Catalyst withdrawal

Details Catalyst withdrawal Catalyst withdrawal

C - Chemistry, Metallurgy

10

G

196/129

C10G 47/00 (2006.01) B01J 8/00 (2006.01)

Patent

CA 1068229

CATALYST ADDITION AND WITHDRAWAL ABSTRACT OF THE DISCLOSURE In an upflow, ebullated bed reactor using a heterogeneous catalyst, a transport liquid compatible with the catalyst and the reactor feedstock is used. During the addition of fresh catalyst, a heated slurry of catalyst and transport liquid is pumped into the reactor under conditions to minimize (a) the temperature difference between the slurry and the reactor and (b) exposure of the fresh catalyst to a deactivating elevated temperature. During catalyst withdrawal, the temperature of the reactor effluent stream is controlled by mixing with a transport liquid. Measurement and flowability of the resultant mixture is thus assured.

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