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1. (WO1998050495) COMBINATION GAS DISENGAGING DOWNCOMER-REJUVENATION TUBE FOR IN-SITU SLURRY CATALYST REJUVENATION

Pub. No.:    WO/1998/050495    International Application No.:    PCT/US1998/009144
Publication Date: Fri Nov 13 00:59:59 CET 1998 International Filing Date: Wed May 06 01:59:59 CEST 1998
IPC: B01J 8/22
B01J 8/34
B01J 38/48
B01J 38/58
C07C 1/06
Applicants: EXXON RESEARCH AND ENGINEERING COMPANY
Inventors: CHANG, Min
COULALOGLOU, Constantine, A.
HSU, Edward, C.
Title: COMBINATION GAS DISENGAGING DOWNCOMER-REJUVENATION TUBE FOR IN-SITU SLURRY CATALYST REJUVENATION
Abstract:
A reversibly deactivated, particulate catalyst in a hydrocarbon synthesis slurry is rejuvenated by circulating the slurry from a slurry body through (i) a gas disengaging zone to remove gas bubbles from the slurry and increase its density, (ii) a downcomer which feeds the gas reduced, dense slurry into the bottom of a rejuvenating tube and applies a positive hydrostatic pressure to the tube, (iii) a catalyst rejuvenation zone in which a catalyst rejuvenating gas, which also acts as a lift gas, contacts the catalyst in slurry to form a catalyst rejuvenated slurry and, (iv) back into the slurry body. Removing gas bubbles prior to rejuvenation improves the rejuvenation efficiency and the downcomer reduces the amount of rejuvenation gas required to maintain slurry circulation through the tube.