An experimental study of the effect of turbulent mixing on the selectivity of competing reactions

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<jats:title>Abstract</jats:title><jats:p>An experimental study of the effect of turbulent mixing on the selectivity of a parallel‐consecutive reaction system (<jats:italic>A</jats:italic> + <jats:italic>B</jats:italic> → <jats:italic>R</jats:italic>; <jats:italic>R</jats:italic> + <jats:italic>B</jats:italic> → <jats:italic>S</jats:italic>) has been carried out in an unmixed feedstream (multijet) tubular reactor. Fluid mechanical characterization of the reactor by pulsed ultrasound Doppler velocimetry reveals that the mean and rms velocity fields are nearly constant over eight‐ninths of the reactor length. Axial profiles of mean product concentration (<jats:italic>R</jats:italic> and <jats:italic>S</jats:italic>) have been measured spectro‐photometrically with a fiber‐optic probe under constant hydrodynamic conditions but with variable feed concentration conditions. The concentration profiles (particularly the <jats:italic>S</jats:italic> profile) show very large deviations from the perfect mixing (classical plug flow reactor) limit. These data provide a good basis for discriminating among the many models of mixing and reaction available in the literature. This is demonstrated with two examples: the four‐environment model, which fits the data well, and the interaction by exchange with the mean model, which does not.</jats:p>

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