Research and Development on FFB Catalyst Regeneration

The following studies on FFB of FCC catalyst have been carried out, some under simulated plant conditions. 

Li et al. (1980) found the superficial velocity of gas and mass flow rate of solid particles at the transition point between turbulent and fast fluidization through a series of test conditions at u = 0.5-1.7 m/s and Gs = 20-670 t/(m2 h), in dt 0.043, 0.081 and 0.495 m beds, and obtained the following 

Equation (3) was confirmed by RIPP in hot simulation tests in a d, 0.081 m vessel. Further experiments were conducted by LPEC in a d, 1.2 m vessel in a semicommercial FCCU, yielding the following conclusions  

Average bed density decreases slightly as pressure increases (Fig. 4). 

Solid mass velocity should increase with u in order to keep p constant (Table II). 

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