C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/147
C10G 35/04 (2006.01) C10G 35/12 (2006.01)
Patent
CA 1168177
"MULTIPLE STAGE HYDROCARBON CONVERSION WITH GRAVITY FLOWING CATALYST PARTICLES" ABSTRACT A multiple stage catalytic conversion system in which a hy- drocarbonaceous charge stock and hydrogen flow serially through a plurality of catalytic reaction zones, in each of which the catalyst particles are downwardly movable via gravity flow. At least four reaction zones are utilized, with the fresh feed and hydrogen reac- tant stream being split between the first and second reaction zones. The flow of that portion introduced into the second zone is restric- ted. The effluent stream from the first reaction zone is also re- stricted and then combined with the effluent from the second reac- tion zone. One portion of the combined effluent streams is intro- duced into the third reaction zone, and the remaining portion is re- stricted in flow, combined with the effluent stream from said third reaction zone, and introduced into the fourth reaction zone. This technique decreases the mass flow to the first three zones and in- creases the pressure drop experienced within the entire conversion system, thus serving to alleviate the problems associated with the occurrence of stagnant catalyst areas as a result of catalyst parti- cles being "pinned" within a reaction zone and thus unable to assume a downward, gravity flow 'pattern. Restriction of the second zone feed and first reaction zone effluent insures a higher pressure in the first zone.
394407
Macrae & Co.
Uop Inc.
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