Example 2 Reactant Dosing with Membranes Distributor

Example 2 Reactant Dosing with Membranes ( Distributor ) 

In the field of chemical reaction engineering considerable efforts are devoted to tackling the problem of limited selectivities with which intermediates can be produced in coupled parallel-series reactions. Typical and important examples are partial oxidations where the formation of undesired side products or total oxidation products significantly reduces process efficiencies. Despite the progress achieved in the field of catalysis, many important industrial reactions still suffer from not satisfying conversion-selectivity relationships [52], 

To answer the question whether a certain dosing strategy is useful requires a detailed knowledge of how the reaction rates depend upon the concentrations. It may therefore be instructive to consider (as in Section 12.2.3) a simple scheme for a desired reaction and an undesired consecutive reaction  

If the rates of these two equations are described by power laws based on the 

Equation (46) reveals that an improved selectivity So can be achieved if  

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