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Mixing and fast chemical reaction-V: Influence of diffusion within the reaction zone on selectivity

✍ Scribed by W. Angst; J.R. Bourne; R.N. Sharma

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
407 KB
Volume
37
Category
Article
ISSN
0009-2509

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✦ Synopsis

The competitive, consecutive reations A + B = J?, R + B = S are considered to occur within spherical or planar zones, initially containing only the reagent B and into which the reagent A diffuses. Depending upon whether B is immobile or can diffuse within the reaction zone, so will different distributions of the products R and S be obtained. These distributions have been computed by numerically integrating the diffusion-reaction equations. When B diffuses, less S is formed and increasing the volume ratio a = V*/Vs of the reagent solutions also causes less S to be formed, provided that the mixing modulus is constant. The latter trend has been confirmed by conducting the coupling of I-naphthol (A) and diazotised sulphanilic acid (B) at 01= 10, 50 and 100. The product distributions were predicted well without fitting any constants by a model postulating a gradually thinning, planar reaction zone within which also B diffused.

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