Question: Loss of catalyst particles in stack gas (a) Estimate the maximum diameter of micro spherical catalyst particles that could be lost in the stack gas

Loss of catalyst particles in stack gas

(a) Estimate the maximum diameter of micro spherical catalyst particles that could be lost in the stack gas of a fluid cracking unit under the following conditions:

Gas velocity at axis of stack = 1.0 ft/s (vertically upward)

Gas viscosity = 0.026 cp

Gas density = 0.045 lb / ft³

Density of a catalyst particle = 1.2 g/cm³

Express the result in microns (1 micron = 10^–6 = 1/μm).

(b) Is it permissible to use Stokes' law in (a)?

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