C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
C10G 11/18 (2006.01) B01J 8/18 (2006.01)
Patent
CA 2063584
2063584 9100899 PCTABS00003 A novel catalyst stripper unit and a catalyst stripping process for catalytic hydrocarbon cracking operations are described. The stripper comprises a stripper vessel (60) containing stacked, vertically separated, perforated trays (63), each having an overflow weir (65) defining the maximum depth of a layer of catalyst particles thereon. Each weir (65) forms the top end of a respective downcomer tube (66) which delivers catalyst particles from one tray to the tray immediately beneath at a location which is diametrically opposite the weir (65) of that tray so that particles must pass across the tray before overflowing the weir and descending to the next lower tray. Steam (or another stripping medium) is passed (72) into the bottom of the stripper vessel (60) and rises via the perforations in the trays and via the layers of fluidized particles of catalyst maintained thereon by the weirs (65), thereby stripping hydrocarbon materials from the catalyst particles. The steam containing stripped hydrocarbon materials may be received above the stripper vessel in a separator (12) forming part of the catalytic cracker reactor, and stripped catalyst particles are recovered from the base of the stripper vessel.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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