Closed reactor FCC system with provisions for surge capacity
First Claim
1. An apparatus for the fluid catalytic cracking of a hydrocarbon feed in a closed cyclone system, said apparatus comprising:
- a riser conversion zone defined by a vertically disposed elongated tubular conduit having an upstream end and a downstream end, wherein the downstream end terminates within a reactor vessel, said riser conversion zone having a suspension of hydrocarbon feed and a catalyst introduced into the upstream end thereof and a mixture of the catalyst and cracked hydrocarbon feed exiting from the downstream end thereof,a primary cyclone connected to said downstream end by a first enclosed conduit, a secondary cyclone connected to said primary cyclone by a second enclosed conduit,a first surge capacity means, located on said first enclosed conduit, for accommodating a sudden increased rate of flow of said mixture within said first enclosed conduit, said first surge capacity means being substantially closed during a normal rate of flow of said mixture within said first enclosed conduit, wherein said first surge capacity means comprises first means for preventing catalyst flow therethrough when said first surge capacity means is substantially closed and second means for allowing a first portion of stripping gas flow therethrough when said first surge capacity means is substantially closed, andmeans defining a catalyst stripping zone for stripping hydrocarbons from catalyst received from said cyclones.
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Accused Products
Abstract
A fluid catalytic cracking (FCC) apparatus and process comprising a reactor riser zone, a primary and a secondary cyclones, connected in series to the riser zone, and a stripping zone. The riser zone, the primary and the secondary cyclones, and the stripping zone, are placed within a single reactor vessel. The primary cyclone is connected to the reactor riser zone by an enclosed conduit which prevents random post-riser thermal cracking of the hydrocarbons after they exit the reactor riser zone. The conduit contains a trickle valve, or other means, to accommodate sudden increased surges of flow of the hydrocarbons and catalyst mixture.
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Citations
14 Claims
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1. An apparatus for the fluid catalytic cracking of a hydrocarbon feed in a closed cyclone system, said apparatus comprising:
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a riser conversion zone defined by a vertically disposed elongated tubular conduit having an upstream end and a downstream end, wherein the downstream end terminates within a reactor vessel, said riser conversion zone having a suspension of hydrocarbon feed and a catalyst introduced into the upstream end thereof and a mixture of the catalyst and cracked hydrocarbon feed exiting from the downstream end thereof, a primary cyclone connected to said downstream end by a first enclosed conduit, a secondary cyclone connected to said primary cyclone by a second enclosed conduit, a first surge capacity means, located on said first enclosed conduit, for accommodating a sudden increased rate of flow of said mixture within said first enclosed conduit, said first surge capacity means being substantially closed during a normal rate of flow of said mixture within said first enclosed conduit, wherein said first surge capacity means comprises first means for preventing catalyst flow therethrough when said first surge capacity means is substantially closed and second means for allowing a first portion of stripping gas flow therethrough when said first surge capacity means is substantially closed, and means defining a catalyst stripping zone for stripping hydrocarbons from catalyst received from said cyclones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for the fluid catalytic cracking of a hydrocarbon feed in a closed cyclone system, said apparatus comprising:
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a riser conversion zone defined by a vertically disposed elongated tubular conduit having an upstream end and a downstream end, said downstream end terminating within a reactor vessel, said riser conversion zone having a suspension of hydrocarbon feed and catalyst introduced into the upstream end thereof and a mixture of the catalyst and cracked hydrocarbon feed exiting from the downstream end thereof, a primary cyclone connected to said downstream end by a first enclosed conduit, a secondary cyclone connected to said primary cyclone by a second enclosed conduit, said first and said second conduits completely separating the material conducted therein from the atmosphere of said reactor vessel, a surge capacity means located on said second enclosed conduit, for accommodating a sudden increased rate of flow of said material within said second enclosed conduit, said second surge capacity means being substantially closed during a normal rate of flow of said material within said second enclosed conduit, and comprising means for preventing catalyst flow therethrough when said surge means is substantially closed and means for allowing stripping gas flow therethrough when said surge means is substantially closed, and means defining a catalyst stripping zone for stripping hydrocarbons from catalyst received from said cyclones.
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Specification