Higher containment VSS with multi zone stripping
AssigneeMarathon Petroleum Company LP
InventorDavid Lomas
Life of this patent
Estimating the term…
Abstract
This patent application discloses engineering design modifications to the VSS exit, stripper entrance and the primary cyclone diplegs that can significantly reduce the underflow of reactor riser products into the stripper and reactor vessel and thereby produce higher desired product selectivities, improved stripping efficiency and a stripper vent gas, that continuously flows through the reactor vessel, with a low coke forming potential due to its low concentration of ethylene and higher molecular weight material, that could, if desired, be recovered separately from the primary riser products.
Claims32
An improved vortex separation system comprising:
- a VSS separation chamber;
- a stripper zone;
- at least one vent pipe wherein stripper vapers exit the system;
- a baffle located between the stripper zone and the VSS separation chamber,
- wherein the baffle is an inverted V-shape having distal ends extended beyond the VSS separation chamber to increase stripper vapor diversion around the VSS separation chamber.
An improved vortex separation system that generates significantly higher plug flow containment of primary riser products due to reduced back mixing within the chamber and a lower final vapor product underflow within a catalyst void that comprises of:
- a VSS separation chamber;
- a baffle located between an original stripping zone 23 and the VSS separation chamber, creating a three-zone stripping section having stripping zones 31, 33, and 23;
- wherein the baffle is configured to direct stripper vapors 8, exiting zones 23 and 33, away from the VSS separation chamber;
- and
- wherein the stripper vapors from zones 23 and 33 rise through zones 23 and 33, bypassing the VSS chamber and exit the reactor vessel via an at least on vent pipe 7 into a VSS riser.
An improved vortex separation system comprising:
- a VSS separation chamber;
- a stripper zone;
- and
- a cyclone separator having a dipleg wherein the circumference of the dipleg is expanded such that the flowing catalyst flux lb/ft2/sec in the dipleg is reduced to produce a flowing velocity less than the bubble rise velocity.
An improved vortex separation system comprising:
- a VSS separation chamber;
- a stripper zone;
- at least one vent pipe wherein stripper vapers exit the system
- a baffle configured to divert vapor from the stripper chamber away from the VSS separation chamber;
- and
- a cyclone separator having a dipleg where in the circumference of the dipleg is, configured such that the flowing catalyst flux lb/ft2/sec in the dipleg is reduced to produce a flowing velocity less than the bubble rise velocity.
An improved vortex separation system comprising:
- a reactor vessel having a bottom section;
- a VSS chamber within the reactor vessel;
- a stripping chamber with the bottom section of the reactor vessel
- a baffle 35 that segregates the stripping chamber into three separate stripping zones, a cracked gas stripping zone 31, a transition zone 33, and a main stripper 23.
A cyclone separator comprising:
- a cyclone separator;
- and
- a dipleg wherein the circumference of the dipleg is expanded such that the flowing catalyst flux lb/ft2/sec in the dipleg is reduced to produce a flowing velocity less than the bubble rise velocity.
An improved crossflow vortex separation system comprising:
- a chamber 27;
- a baffle 41 that segregates a stripper into three zones 31, 33 and 23;
- a VSS separation chamber 1 having at least one outer wall;
- and
- at least one deflection shield 43 engaged with at least one outer wall and angularly disposed with the at least one outer wall, the defection shield acting to deflect catalyst falling through the VSS separation chamber 1 toward the center of the VSS separation chamber.
An improved vortex separation system comprising:
- a chamber 27;
- a baffle that segregates the stripping chamber into three separate stripping zones, a cracked gas stripping zone 31, a transition zone 33, and a main stripper 23;
- a VSS separation chamber 1 having at least one outer wall;
- and
- wherein as catalyst falls from the VSS chamber 1, the baffle directs the falling catalyst into the cracked gas stripping zone 31, which is then directed into the transition zone 33, before entering the main stripper 23.
The improved vortex separation system of 22 wherein the three stripping zones increase the residence time of the falling catalyst in the cracked gas stripping zone 31 and the transition zone 33.
An improved vortex separation system having multiple stripping zones comprising:
- a reactor vessel;
- a VSS separation chamber located within the reactor vessel;
- a stripping chamber located beneath the VSS separation chamber in the bottom of the reactor vessel;
- a baffle located between the stripping chamber and the VSS separation chamber creating multiple stripping zones 31, 33, and 23;
- and
- wherein the baffle is configured to direct stripper vapors exiting stripping zones 23 and 33 away from the VSS separation chamber.
Dependencies are inferred from the claim text.