Rate constant, reaction fust-order

First order kinetics in B As in the previous case, the gas phase is composed of a pure component A (CAG is constant) and the liquid phase is considered to be saturated with A (C is constant). However, in this case, the intrinsic rate is considered to be of first order with respect to B -rm = kmC3S, per unit mass of catalyst. Under these conditions, the same analysis is valid for reactions of first order for both components, if CBL is very low, i.e. the reaction rate is pseudo-fust order in respect to B (Smith, 1981). Furthermore, the analysis is valid for reactions of the type (Wu, 1996)... 

The reaction is of fust order in both hydrogen and the organic. However, if the liquid is pure organic and its conversion low, we can assume that its concentration is constant and the reaction rate becomes first order in hydrogen. The gas feed is a mixture of hydrogen and inerts. 

In this case, tlie material balance of B is not needed, liie same solution holds for the case of a fust-order reaction rate with respect to A without the assumption of constant liquid concentration of B. 

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