Page 135 - Fluid Catalytic Cracking Handbook

110 Fluid Catalytic Cracking Handbook

9000

8000

2000

0 0.05 0,1 0.15 0.2 0.2S 0.3 0.35 0.4 0.45 0.5 O.S5 0.6 0.66 07
Catalyst Additions, Ib/bbl
Figure 3-14. Catalyst metals content versus catalyst addition rate for 22°API
Gravity Feed. (Source: Katalystics' Regional Technology Seminar, New Orleans,
Louisiana, December 15, 1998.)

catalyst activity. The daily makeup rate is typically 1% to 2% of
inventory or 0.1 to 0.3 pounds (0.045 to 0.14 kg) of catalyst per barrel
of fresh feed. In cases where the makeup rate for activity maintenance
exceeds catalyst losses, part of the inventory is periodically withdrawn