means for conveying a deactivated catalyst from the reactor vessel to the regenerator vessel, and means for conveying regenerated catalyst from the regenerator vessel to the reactor vessel, characterized in that the first 6.1 to 7.6 m of the reactor riser length is an acceleration zone having a cross-sectional area such that, in use a hydrocarbon feed is accelerated therein to a superficial velocity of from 7.6 to 24.4 m per second.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 5, wherein the acceleration zone is followed by a transition zone having a progressively larger diameter than the acceleration zone, the diameter increasing at an angle of not more than 9 degrees.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 6 wherein the angle of increase of the diameter of the transition zone is 5 to 9 degrees.
References Cited (Backward Citations)
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