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Task # 4 A laboratory scale packed bed reactor (PBR) with catalytic particles is used to...

Task # 4

A laboratory scale packed bed reactor (PBR) with catalytic particles is used to make experimentswith an irreversible 1st order gas phase reaction A → product at 500 K. The rate constant forthe reaction, determined by conditions where mass transport resistance could be neglected, is found to k '= 7E15 exp (-18000 / T) m3 / (kgcat s). The particles are spherical with a diameter of D = 2 mm and onedensity of 1200 kg / m3.

4.1

If the effective diffusion coefficient is estimated at 10-6 m2 / s, calculate the efficiency factor ƞ. thereis disregarded for gas film resistance.

4.2

The product formed by the reaction condenses immediately and is thus not present in itthe gas phase. How much catalyst mass W must be used in PBR to achieve a conversion rateX of A of 75% if the feed flow consists of 50% A and 50% inert I and the volume flow is 0.01 m3 / s?

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