The Production of p-Anisidine

The reaction scheme is shown in Fig. 3.23. In contrast to the previous example, we will treat the two secondary reactions separately. 

On the assumption of Section 3.2.3.1, namely that there is no accumulation of the reacting A, B, and and that the Tafel-type expression in Eq. (3.146) applies, one obtains a relationship for i, the current density, for the primary reaction  

Assuming (1) the rate of diffusion of B away from the electrode is faster than the rate of the chemical step B - C i.e., as a first approximation the buildup of B in the bulk of the electrolyte is negligibly small (in practice Cg represents 10 to 15% of Cc), and (2) Eq. (3.146) can also be used for ig, the current density of the consecutive secondary reaction, an equation can be derived  

To produce a reaction model we must obtain numerical values for constants H i H (see Section 3.2.2.2). These are determined largely 

From Table 3.8, at low electrode potentials amounts of aniline are very small, i.e., i = i. Hence  

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THE SOLUTION The reaction model for the production of p-anisidine has already been developed in Chapter 3, in Eqs. (3.190), (3.180), and (3.188) (shown again here) ... 

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